【作者】 易法军； 张巍； 韩杰才； 杜善义；

【Author】 Yi Fajun Zhang Wei Han Jiecai Du Shanyi(Center for Composite Materials of Harbin Institute of Technology , Harbin, 150001)

【机构】 哈尔滨工业大学复合材料研究所；

【摘要】 实验研究了烧蚀防热用混杂C/C复合材料从常温到高温的热扩散率和比热随温度的变化情况,并计算了材料不同温度下的导热系数。结果表明:材料热扩散率随温度升高而下降,比热随温度升高近似比例增加,导热系数随温度的变化规律与热扩散率相似,材料的抗热应力系数随温度的升高变化不大,抗热震性能稳定。更多还原

【Abstract】 In present paper, thermal diffusivity and specific heat of ablation thermal protective composites-hybrid C/C composites from room temperature to ultra high temperature have been experimentally investigated. Thermal conductivity and thermal stress resistance of the composite are therefore computed based on experimental results. The results show that thermal diffusivity decreases exponentially with increasing temperature. The specific heat increases linear with temperature. And thermal conductivity has a similar variety as thermal diffusivity. Thermal stress resistance has a little change with temperature, the thermal stress resistance of the composite keeps stable.更多还原