碳/碳复合材料的热物理性能和抗热震性的研究

本文用激光脉冲法、石英示差法和激光扫描法研究测量了室温至2000℃碳/碳复合材料的热物理性能,包括导热系数和热膨胀系数。通过抗热震系数研究分析了三向细编碳/碳复合材料和碳布两向增强碳/碳复合材料的抗热震性。研究了温度、密度和取向等对碳/碳复合材料的热物理性能和抗热震性的影响。

THERMOPHYSICAL AND THERMAL-SHOCK RESISTANCE PROPERTIES OF CARBON-CARBON COMPOSITES

In this paper the thermophysical properties of carbon-carbon composites, including the coefficient of thermal conductivity and the coefficient of thermal expansion, were measured and examined from room temperature to 2000℃ by means of laser flash technique, quartz differential dilatometry and laser scanning method.The therural shock resistance properties of 3-D fine woven carbon-carbon composite and 2-D carbon cloth lay-up carbon-carbon composite were analyzed through the thermal shock resistance parameters.The effect of temperatures, densities as well as orientations on the thermat physical properties and thermal shock resistance properties were investigated.It is found that the coefficients of thermal conductivity of carbon-carbon composites decrease with increasing temperature tested.The higher the density the larger the coefficient of thermal conductivity.