低成本制造C/SiC复合材料的热物理性能研究  

Research on thermal physical properties of C/SiC composite manufactured with low-cost process

作　　者：白龙腾[1] 杨晓辉[1] 王毅[1] 赵新辉[1] 郑道道 

机构地区：[1]西安航天动力研究所,陕西西安710100

出　　处：《火箭推进》2016年第1期58-65,共8页Journal of Rocket Propulsion

摘　　要：采用先驱体浸渍裂解工艺制备了三维针刺C/Si C复合材料,系统地研究了其热物理性能。结果表明:该低成本制造工艺制备的C/Si C复合材料热膨胀系数随温度升高总体上呈增大趋势,但随着温度的升高,热膨胀系数增大程度逐渐减弱,并且z向的热膨胀系数要高于x-y方向,而CVD-Si C涂层的存在会降低其热膨胀性能;C/Si C复合材料比热容、导热率也随着温度的升高呈现逐渐增大的趋势,但增加速率逐渐减小。CVD-Si C涂层的存在会提高C/Si C复合材料的导热性能,有利于C/Si C复合材料产品与外界环境的热能交换,但会使材料的比热容降低。Three-dimensional needled C/Si C composite was prepared with the precursor infiltration pyrolysis process, whose thermal physical properties were studied systematically. The results show that thermal expansion coefficient of the C/Si C composite manufactured with the low-cost process tends to increase with temperature increment in general, but the enlargement degree of thermal expansion coefficient weakens gradually with the increase of temperature, the thermal expansion coefficient in z direction is bigger than that in x-y direction, and the presence of CVD-Si C coating reduces its thermal expansion properties; the specific heat capacity and thermal conductivity of the C/Si C composite appears as a gradual increasing trend with the increase of temperature, but its increase rate decreases gradually. The CVD-Si C coating may improve thermal conductivity of the C/Si C composites, which is in favour of heat exchange of the C/Si C composite with the external environment,but may reduce its specific heat capacity.

关 键 词：低成本制造 C/SIC复合材料 热物理性能 热膨胀系数 热导率 

分 类 号：V434-34[航空宇航科学与技术—航空宇航推进理论与工程]