Aluminum nitride composite ceramic
A technology of composite ceramics and aluminum nitride, which is applied in the field of aluminum nitride composite ceramics to achieve the effect of improving comprehensive technical performance, low cost and high performance
Active Publication Date: 2014-12-10
LIAONING YIFEI TECH
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Problems solved by technology
Solve the technical problem of improving the performance of single silicon nitride ceramics
Method used
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Experimental program
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Effect test
Embodiment
[0025] Compared with simple aluminum nitride ceramics, the performance index of the aluminum alloy casting sprue cap made of the aluminum nitride composite ceramics of the present invention fully meets the relevant technical indexes, and the service life is prolonged by 3-5 times.
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The invention relates to the ceramic filed and particular relates to an aluminum nitride composite ceramic. The aluminum nitride composite ceramic comprises the following components in parts by mass: 3-5 parts of silicon nitride, 10-15 parts of silicon oxynitride, 30-50 parts of aluminum nitride, 20-40 parts of silicon dioxide, and 10-20 parts of magnesium oxide. The aluminum nitride composite ceramic is prepared through steps of raw material pulping, injection moulding, drying and sintering. Based on the aluminum nitride raw material, the aluminum nitride composite ceramic also comprises the silicon nitride, the silicon oxynitride, the silicon dioxide and the magnesium oxide, so that the synthesis technique property of the aluminum nitride composite ceramic is improved. Compared with ceramic prepared only by aluminum nitride, the composite ceramic is greatly improved in properties, and is suitable for being used as the aluminum nitride composite ceramic material.
Description
technical field [0001] The invention relates to an aluminum nitride composite ceramic in the field of ceramics. Background technique [0002] Aluminum Nitride Ceramic (Aluminum Nitride Ceramic) is a ceramic with aluminum nitride (AIN) as the main crystal phase. AIN crystal is a 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) / ° C. 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 tha...
Claims
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IPC IPC(8): C04B35/582
Inventor 徐涛李鑫
Owner LIAONING YIFEI TECH