C/Mullite/Si-C-N复合材料热扩散行为分析

Analysis on the Behaviors of Thermal Diffusion of the C/Mullite/Si-C-N Composites

制备了具有莫来石界面层的炭纤维增强Si-C-N陶瓷基复合材料(C/Mullite/Si-C-N)。用激光导热仪测试C/Mullite/Si-C-N的热扩散性能,用Origin拟合工具分析复合材料热扩散率与温度的关系。研究结果表明:在测试温度范围内,C/Mullite/Si-C-N复合材料的热扩散率随温度的升高而减小,并与温度呈一种指数关系,Si-C-N基体在测试过程中的结构变化是热扩散率呈现指数关系的根本原因。

The carbon fiber reinforced Si-C-N ceramic matrix composite with a mullite interlayer（C/Mullite/Si-C-N）. The thermal diffusion properties of C/Mullite/Si-C-N were investigated using laser flash apparatus. The relationship between thermal diffusivity and temperature of the composite was analyzed by curve fitting method with origin software. The results indicate that the thermal diffusivity of C/Mullite/Si-CN composite decreases with the increase of temperature has an exponential relation with temperature in the test temperature range. The structural change of the Si-C-N matrix during the test is key reason why the thermal diffusivity exhibits an exponential relationship with temperature.