{"id":1055316,"date":"2026-08-18T16:53:44","date_gmt":"2026-08-18T08:53:44","guid":{"rendered":"https:\/\/vimaterial.de\/?p=1055316"},"modified":"2026-08-18T16:58:36","modified_gmt":"2026-08-18T08:58:36","slug":"niobium-boride-grain-refinement-aluminum-alloys","status":"publish","type":"post","link":"https:\/\/vimaterial.de\/en\/niobium-boride-grain-refinement-aluminum-alloys\/","title":{"rendered":"Niobium boride (NbB\u2082) for Grain Refinement of Aluminum Alloys: Mechanism, Advantages and Selection Guide"},"content":{"rendered":"\t\t<div data-elementor-type=\"wp-post\" data-elementor-id=\"1055316\" class=\"elementor elementor-1055316\" data-elementor-post-type=\"post\">\n\t\t\t\t<div class=\"elementor-element elementor-element-f667541 e-flex e-con-boxed e-con e-parent\" data-id=\"f667541\" data-element_type=\"container\" data-e-type=\"container\">\n\t\t\t\t\t<div class=\"e-con-inner\">\n\t\t\t\t<div class=\"elementor-element elementor-element-9ac63ae elementor-widget elementor-widget-text-editor\" data-id=\"9ac63ae\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t<p><strong><span style=\"color: #0000ff;\"><a style=\"color: #0000ff;\" href=\"https:\/\/vimaterial.de\/en\/search\/?type=element&amp;keyword=NbB2\">Niobium boride (NbB\u2082)<\/a><\/span><\/strong> is a high-melting-point boride with a hexagonal AlB\u2082-type crystal structure. In aluminum alloy processing, NbB\u2082 can act as an effective heterogeneous nucleation substrate and promote the formation of fine, equiaxed \u03b1-Al grains during solidification.<\/p><p>Its most important advantage is found in <strong>high-silicon Al-Si alloys<\/strong>, where conventional TiB\u2082-based grain refiners may lose effectiveness because of silicon poisoning. NbB\u2082 offers better resistance to this effect, making it a promising grain-refining material for high-silicon casting and die-casting alloys.<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-8fecd4a elementor-widget elementor-widget-heading\" data-id=\"8fecd4a\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"heading.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t<h2 class=\"elementor-heading-title elementor-size-default\">How Does NbB\u2082 Refine Aluminum Grains?<\/h2>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-e43e1df elementor-widget elementor-widget-text-editor\" data-id=\"e43e1df\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t<p>The grain-refining effect of NbB\u2082 mainly involves four mechanisms: heterogeneous nucleation, resistance to silicon poisoning, grain-boundary pinning, and synergy with NbAl\u2083 in Al-Nb-B master alloys.<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-88fc09d elementor-widget elementor-widget-heading\" data-id=\"88fc09d\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"heading.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t<h3 class=\"elementor-heading-title elementor-size-default\">1. Heterogeneous Nucleation of \u03b1-Al<\/h3>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-b952785 elementor-widget elementor-widget-text-editor\" data-id=\"b952785\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t<p>The primary function of niobium boride is to provide active surfaces for the heterogeneous nucleation of \u03b1-Al.<\/p><p>Aluminum has a face-centered cubic crystal structure, while niobium boride has a hexagonal AlB\u2082-type structure. The crystallographic relationship between the <strong>(0001) basal plane of NbB\u2082<\/strong> and the <strong>{111} plane of \u03b1-Al<\/strong> provides favorable conditions for nucleation.<\/p><p>As the aluminum melt approaches its liquidus temperature, aluminum atoms can preferentially arrange themselves on niobium boride particle surfaces, allowing \u03b1-Al nuclei to form with relatively low undercooling.<\/p><p>A well-dispersed population of NbB\u2082 particles can therefore generate a large number of \u03b1-Al nuclei:<\/p><p><strong>More nucleation sites \u2192 more \u03b1-Al nuclei \u2192 reduced grain growth \u2192 finer equiaxed grains<\/strong><\/p><p>Particle size is important. A <strong>D50 of approximately 0.5\u20133 \u03bcm<\/strong> can provide a practical balance between nucleation-site density and dispersion. Larger particles provide fewer potential nucleation sites per unit mass, while very fine nanoparticles can agglomerate and reduce the number of effectively active particles.<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-632d045 elementor-widget elementor-widget-heading\" data-id=\"632d045\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"heading.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t<h3 class=\"elementor-heading-title elementor-size-default\">2. Resistance to Silicon Poisoning<\/h3>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-ba65fb7 elementor-widget elementor-widget-text-editor\" data-id=\"ba65fb7\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t<p>The resistance to silicon poisoning is the key advantage of niobium boride over conventional TiB\u2082-based grain-refining systems.<\/p><p>TiB\u2082 is an effective nucleation substrate and is widely used in Al-Ti-B grain refiners. However, in high-silicon aluminum melts, silicon can interact with active sites on TiB\u2082 surfaces and form a Ti-Si interfacial layer. This can cover or block nucleation sites and reduce the grain-refining efficiency of <span style=\"color: #0000ff;\"><a style=\"color: #0000ff;\" href=\"https:\/\/vimaterial.de\/en\/search\/?type=element&amp;keyword=TiB2\">TiB\u2082<\/a><\/span>.<\/p><p>NbB\u2082 has different interfacial chemistry. The driving force for Nb-Si reactions is lower than that for Ti-Si reactions under relevant aluminum-melt conditions. Silicon is therefore less likely to form a continuous reaction layer on the <strong>NbB\u2082 (0001) basal plane<\/strong>.<\/p><p>As a result, more active nucleation sites can remain available for \u03b1-Al formation in silicon-rich melts.<\/p><p>This makes NbB\u2082 particularly attractive for high-silicon <strong>Al-Si casting and die-casting alloys<\/strong>, including compositions in the range commonly associated with A383- and A413-type alloys.<\/p><p>NbB\u2082 should not be considered completely immune to silicon. Its advantage is its <strong>higher resistance to silicon poisoning compared with TiB\u2082<\/strong>, rather than complete immunity under all conditions.<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-b06ea27 elementor-widget elementor-widget-image\" data-id=\"b06ea27\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"image.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t<img fetchpriority=\"high\" decoding=\"async\" width=\"800\" height=\"449\" src=\"https:\/\/vimaterial.de\/wp-content\/uploads\/2026\/08\/Dissolution-and-diffusion-behavior-of-NbB\u2082-in-aluminum-alloys.png\" class=\"attachment-large size-large wp-image-1055319\" alt=\"Dissolution and diffusion behavior of niobium boride in aluminum alloys - VIMATERIAL\" srcset=\"https:\/\/vimaterial.de\/wp-content\/uploads\/2026\/08\/Dissolution-and-diffusion-behavior-of-NbB\u2082-in-aluminum-alloys.png 890w, https:\/\/vimaterial.de\/wp-content\/uploads\/2026\/08\/Dissolution-and-diffusion-behavior-of-NbB\u2082-in-aluminum-alloys-300x169.png 300w, https:\/\/vimaterial.de\/wp-content\/uploads\/2026\/08\/Dissolution-and-diffusion-behavior-of-NbB\u2082-in-aluminum-alloys-768x431.png 768w, https:\/\/vimaterial.de\/wp-content\/uploads\/2026\/08\/Dissolution-and-diffusion-behavior-of-NbB\u2082-in-aluminum-alloys-600x337.png 600w\" sizes=\"(max-width: 800px) 100vw, 800px\" title=\"\">\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-c2040ef elementor-widget elementor-widget-heading\" data-id=\"c2040ef\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"heading.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t<h3 class=\"elementor-heading-title elementor-size-default\">3. Grain-Boundary Pinning<\/h3>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-d1f7c90 elementor-widget elementor-widget-text-editor\" data-id=\"d1f7c90\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t<p>Niobium boride can also contribute to grain stability after solidification.<\/p><p>Fine niobium boride particles remaining in the aluminum matrix can interact with grain boundaries and produce a <strong><span style=\"color: #0000ff;\"><a style=\"color: #0000ff;\" href=\"https:\/\/en.wikipedia.org\/wiki\/Zener_pinning\" rel=\"nofollow noopener\" target=\"_blank\">Zener pinning<\/a><\/span> effect<\/strong>, which restricts grain-boundary movement and helps suppress grain growth.<\/p><p>This can help:<\/p><ul><li>Maintain a finer grain structure during cooling<\/li><li>Reduce grain coarsening<\/li><li>Improve microstructural stability during subsequent heat treatment<\/li><li>Preserve the benefits of a fine-grained structure at elevated temperatures<\/li><\/ul>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-754fe9d elementor-widget elementor-widget-text-editor\" data-id=\"754fe9d\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t<p>Therefore, niobium boride can contribute both to <strong>grain nucleation during solidification and grain-growth suppression afterward.<\/strong><\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-28ae8fe elementor-widget elementor-widget-heading\" data-id=\"28ae8fe\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"heading.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t<h3 class=\"elementor-heading-title elementor-size-default\">4. Synergy with NbAl\u2083 in Al-Nb-B Master Alloys<\/h3>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-59d7db6 elementor-widget elementor-widget-text-editor\" data-id=\"59d7db6\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t<p>When niobium boride is introduced through an <strong>Al-Nb-B master alloy<\/strong>, the grain-refining effect may involve NbAl\u2083 in addition to NbB\u2082.<\/p><p>NbAl\u2083 can provide additional nucleation sites and contribute to local constitutional undercooling during solidification. It may also interact with the melt chemistry and influence the silicon environment around NbB\u2082 particles.<\/p><p>This creates a potential synergistic effect between NbB\u2082 and NbAl\u2083.<\/p><p>However, this distinction is important when comparing <strong>NbB\u2082 powder with Al-Nb-B master alloys<\/strong>. Direct addition of pure NbB\u2082 powder does not automatically generate the same NbAl\u2083-containing system. Therefore, the two approaches should not be considered completely equivalent.<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-7d9c8b6 elementor-widget elementor-widget-heading\" data-id=\"7d9c8b6\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"heading.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t<h2 class=\"elementor-heading-title elementor-size-default\">Why Is Niobium Boride Attractive for High-Silicon Al-Si Alloys?<\/h2>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-78b74a3 elementor-widget elementor-widget-text-editor\" data-id=\"78b74a3\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t<p>The main difference between NbB\u2082 and TiB\u2082 is not their ability to nucleate \u03b1-Al. Both are hexagonal diborides and can act as heterogeneous nucleation substrates.<\/p><p>The key difference is their behavior in silicon-rich aluminum melts.<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-6a69ea2 elementor-widget elementor-widget-text-editor\" data-id=\"6a69ea2\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t<div style=\"overflow-x: auto; width: 100%;\"><table style=\"width: 100%; border-collapse: collapse; font-size: 15px; line-height: 1.6;\"><thead><tr><th style=\"text-align: left; padding: 12px 14px; border: 1px solid #ddd; font-weight: 600;\">Feature<\/th><th style=\"text-align: left; padding: 12px 14px; border: 1px solid #ddd; font-weight: 600;\">NbB\u2082<\/th><th style=\"text-align: left; padding: 12px 14px; border: 1px solid #ddd; font-weight: 600;\">TiB\u2082<\/th><\/tr><\/thead><tbody><tr><td style=\"padding: 12px 14px; border: 1px solid #ddd;\">Crystal structure<\/td><td style=\"padding: 12px 14px; border: 1px solid #ddd;\">Hexagonal AlB\u2082-type<\/td><td style=\"padding: 12px 14px; border: 1px solid #ddd;\">Hexagonal AlB\u2082-type<\/td><\/tr><tr><td style=\"padding: 12px 14px; border: 1px solid #ddd;\">\u03b1-Al nucleation<\/td><td style=\"padding: 12px 14px; border: 1px solid #ddd;\">Effective<\/td><td style=\"padding: 12px 14px; border: 1px solid #ddd;\">Effective<\/td><\/tr><tr><td style=\"padding: 12px 14px; border: 1px solid #ddd;\">Resistance to Si poisoning<\/td><td style=\"padding: 12px 14px; border: 1px solid #ddd;\">Higher<\/td><td style=\"padding: 12px 14px; border: 1px solid #ddd;\">More susceptible<\/td><\/tr><tr><td style=\"padding: 12px 14px; border: 1px solid #ddd;\">High-Si <span style=\"color: #0000ff;\"><a style=\"color: #0000ff;\" href=\"https:\/\/vimaterial.de\/en\/search\/?type=element&amp;keyword=Al%2CSi\">Al-Si alloys<\/a><\/span><\/td><td style=\"padding: 12px 14px; border: 1px solid #ddd;\">Particularly attractive<\/td><td style=\"padding: 12px 14px; border: 1px solid #ddd;\">Grain-refining efficiency may decrease<\/td><\/tr><tr><td style=\"padding: 12px 14px; border: 1px solid #ddd;\">Low-Si aluminum alloys<\/td><td style=\"padding: 12px 14px; border: 1px solid #ddd;\">Useful, but limited additional advantage<\/td><td style=\"padding: 12px 14px; border: 1px solid #ddd;\">Well-established and economical<\/td><\/tr><tr><td style=\"padding: 12px 14px; border: 1px solid #ddd;\">Grain-boundary pinning<\/td><td style=\"padding: 12px 14px; border: 1px solid #ddd;\">Yes<\/td><td style=\"padding: 12px 14px; border: 1px solid #ddd;\">Yes<\/td><\/tr><\/tbody><\/table><\/div>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-73d75c7 elementor-widget elementor-widget-text-editor\" data-id=\"73d75c7\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t<p>For conventional low-silicon aluminum alloys, TiB\u2082-based grain refiners remain highly competitive. The technical value of NbB\u2082 becomes more significant as the silicon content increases and the risk of TiB\u2082 silicon poisoning becomes more important.<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-a1e307e elementor-widget elementor-widget-heading\" data-id=\"a1e307e\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"heading.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t<h2 class=\"elementor-heading-title elementor-size-default\">Niobium Boride Selection Considerations<\/h2>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-f17523d elementor-widget elementor-widget-text-editor\" data-id=\"f17523d\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t<p>The practical performance of niobium boride depends not only on its nominal chemical composition but also on particle characteristics and melt processing.<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-0cb9593 elementor-widget elementor-widget-heading\" data-id=\"0cb9593\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"heading.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t<h3 class=\"elementor-heading-title elementor-size-default\">Particle Size<\/h3>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-464a00b elementor-widget elementor-widget-text-editor\" data-id=\"464a00b\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t<p>A <strong>D50 of approximately 0.5\u20133 \u03bcm<\/strong> can provide a useful balance between nucleation-site density and dispersion.<\/p><p>Extremely fine particles are not automatically better because agglomeration can reduce their effective nucleation activity.<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-a2e7659 elementor-widget elementor-widget-heading\" data-id=\"a2e7659\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"heading.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t<h3 class=\"elementor-heading-title elementor-size-default\">Chemical and Phase Purity<\/h3>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-bf64191 elementor-widget elementor-widget-text-editor\" data-id=\"bf64191\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t<p>High niobium boride content and controlled secondary phases are important for consistent grain-refining performance. Undesirable phases such as excessive free boron or NbB should be controlled.<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-cf623d6 elementor-widget elementor-widget-heading\" data-id=\"cf623d6\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"heading.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t<h3 class=\"elementor-heading-title elementor-size-default\">Oxygen Content<\/h3>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-63fce25 elementor-widget elementor-widget-text-editor\" data-id=\"63fce25\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t<p>Low oxygen content and limited surface oxidation are important because the niobium boride surface directly participates in heterogeneous nucleation. Significant surface oxidation can reduce the availability of effective nucleation sites.<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-de1fec4 elementor-widget elementor-widget-heading\" data-id=\"de1fec4\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"heading.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t<h3 class=\"elementor-heading-title elementor-size-default\">Dispersion<\/h3>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-2298014 elementor-widget elementor-widget-text-editor\" data-id=\"2298014\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t<p>Good dispersion is essential. A powder with a suitable particle-size distribution but poor dispersion may provide less effective grain refinement than expected.<\/p><p>For this reason, <strong>particle size, purity, oxygen content, phase composition, and dispersion behavior should be evaluated together.<\/strong><\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-67d6bc4 elementor-widget elementor-widget-image\" data-id=\"67d6bc4\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"image.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t<img decoding=\"async\" width=\"750\" height=\"500\" src=\"https:\/\/vimaterial.de\/wp-content\/uploads\/2026\/08\/Niobium-Boride-Powder.jpg\" class=\"attachment-large size-large wp-image-1055320\" alt=\"\" srcset=\"https:\/\/vimaterial.de\/wp-content\/uploads\/2026\/08\/Niobium-Boride-Powder.jpg 750w, https:\/\/vimaterial.de\/wp-content\/uploads\/2026\/08\/Niobium-Boride-Powder-300x200.jpg 300w, https:\/\/vimaterial.de\/wp-content\/uploads\/2026\/08\/Niobium-Boride-Powder-600x400.jpg 600w\" sizes=\"(max-width: 750px) 100vw, 750px\" title=\"\">\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-5fd88e3 elementor-widget elementor-widget-heading\" data-id=\"5fd88e3\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"heading.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t<h2 class=\"elementor-heading-title elementor-size-default\">Processing Limitation: Particle Sedimentation<\/h2>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-5b92549 elementor-widget elementor-widget-text-editor\" data-id=\"5b92549\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t<p>Niobium boride has a density of approximately <strong>6.97 g\/cm\u00b3<\/strong>, considerably higher than aluminum at approximately 2.7 g\/cm\u00b3.<\/p><p>This density difference creates a tendency for niobium boride particles to settle in molten aluminum.<\/p><p>If mixing is insufficient or the holding time is too long, particles may accumulate at the bottom of the crucible. The upper portion of the melt can then contain fewer active nucleation particles, reducing grain-refining efficiency.<\/p><p>Important processing factors include:<\/p><ul><li>Melt stirring and mixing<\/li><li>Particle dispersion<\/li><li>Holding time<\/li><li>Melt temperature<\/li><li>Addition method<\/li><li>Transfer and casting conditions<\/li><\/ul>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-9bcd9fa elementor-widget elementor-widget-text-editor\" data-id=\"9bcd9fa\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t<p>Good dispersion and appropriate melt handling are therefore essential for maintaining a uniform distribution of NbB\u2082.<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-ada06b3 elementor-widget elementor-widget-heading\" data-id=\"ada06b3\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"heading.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t<h2 class=\"elementor-heading-title elementor-size-default\">Effects on Aluminum Alloy Properties<\/h2>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-da5ece2 elementor-widget elementor-widget-text-editor\" data-id=\"da5ece2\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t<p>The main function of niobium boride is grain refinement, while improvements in material properties are mainly related to the resulting fine and uniform microstructure.<\/p><p>Fine grains can contribute to:<\/p><ul><li>Higher yield and tensile strength<\/li><li>Improved ductility<\/li><li>Reduced tendency toward brittle fracture<\/li><li>Better microstructural uniformity<\/li><li>Reduced columnar grain formation<\/li><li>Potentially lower hot-cracking and shrinkage-related defects<\/li><\/ul>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-56637d3 elementor-widget elementor-widget-text-editor\" data-id=\"56637d3\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t<p>The actual effect depends on alloy composition, NbB2 addition level, particle dispersion, cooling conditions, casting process, and subsequent heat treatment.<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-350d131 elementor-widget elementor-widget-heading\" data-id=\"350d131\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"heading.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t<h2 class=\"elementor-heading-title elementor-size-default\">When Is Nionium Boride a Good Choice?<\/h2>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-7a3d803 elementor-widget elementor-widget-text-editor\" data-id=\"7a3d803\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t<p>Niobium boride is particularly attractive when the application involves:<\/p><ul><li>High-silicon Al-Si alloys<\/li><li>Aluminum die-casting alloys<\/li><li>A383- or A413-type alloy compositions<\/li><li>A need for stable grain refinement in silicon-rich melts<\/li><li>Fine and uniform equiaxed grain structures<\/li><li>Reduced sensitivity to TiB\u2082 silicon poisoning<\/li><\/ul>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-d2cc97a elementor-widget elementor-widget-text-editor\" data-id=\"d2cc97a\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t<p>For low-silicon aluminum alloys, the advantage of NbB\u2082 may be less pronounced, and conventional TiB\u2082-based grain refiners can remain a more economical choice.<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-754e38a elementor-widget elementor-widget-heading\" data-id=\"754e38a\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"heading.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t<h2 class=\"elementor-heading-title elementor-size-default\">Key Takeaways<\/h2>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-71ca80f elementor-widget elementor-widget-text-editor\" data-id=\"71ca80f\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t<p>NbB\u2082 can be used as a grain-refining material for aluminum alloys through several complementary mechanisms:<\/p><ol><li><strong>Heterogeneous nucleation:<\/strong> The NbB\u2082 (0001) surface provides active sites for \u03b1-Al nucleation.<\/li><li><strong>Resistance to silicon poisoning:<\/strong> NbB\u2082 is less susceptible to Si-related surface poisoning than TiB\u2082, making it particularly suitable for high-silicon Al-Si alloys.<\/li><li><strong>Grain-boundary pinning:<\/strong> Dispersed NbB\u2082 particles can help restrict grain growth after solidification.<\/li><li><strong>NbAl\u2083 synergy:<\/strong> Al-Nb-B master alloys can provide additional grain-refining effects through NbAl\u2083.<\/li><li><strong>Processing sensitivity:<\/strong> Particle size, dispersion, oxygen content, phase purity, and sedimentation can strongly influence practical performance.<\/li><\/ol>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-5d69108 elementor-widget elementor-widget-text-editor\" data-id=\"5d69108\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t<p>Overall, Niobium boride is best viewed as a <strong>specialized grain-refining material for silicon-rich aluminum alloys<\/strong>, rather than a universal replacement for TiB\u2082.<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-730c709 elementor-widget elementor-widget-heading\" data-id=\"730c709\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"heading.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t<h2 class=\"elementor-heading-title elementor-size-default\">Frequently Asked Questions<\/h2>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-2eb4121 elementor-widget elementor-widget-heading\" data-id=\"2eb4121\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"heading.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t<h3 class=\"elementor-heading-title elementor-size-default\">Q1. Why is niobium boride used for grain refinement of aluminum alloys?<\/h3>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-d945edb elementor-widget elementor-widget-text-editor\" data-id=\"d945edb\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t<p>Niobium boride provides heterogeneous nucleation sites for \u03b1-Al and promotes the formation of finer, more equiaxed aluminum grains during solidification.<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-30fa5e5 elementor-widget elementor-widget-heading\" data-id=\"30fa5e5\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"heading.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t<h3 class=\"elementor-heading-title elementor-size-default\">Q2. Why is niobium boride suitable for high-silicon aluminum alloys?<\/h3>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-17e1aef elementor-widget elementor-widget-text-editor\" data-id=\"17e1aef\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t<p>Niobium boride is more resistant to silicon poisoning than TiB\u2082, allowing more nucleation sites to remain active in silicon-rich Al-Si melts.<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-3b4936e elementor-widget elementor-widget-heading\" data-id=\"3b4936e\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"heading.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t<h3 class=\"elementor-heading-title elementor-size-default\">Q3. What NbB\u2082 particle size is suitable for aluminum grain refinement?<\/h3>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-9c79c4c elementor-widget elementor-widget-text-editor\" data-id=\"9c79c4c\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t<p>A <strong>D50 of approximately 0.5\u20133 \u03bcm<\/strong> is a useful range for balancing nucleation-site density and particle dispersion, although the optimum size depends on the alloy and processing conditions.<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-b002bc2 elementor-widget elementor-widget-heading\" data-id=\"b002bc2\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"heading.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t<h3 class=\"elementor-heading-title elementor-size-default\">Q4. Is NbB\u2082 better than TiB\u2082 for all aluminum alloys?<\/h3>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-aba923d elementor-widget elementor-widget-text-editor\" data-id=\"aba923d\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t<p>No. TiB\u2082 remains highly effective for many conventional low-silicon aluminum alloys. NbB\u2082 offers its greatest advantage in high-silicon Al-Si systems where TiB\u2082 can suffer from silicon poisoning.<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-473a81d elementor-widget elementor-widget-heading\" data-id=\"473a81d\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"heading.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t<h3 class=\"elementor-heading-title elementor-size-default\">Q5. What can reduce the grain-refining efficiency of niobium boride?<\/h3>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-8a11651 elementor-widget elementor-widget-text-editor\" data-id=\"8a11651\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t<p>Particle agglomeration, sedimentation, high oxygen or surface oxidation, and unwanted secondary phases can reduce the number of effective NbB\u2082 nucleation sites.<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t<div class=\"elementor-element elementor-element-1d2d921 e-con-full e-flex e-con e-child\" data-id=\"1d2d921\" data-element_type=\"container\" data-e-type=\"container\" data-settings=\"{&quot;background_background&quot;:&quot;classic&quot;}\">\n\t\t\t\t<div class=\"elementor-element elementor-element-9fc06b0 elementor-widget elementor-widget-heading\" data-id=\"9fc06b0\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"heading.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t<h3 class=\"elementor-heading-title elementor-size-default\">References<\/h3>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-7a50a2f elementor-icon-list--layout-traditional elementor-list-item-link-full_width elementor-widget elementor-widget-icon-list\" data-id=\"7a50a2f\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"icon-list.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t<ul class=\"elementor-icon-list-items\">\n\t\t\t\t\t\t\t<li class=\"elementor-icon-list-item\">\n\t\t\t\t\t\t\t\t\t\t<span class=\"elementor-icon-list-text\">[1] Bolzoni, L., &amp; Hari Babu, N. (2016). Heterogeneous Nb-Based Nuclei for the Grain Refinement of Al-Si Alloys. JOM, 68, 1301\u20131306.<\/span>\n\t\t\t\t\t\t\t\t\t<\/li>\n\t\t\t\t\t\t\t\t<li class=\"elementor-icon-list-item\">\n\t\t\t\t\t\t\t\t\t\t<span class=\"elementor-icon-list-text\">[2] Bolzoni, L., &amp; Hari Babu, N. (2016). Engineering the heterogeneous nuclei in Al-Si alloys for solidification control. Applied Materials Today, 5, 255\u2013259.<\/span>\n\t\t\t\t\t\t\t\t\t<\/li>\n\t\t\t\t\t\t\t\t<li class=\"elementor-icon-list-item\">\n\t\t\t\t\t\t\t\t\t\t<span class=\"elementor-icon-list-text\">[3] Li, Y., Jiang, Y., Liu, B., Luo, Q., Hu, B., &amp; Li, Q. (2021). Understanding grain refining and anti Si-poisoning effect in Al-10Si\/Al-5Nb-B system. Journal of Materials Science &amp; Technology, 65, 190\u2013201.<\/span>\n\t\t\t\t\t\t\t\t\t<\/li>\n\t\t\t\t\t\t\t\t<li class=\"elementor-icon-list-item\">\n\t\t\t\t\t\t\t\t\t\t<span class=\"elementor-icon-list-text\">[4] Density functional theory study of Al\/NbB\u2082 heterogeneous nucleation interface.<\/span>\n\t\t\t\t\t\t\t\t\t<\/li>\n\t\t\t\t\t\t\t\t<li class=\"elementor-icon-list-item\">\n\t\t\t\t\t\t\t\t\t\t<span class=\"elementor-icon-list-text\">[5] A mechanism for the poisoning effect of silicon on the grain refinement of Al-Si alloys. (2007). Acta Materialia, 55(4), 1447\u20131456.<\/span>\n\t\t\t\t\t\t\t\t\t<\/li>\n\t\t\t\t\t\t<\/ul>\n\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t<div class=\"elementor-element elementor-element-69bfd32 e-con-full e-flex e-con e-child\" data-id=\"69bfd32\" data-element_type=\"container\" data-e-type=\"container\" data-settings=\"{&quot;background_background&quot;:&quot;classic&quot;}\">\n\t\t\t\t<div class=\"elementor-element elementor-element-afb2c75 elementor-widget elementor-widget-heading\" data-id=\"afb2c75\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"heading.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t<h3 class=\"elementor-heading-title elementor-size-default\">Further Reading<\/h3>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-94df10a elementor-icon-list--layout-traditional elementor-list-item-link-full_width elementor-widget elementor-widget-icon-list\" data-id=\"94df10a\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"icon-list.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t<ul class=\"elementor-icon-list-items\">\n\t\t\t\t\t\t\t<li class=\"elementor-icon-list-item\">\n\t\t\t\t\t\t\t\t\t\t\t<a href=\"https:\/\/vimaterial.de\/en\/what-is-niobium-diboride-properties\/\">\n\n\t\t\t\t\t\t\t\t\t\t\t\t<span class=\"elementor-icon-list-icon\">\n\t\t\t\t\t\t\t<svg aria-hidden=\"true\" class=\"e-font-icon-svg e-far-arrow-alt-circle-right\" viewBox=\"0 0 512 512\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\"><path d=\"M504 256C504 119 393 8 256 8S8 119 8 256s111 248 248 248 248-111 248-248zm-448 0c0-110.5 89.5-200 200-200s200 89.5 200 200-89.5 200-200 200S56 366.5 56 256zm72 20v-40c0-6.6 5.4-12 12-12h116v-67c0-10.7 12.9-16 20.5-8.5l99 99c4.7 4.7 4.7 12.3 0 17l-99 99c-7.6 7.6-20.5 2.2-20.5-8.5v-67H140c-6.6 0-12-5.4-12-12z\"><\/path><\/svg>\t\t\t\t\t\t<\/span>\n\t\t\t\t\t\t\t\t\t\t<span class=\"elementor-icon-list-text\">What Is Niobium Diboride (NbB\u2082)? Properties, Preparation, Applications and Advantages<\/span>\n\t\t\t\t\t\t\t\t\t\t\t<\/a>\n\t\t\t\t\t\t\t\t\t<\/li>\n\t\t\t\t\t\t\t\t<li class=\"elementor-icon-list-item\">\n\t\t\t\t\t\t\t\t\t\t\t<a href=\"https:\/\/vimaterial.de\/en\/nano-niobium-pentoxide-powder\/\">\n\n\t\t\t\t\t\t\t\t\t\t\t\t<span class=\"elementor-icon-list-icon\">\n\t\t\t\t\t\t\t<svg aria-hidden=\"true\" class=\"e-font-icon-svg e-far-arrow-alt-circle-right\" viewBox=\"0 0 512 512\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\"><path d=\"M504 256C504 119 393 8 256 8S8 119 8 256s111 248 248 248 248-111 248-248zm-448 0c0-110.5 89.5-200 200-200s200 89.5 200 200-89.5 200-200 200S56 366.5 56 256zm72 20v-40c0-6.6 5.4-12 12-12h116v-67c0-10.7 12.9-16 20.5-8.5l99 99c4.7 4.7 4.7 12.3 0 17l-99 99c-7.6 7.6-20.5 2.2-20.5-8.5v-67H140c-6.6 0-12-5.4-12-12z\"><\/path><\/svg>\t\t\t\t\t\t<\/span>\n\t\t\t\t\t\t\t\t\t\t<span class=\"elementor-icon-list-text\">What Are the Uses of Nano Niobium Pentoxide (Nb\u2082O\u2085)?An In-Depth Overview<\/span>\n\t\t\t\t\t\t\t\t\t\t\t<\/a>\n\t\t\t\t\t\t\t\t\t<\/li>\n\t\t\t\t\t\t\t\t<li class=\"elementor-icon-list-item\">\n\t\t\t\t\t\t\t\t\t\t\t<a href=\"https:\/\/vimaterial.de\/en\/spherical-c103-alloy-powder\/\">\n\n\t\t\t\t\t\t\t\t\t\t\t\t<span class=\"elementor-icon-list-icon\">\n\t\t\t\t\t\t\t<svg aria-hidden=\"true\" class=\"e-font-icon-svg e-far-arrow-alt-circle-right\" viewBox=\"0 0 512 512\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\"><path d=\"M504 256C504 119 393 8 256 8S8 119 8 256s111 248 248 248 248-111 248-248zm-448 0c0-110.5 89.5-200 200-200s200 89.5 200 200-89.5 200-200 200S56 366.5 56 256zm72 20v-40c0-6.6 5.4-12 12-12h116v-67c0-10.7 12.9-16 20.5-8.5l99 99c4.7 4.7 4.7 12.3 0 17l-99 99c-7.6 7.6-20.5 2.2-20.5-8.5v-67H140c-6.6 0-12-5.4-12-12z\"><\/path><\/svg>\t\t\t\t\t\t<\/span>\n\t\t\t\t\t\t\t\t\t\t<span class=\"elementor-icon-list-text\">Spherical C103 Alloy Powder: Analysis and Application<\/span>\n\t\t\t\t\t\t\t\t\t\t\t<\/a>\n\t\t\t\t\t\t\t\t\t<\/li>\n\t\t\t\t\t\t\t\t<li class=\"elementor-icon-list-item\">\n\t\t\t\t\t\t\t\t\t\t\t<a href=\"https:\/\/vimaterial.de\/en\/what-is-niobium-oxide\/\">\n\n\t\t\t\t\t\t\t\t\t\t\t\t<span class=\"elementor-icon-list-icon\">\n\t\t\t\t\t\t\t<svg aria-hidden=\"true\" class=\"e-font-icon-svg e-far-arrow-alt-circle-right\" viewBox=\"0 0 512 512\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\"><path d=\"M504 256C504 119 393 8 256 8S8 119 8 256s111 248 248 248 248-111 248-248zm-448 0c0-110.5 89.5-200 200-200s200 89.5 200 200-89.5 200-200 200S56 366.5 56 256zm72 20v-40c0-6.6 5.4-12 12-12h116v-67c0-10.7 12.9-16 20.5-8.5l99 99c4.7 4.7 4.7 12.3 0 17l-99 99c-7.6 7.6-20.5 2.2-20.5-8.5v-67H140c-6.6 0-12-5.4-12-12z\"><\/path><\/svg>\t\t\t\t\t\t<\/span>\n\t\t\t\t\t\t\t\t\t\t<span class=\"elementor-icon-list-text\">What Is Niobium Oxide? Properties, Uses, and How to Store It<\/span>\n\t\t\t\t\t\t\t\t\t\t\t<\/a>\n\t\t\t\t\t\t\t\t\t<\/li>\n\t\t\t\t\t\t\t\t<li class=\"elementor-icon-list-item\">\n\t\t\t\t\t\t\t\t\t\t\t<a href=\"https:\/\/vimaterial.de\/en\/niobium\/\">\n\n\t\t\t\t\t\t\t\t\t\t\t\t<span class=\"elementor-icon-list-icon\">\n\t\t\t\t\t\t\t<svg aria-hidden=\"true\" class=\"e-font-icon-svg e-far-arrow-alt-circle-right\" viewBox=\"0 0 512 512\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\"><path d=\"M504 256C504 119 393 8 256 8S8 119 8 256s111 248 248 248 248-111 248-248zm-448 0c0-110.5 89.5-200 200-200s200 89.5 200 200-89.5 200-200 200S56 366.5 56 256zm72 20v-40c0-6.6 5.4-12 12-12h116v-67c0-10.7 12.9-16 20.5-8.5l99 99c4.7 4.7 4.7 12.3 0 17l-99 99c-7.6 7.6-20.5 2.2-20.5-8.5v-67H140c-6.6 0-12-5.4-12-12z\"><\/path><\/svg>\t\t\t\t\t\t<\/span>\n\t\t\t\t\t\t\t\t\t\t<span class=\"elementor-icon-list-text\">Niobium: A Key Element in High-Tech Industries<\/span>\n\t\t\t\t\t\t\t\t\t\t\t<\/a>\n\t\t\t\t\t\t\t\t\t<\/li>\n\t\t\t\t\t\t<\/ul>\n\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t<div class=\"elementor-element elementor-element-843a8d2 e-con-full e-flex e-con e-child\" data-id=\"843a8d2\" data-element_type=\"container\" data-e-type=\"container\" data-settings=\"{&quot;background_background&quot;:&quot;classic&quot;}\">\n\t\t\t\t<div class=\"elementor-element elementor-element-25c0218 elementor-widget elementor-widget-heading\" data-id=\"25c0218\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"heading.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t<h3 class=\"elementor-heading-title elementor-size-default\">Need a Custom Niobium Boride?<\/h3>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-54b51db elementor-widget elementor-widget-text-editor\" data-id=\"54b51db\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t<p><span style=\"color: #0000ff;\"><strong><a style=\"color: #0000ff;\" href=\"https:\/\/vimaterial.de\/en\/about-vimaterial\/\">VIMATERIAL<\/a><\/strong><\/span>\u00a0supplies <strong>high-purity <span style=\"color: #0000ff;\"><a style=\"color: #0000ff;\" href=\"https:\/\/vimaterial.de\/en\/product\/niobium-boride-powder\">niobium diboride (NbB\u2082) powder<\/a><\/span><\/strong> for advanced ceramic, metallurgical, and aluminum alloy applications.<\/p><p>For aluminum alloy grain refinement, the appropriate NbB\u2082 grade can be selected based on <strong>purity, particle size, particle morphology, chemical composition, and required addition level<\/strong> to achieve consistent nucleation and grain-refining performance.<\/p><p><strong>Contact VIMATERIAL to discuss NbB\u2082 powder specifications for your aluminum alloy application.<\/strong><\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t<div class=\"elementor-element elementor-element-f27ca46 e-con-full e-flex e-con e-child\" data-id=\"f27ca46\" data-element_type=\"container\" data-e-type=\"container\">\n\t\t\t\t<div class=\"elementor-element elementor-element-76f2fd0 elementor-widget elementor-widget-button\" data-id=\"76f2fd0\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"button.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t<div class=\"elementor-button-wrapper\">\n\t\t\t\t\t<a class=\"elementor-button elementor-button-link elementor-size-sm\" href=\"#elementor-action%3Aaction%3Dpopup%3Aopen%26settings%3DeyJpZCI6MTAzNTA2NywidG9nZ2xlIjpmYWxzZX0%3D\">\n\t\t\t\t\t\t<span class=\"elementor-button-content-wrapper\">\n\t\t\t\t\t\t\t\t\t<span class=\"elementor-button-text\">Request a Quote<\/span>\n\t\t\t\t\t<\/span>\n\t\t\t\t\t<\/a>\n\t\t\t\t<\/div>\n\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-bd53281 elementor-widget elementor-widget-button\" data-id=\"bd53281\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"button.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t<div class=\"elementor-button-wrapper\">\n\t\t\t\t\t<a class=\"elementor-button elementor-button-link elementor-size-sm\" href=\"https:\/\/vimaterial.de\/en\/contact-us\/\">\n\t\t\t\t\t\t<span class=\"elementor-button-content-wrapper\">\n\t\t\t\t\t\t\t\t\t<span class=\"elementor-button-text\">Contact Us<\/span>\n\t\t\t\t\t<\/span>\n\t\t\t\t\t<\/a>\n\t\t\t\t<\/div>\n\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t","protected":false},"excerpt":{"rendered":"<p>Niobium boride (NbB\u2082) is a high-melting-point boride with a hexagonal AlB\u2082-type crystal structure. In aluminum alloy processing, NbB\u2082 can act as an effective heterogeneous nucleation substrate and promote the formation of fine, equiaxed \u03b1-Al grains during solidification. Its most important advantage is found in high-silicon Al-Si alloys, where conventional TiB\u2082-based grain refiners may lose effectiveness [&hellip;]<\/p>\n","protected":false},"author":5,"featured_media":1055319,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"footnotes":""},"categories":[338,333],"tags":[386,463],"class_list":["post-1055316","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-ceramic-materials","category-semiconductor-materials","tag-applications","tag-niobium-boride"],"acf":[],"_links":{"self":[{"href":"https:\/\/vimaterial.de\/en\/wp-json\/wp\/v2\/posts\/1055316","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/vimaterial.de\/en\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/vimaterial.de\/en\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/vimaterial.de\/en\/wp-json\/wp\/v2\/users\/5"}],"replies":[{"embeddable":true,"href":"https:\/\/vimaterial.de\/en\/wp-json\/wp\/v2\/comments?post=1055316"}],"version-history":[{"count":5,"href":"https:\/\/vimaterial.de\/en\/wp-json\/wp\/v2\/posts\/1055316\/revisions"}],"predecessor-version":[{"id":1055325,"href":"https:\/\/vimaterial.de\/en\/wp-json\/wp\/v2\/posts\/1055316\/revisions\/1055325"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/vimaterial.de\/en\/wp-json\/wp\/v2\/media\/1055319"}],"wp:attachment":[{"href":"https:\/\/vimaterial.de\/en\/wp-json\/wp\/v2\/media?parent=1055316"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/vimaterial.de\/en\/wp-json\/wp\/v2\/categories?post=1055316"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/vimaterial.de\/en\/wp-json\/wp\/v2\/tags?post=1055316"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}