{"id":1056584,"date":"2026-09-21T16:59:20","date_gmt":"2026-09-21T08:59:20","guid":{"rendered":"https:\/\/vimaterial.de\/?p=1056584"},"modified":"2026-09-21T17:07:15","modified_gmt":"2026-09-21T09:07:15","slug":"hafnium-diboride-properties-structure","status":"publish","type":"post","link":"https:\/\/vimaterial.de\/en\/hafnium-diboride-properties-structure\/","title":{"rendered":"Hafnium Diboride (HfB\u2082): Properties, Structure and Applications"},"content":{"rendered":"\t\t
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Hafnium diboride (HfB\u2082)<\/a><\/span><\/strong>, also known as hafnium boride, is a refractory ceramic compound composed of hafnium and boron. It is widely studied as an ultra-high-temperature ceramic (UHTC) because of its high melting point, hardness, thermal conductivity, electrical conductivity and chemical stability.<\/p>

HfB\u2082 is particularly relevant for applications where conventional metals and ceramics cannot maintain their performance under extreme temperatures, including high-temperature structural components, protective coatings, aerospace materials and advanced ceramic research.<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t

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What Is Hafnium Diboride?<\/h2>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t
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Hafnium diboride has the chemical formula HfB\u2082 and CAS No. 12007-23-7<\/a><\/span>. Its molecular weight is approximately 200.11 g\/mol.<\/p>

The material is typically supplied as a grey to grey-black powder or metallic-lustre crystalline material. Its density is approximately 10.5 g\/cm\u00b3, while the melting point is generally given in the range of approximately 3250\u20133380\u00b0C, depending on material composition and measurement conditions.<\/p>

HfB\u2082 belongs to the family of transition-metal diborides and has a hexagonal AlB\u2082-type crystal structure with space group P6\/mmm. In this structure, hafnium and boron atoms form a stable layered arrangement that contributes to the material’s combination of ceramic hardness and metallic-type electrical and thermal conductivity.<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t

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Key Properties of Hafnium Diboride<\/h2>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t
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The main properties that make hafnium diboride attractive for high-temperature applications include:<\/p>
Property<\/th>Typical information<\/th><\/tr><\/thead>
Chemical formula<\/td>HfB\u2082<\/td><\/tr>
CAS No.<\/td>12007-23-7<\/td><\/tr>
Molecular weight<\/td>~200.11 g\/mol<\/td><\/tr>
Crystal structure<\/td>Hexagonal, AlB\u2082-type<\/td><\/tr>
Space group<\/td>P6\/mmm<\/td><\/tr>
Appearance<\/td>Grey to grey-black powder \/ metallic-lustre crystal<\/td><\/tr>
Density<\/td>~10.5 g\/cm\u00b3<\/td><\/tr>
Melting point<\/td>Approximately 3250\u20133380\u00b0C<\/td><\/tr>
Hardness<\/td>High; reported microhardness values vary with material and test conditions<\/td><\/tr>
Thermal conductivity<\/td>High compared with many conventional ceramics<\/td><\/tr>
Electrical conductivity<\/td>Good<\/td><\/tr>
Chemical stability<\/td>High under many ambient conditions<\/td><\/tr><\/tbody><\/table>

The exact values should be evaluated together with purity, particle size, phase composition, density and processing history rather than treated as universal specifications.<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t

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1. Extremely High Temperature Resistance<\/h3>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t
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One of the most important characteristics of Hafnium boride is its extremely high melting point. Values of approximately 3250\u20133380\u00b0C place hafnium diboride among the refractory materials considered for ultra-high-temperature environments.<\/p>

This property makes HfB\u2082 attractive for components and coatings exposed to severe thermal conditions, particularly when dimensional stability and resistance to thermal degradation are required.<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t

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2. High Hardness<\/h3>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t
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Hafnium boride is a hard ceramic material. Its strong bonding and dense crystal structure contribute to high hardness and wear resistance.<\/p>

For powder and ceramic applications, hardness is particularly relevant when hafnium diboride is used as a reinforcing phase, wear-resistant coating material or high-temperature structural ceramic.<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t

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3. Thermal Conductivity and Thermal Stability<\/h3>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t
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Unlike many conventional oxide ceramics, Hafnium boride combines ceramic hardness with relatively high thermal and electrical conductivity. Its thermal conductivity is commonly considered to be in the approximate range of 60\u2013100 W\/(m\u00b7K), although the actual value can vary with temperature, density, porosity, purity and microstructure.<\/p>

Its relatively low thermal expansion and high thermal conductivity can also be beneficial in applications involving rapid temperature changes.<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t

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4. Electrical Conductivity<\/h3>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t
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Hafnium diboride has good electrical conductivity for a ceramic material. This characteristic allows it to be considered for electrically conductive high-temperature components, electrodes and selected electronic-material applications.<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t

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5. Chemical Stability<\/h3>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t
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Hafnium diboride is chemically stable under many room-temperature conditions and is resistant to many chemical environments, although hydrofluoric acid is an important exception.<\/p>

High-temperature oxidation behaviour is different from room-temperature chemical stability and should therefore be considered separately when designing components for oxidising environments.<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t

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HfB\u2082 as an Ultra-High-Temperature Ceramic<\/h2>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t
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Hafnium boride is generally considered part of the ultra-high-temperature ceramic family because its melting point and high-temperature stability allow it to operate in environments beyond the practical range of many conventional engineering materials.<\/p>

However, Hafnium diboride is not selected simply because of its melting point. In practical ceramic processing, factors such as powder purity, particle-size distribution, oxygen and carbon impurities, phase composition, sintering behaviour and final density can strongly influence performance.<\/p>

Fine and relatively uniform powders can be beneficial for achieving improved packing and sintering behaviour, while excessive surface area can also increase the tendency toward agglomeration.<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t

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Applications of Hafnium Diboride (HfB\u2082)<\/h2>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t
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Hafnium diboride is mainly considered for applications that require a combination of very high temperature resistance, hardness, thermal conductivity, electrical conductivity and chemical stability. Its applications can be broadly divided into high-temperature ceramics, protective coatings, electronic materials and advanced materials research.<\/p>

High-Temperature Structural Materials<\/strong><\/p>

Hafnium boride is suitable for research and development of high-temperature structural ceramics where resistance to extreme heat, mechanical wear and chemical degradation is required.<\/p>

It can be used as a matrix material, reinforcing phase or ceramic component in systems designed for demanding thermal environments, including aerospace and high-temperature engineering applications.<\/p>

Protective and Wear-Resistant Coatings<\/strong><\/p>

The high hardness, thermal stability and chemical resistance of HfB\u2082 make it a candidate material for protective coatings exposed to severe thermal or mechanical conditions.<\/p>

HfB\u2082-containing coatings can be investigated for applications requiring resistance to wear, erosion and high-temperature degradation. The final coating performance depends strongly on coating composition, deposition method, substrate compatibility and processing conditions.<\/p>

Aerospace and Ultra-High-Temperature Applications<\/strong><\/p>

Hafnium boride is of interest in aerospace materials research because of its combination of extremely high melting point, thermal stability and mechanical strength.<\/p>

It can be considered for ultra-high-temperature ceramic systems and thermal protection components where conventional materials may lose their mechanical or dimensional stability at extreme temperatures. In practical aerospace applications, oxidation resistance and environmental durability must also be evaluated alongside the intrinsic properties of HfB\u2082.<\/p>

Electronic and Electrically Conductive Materials<\/strong><\/p>

HfB\u2082 combines ceramic hardness with relatively high electrical and thermal conductivity, making it suitable for research into electrically conductive ceramic components and high-temperature electronic materials.<\/p>

It has also been investigated for field-emission applications, where electrical conductivity, thermal stability and surface characteristics are important.<\/p>

Advanced Ceramic Composites<\/strong><\/p>

HfB\u2082 can be incorporated into ceramic composites as a reinforcing or functional phase. Its high hardness, thermal stability and conductivity can complement the properties of other ceramic materials.<\/p>

The final performance of an HfB\u2082-containing composite depends on factors such as phase composition, particle size, dispersion, interface bonding and sintering conditions.<\/p>

High-Temperature Research and Specialized Materials<\/strong><\/p>

Beyond established ceramic applications, HfB\u2082 is used in advanced materials research involving refractory ceramics, high-temperature coatings, functional materials and other specialized material systems.<\/p>

For research and development, HfB\u2082 powder can be selected according to purity, particle size, morphology and other parameters required by the synthesis or processing method.<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t

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How Is HfB\u2082 Powder Produced?<\/h2>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t
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Several synthesis routes can be used to produce hafnium diboride.<\/p>

One established approach is a high-temperature carbothermal reduction route using hafnium oxide, boron-containing materials and carbon. HfO\u2082, B\u2082O\u2083 and carbon can serve as typical starting materials for this type of synthesis.<\/p>

Other approaches include precursor-based synthesis, reduction reactions and gas-phase deposition methods. The selected process affects the resulting powder’s purity, particle size, morphology, phase composition and surface characteristics.<\/p>

For high-performance applications, the synthesis route should therefore be considered together with the final powder specification rather than evaluated independently.<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t

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What Should Be Considered When Selecting HfB\u2082 Powder?<\/h2>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t
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For research and industrial applications, several parameters are particularly important:<\/p>

Purity:<\/strong> High-purity hafnium diboride can help reduce the influence of oxygen, carbon and other secondary phases.<\/p>

Particle size:<\/strong> Particle size and distribution influence surface area, dispersion, packing and sintering behaviour.<\/p>

Phase composition:<\/strong> XRD analysis can be used to identify the primary HfB\u2082 phase and possible secondary phases.<\/p>

Morphology:<\/strong> Particle morphology can affect powder flow, dispersion and subsequent processing.<\/p>

Packaging:<\/strong> Fine hafnium boride powder should be protected from moisture and unnecessary exposure to air to reduce agglomeration and maintain consistent powder handling behaviour.<\/p>

VIMATERIAL can supply hafnium diboride powder in nano- or micron-scale particle sizes, with purity of 99%. Particle size and purity can also be customized according to specific application requirements.<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t

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HfB\u2082 Powder from VIMATERIAL<\/h2>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t
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VIMATERIAL supplies hafnium diboride powder<\/a> <\/span>for research, advanced ceramics, high-temperature materials and other specialized applications.<\/p>

Depending on the application, specifications can be discussed according to:<\/p>