Experimental Determination and Control of Thermal Conductivity of the Carbon Composite Materials with the Increased Conductivity

Abstract

The paper considers a method for experimental determination and control of the thermal conductivity homogeneity in the reinforcement plane along the fiber layout direction for the anisotropic composite radiators in the thin-walled plate form following the experimentally measured temperature-coordinate dependences. The method is based on solving the problem of thermal conductivity in a rib with the constant cross section under radiative heat loss from the free surfaces. To implement this method, an experimental setup was developed using the UVM-15U vacuum chamber equipped with an adjustable-power electric heating element and the thermoscopic means for the samples under study. The paper presents results of experimental application of this method on the metal samples and a sample made of the polymer composite material reinforced with the high-modulus pitch fiber. The maximum temperature in the experiments was not exceeding 140 °C, which corresponded to operating temperatures of the modern spacecraft and electronic thermal control systems. The measured values of thermal conductivity for the samples made of the AMts aluminum and copper alloy coincided with the reference values of this characteristic; deviation was less than 5 %. For the studied sample made of the polymer composite material with the increased thermal conductivity, significant temperature heterogeneity in the transverse direction was observed, differences in computed values of the thermal conductivity quantitatively reached 100 %. The experimental data made it possible to determine heterogeneity of the sample internal structure; it was presumably associated with the carbon fibers damage

Please cite this article in English as:

Berdov R.D., Volkov N.N., Volkova L.I., et al. Experimental determination and control of thermal conductivity of the carbon composite materials with the increased conductivity. Herald of the Bauman Moscow State Technical University, Series Mechanical Engineering, 2025, no. 2 (153), pp. 4--19 (in Russ.). EDN: UHKIRK

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