Combustion Synthesis of AlN-SiC Solid Solutions and their Applications

• Main Authors: Sheng-ChunTseng, 曾聖淳
• Other Authors: Shyan-Lung Chung
• Format: Others
• Language: zh-TW
• Published: 2013
• Online Access: http://ndltd.ncl.edu.tw/handle/k65wth

碩士 === 國立成功大學 === 化學工程學系碩博士班 === 101 === Aluminum nitride (AlN) has many superior properties, but in practical application has not been growth rapidly as expected, one of the main reasons is the application problems has not resolved. The key point of the application problems is that AlN is easy to react with water for hydrolysis and deliquescence. The lattice structure, density and atomic size of AlN and silicon carbide (SiC) are very similar that they can form solid solutions in under certain conditions. This thesis wants to improve the hydrolyzed resistance and moisture resistance of AlN by solid solutions of AlN-SiC. Combustion synthesis AlN-SiC solid solutions at low nitrogen pressure region: properties decide by the ratio of Al and Si, the nitrogen pressure has poor correlation with properties. The flaky aluminum is unsuitable to synthesis solid solutions Due to the physical factors of shape. The experiment results show that AlN-SiC solid solutions synthesis by combustion synthesis has better hydrolyzed resistance and moisture resistance, reduce the forming rate of aluminium hydroxide (Al(OH)3) obviously. At high temperature (110℃) surrounding, the hydrolyzed resistance of AlN-SiC solid solutions even better than the phosphoric acid (H3PO4) surface treatment of AlN. The composition of AlN increase, the property of AlN-SiC solid solutions trend to AlN, but only solid solution trace amounts of SiC (5 mol%) can extend the time of forming Al(OH)3 obviously. Although combustion synthesis of AlN-SiC solid solutions has unreacted agent, the composites with epoxy has high thermal conductivity above half of AlN’s composites.