RMI法制备C/C-SiC炭陶复合材料的热学性能研究

Thermal properties of C/C-SiC composites prepared by reactive melt infiltration method

以针刺网胎无纬布为预制体,采用压力浸渍树脂/炭化工艺结合反应熔体浸渗法(RMI)快速制备C/C-SiC炭陶复合材料。研究了炭陶复合材料在室温~800℃时的热扩散系数、比热容和导热系数等热学性能参数和在室温~1 000℃时的热膨胀系数。结果表明:x-y向(平面方向)和z向(厚度方向)的比热容和热膨胀系数呈非线性增大,而热扩散系数和导热系数则呈非线性降低;x-y向的热扩散系数及导热系数明显大于z向,表明炭陶材料呈各向异性;1 000℃时x-y向平均热膨胀系数为1.506×10^(-6)/℃,低于z向的平均热膨胀系数(3.666×10^(-6)/℃)。

The C/C-SiC composites were fabricated by the combination of resin impregnation/carbonization （IC） with reactive melt infiltration （RMI）. The effects on thermal properties of C/C-SiC composites were investigated. The results show that both the specific heat capacity and coefficient of thermal expansion （CTE） on x-y direction and z direction of C/C-SiC increase with the increase of temperature. At the same temperature,the thermal diffusivity coefficient and thermal conductivity coefficient of C/C-SiC decrease with the increase of temperature. The thermal diffusivity coefficient and thermal conductivity coefficient on x-y direction were obvi- ously larger than that on z direction. The CTE on x-y direction of C/C-SiC is 1.506×10^-6/℃ at 1 000 ℃ ,which is smaller than the value ofz direction of 3.666×10^-6/℃.