At present, the ceramic substrates commonly used in thermal conductive ceramic industry mainly include aluminum nitride ceramic substrate and alumina ceramic substrate. What is AlN ceramic? What is alumina ceramics? What are the differences between the two ceramic substrates?, Here is a summary by witter
First, we introduce the aluminum nitride ceramic substrate
1. Aluminum nitride ceramic is a kind of ceramic with aluminum nitride (AIN) as the main crystalline phase.
2. Ain crystal is composed of (ain4) tetrahedron and covalent bond compound. It has wurtzite structure and belongs to hexagonal system.
3. Its chemical composition is ai65.81%, n34.19%, specific gravity is 3.261g/cm3, white or grayish white, single crystal is colorless and transparent, and its sublimation decomposition temperature is 2450 ℃ under normal pressure.
4. AlN ceramic is a kind of high temperature and heat-resistant material, and its coefficient of thermal expansion is (4.0-6.0) x10 (- 6) / ℃.
5. The thermal conductivity of polycrystalline ain is 260W / (m.k), which is 5-8 times higher than that of alumina, so it has good thermal shock resistance and can withstand high temperature of 2200 ℃.
6. AlN Ceramics have excellent corrosion resistance.
Then, the alumina ceramic substrate is introduced
1. Alumina ceramic is a kind of ceramic material based on alumina, which is used in thick film integrated circuits.
2. Alumina ceramic is a kind of alumina ceramic material, which is a close packed hexagonal structure composed of oxygen ions.
3. Alumina ceramics have good conductivity, mechanical strength and high temperature resistance. It should be noted that ultrasonic washing is required.
4. Alumina ceramics have high melting point, high hardness and excellent wear resistance.
5. Wide range of applications, used in high-power equipment, IC MOS tube, IGBT chip thermal insulation, high-frequency power supply, communication, mechanical equipment, high current, high voltage, high temperature and other products requiring thermal insulation.
Through the above introduction of aluminum nitride ceramic substrate and alumina ceramic substrate, we understand that the difference between the two is still very big, so you must choose the ceramic substrate suitable for your products when you purchase. Friends who need to buy ceramic substrate, please recognize Yixing Weite Ceramic Co., Ltd.
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