Thermal conductivity level improving for carboncarbon composite materials

Abstract

The carbon materials' thermal conductivity is the important factor supporting their resistance against the thermal shock. In the article the influence is regarded of the operational characteristics on the heat conductivity values reproduction when the three-dimensional reinforced highdensity carbon-carbon composite billets producing. More than 82 % of all billets had the average value of heat conductivity between 46 and 56 W/(m·K). The amount of all billets between 4,6 and 12,5 % had the values of heat conductivity between 44 and 70 W/(m·K). It was established that the treatment temperature's elevation from 1600 to 2400 °C can result in the heat conductivity rising by 0,21 W/(m·K) per each 100 °C. The difference in the frame structure can lead to the average heat conductivity's
variation within 3 W/(m·K). The variation of the apparent density level between 1,89 and 1,98 g/cm3 makes the heat conductivity change by 1,1 W/(m·K) per each 0,01 g/cm3
increment. The connection was found between the carboncarbon's electric conductivity ρ and heat conductivity λ which shape corresponds to the Wiedemann ‒ Frantz relation λ · ρ = const. Ill. 4. Ref. 18. Tab. 1.