Aluminum Oxide

Aluminum Oxide Ceramic Substrates are thin, rigid plates or sheets made from aluminum oxide, known for their exceptional electrical insulation, thermal stability, mechanical strength, and corrosion resistance. These substrates are widely used in electronics, optics, automotive, and aerospace industries, where durable, heat-resistant, and electrically insulating surfaces are essential.

Composition:

Aluminum oxide ceramic substrates are typically high-purity Al₂O₃ (ranging from 96% to 99.9% purity). Higher purities enhance the substrate’s electrical insulation, thermal conductivity, and stability, especially in applications requiring precision and reliability.

Physical and Mechanical Properties:

High Density and Hardness: Aluminum oxide ceramic substrates are dense and hard, ranking around 9 on the Mohs hardness scale, providing exceptional durability against wear, abrasion, and mechanical stress.

Flatness and Smoothness: These substrates have a smooth, flat surface, which is essential for applications involving thin-film deposition, electronic circuits, and microelectronics, ensuring consistency and reliability in component mounting and bonding.

Thermal Properties:

High Thermal Stability: Aluminum oxide ceramic substrates withstand high temperatures (up to around 1500°C or 2732°F), making them suitable for applications with significant thermal exposure.

Moderate Thermal Conductivity: Al₂O₃ provides effective heat dissipation, which is beneficial in applications where thermal management is crucial, such as power electronics and LED lighting.

Electrical Insulation: One of the key properties of aluminum oxide ceramic substrates is their excellent electrical insulation. Al₂O₃ substrates have high dielectric strength, making them ideal for isolating electrical components and circuits, preventing short circuits, and improving component lifespan.

Chemical Inertness and Corrosion Resistance: Aluminum oxide is chemically inert and resists corrosion, even in challenging environments with exposure to chemicals or humidity. This ensures the longevity and reliability of Al₂O₃ substrates in various operating conditions.

Applications:

Electronic Circuit Boards: Aluminum oxide ceramic substrates are commonly used as base materials for thick-film and thin-film circuits due to their insulating properties, providing a stable foundation for electronic components and protecting against electrical interference.

LED Lighting: Aluminum oxide substrates are used in LED modules, where they help dissipate heat and maintain stability in high-performance lighting systems.

Power Electronics: In high-power applications like IGBTs, MOSFETs, and hybrid circuits, Al₂O₃ substrates support heat dissipation and electrical insulation, essential for efficient operation and reliability.

Medical Devices: Biocompatible, durable, and corrosion-resistant, aluminum oxide substrates are used in medical implants, diagnostic devices, and surgical tools.

Optical and Sensor Applications: With a smooth surface and thermal stability, Al₂O₃ substrates serve as mounting bases in optical systems and sensor devices.