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.