Aluminum Nitride Ceramic Material

Aluminum nitride ceramics: AIN crystal is covalently bonded compound with 〔AIN4〕 tetrahedron as the structural unit, has a wurtzite structure, and belongs to the hexagonal crystal system. Chemical composition AI 65.81%, N 34.19%, specific gravity 3.261g/cm3, white or off-white, single crystal colorless and transparent, sublimation decomposition temperature under normal pressure is 2450 ℃. It is a high-temperature heat-resistant material. Thermal expansion coefficient (4.0-6.0) X10-6/℃. 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 extreme heat of 2200°C. In addition, aluminum nitride has the characteristics that it is not corroded by molten aluminum, other molten metals and gallium arsenide, especially has excellent corrosion resistance to molten aluminum.