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The axial thermal conductivity of high-modulus carbon fibers near room temperature is determined from the measured thermal conductivity of their unidirectional composites and also directly on a dry fiber bundle. A device providing the necessary thermal and electrical connections to the heated fiber bundle is described.
The thermal conductivity of 14 commercial carbon fiber grades ranged from 1.42 W/cm °C for the highest-modulus (GY-70) fiber to 0.03 for the low-modulus (VYB) one. Correlations are given between the thermal and the electrical conductivities and the fiber moduli. Above 0.1 W/cm °C the thermal conductivity increases linearly with the electrical conductivity or the elastic modulus, whereas below that value it becomes nearly independent of modulus, and is accompanied by a sharply decreased electrical conductivity.
composite materials, carbon fibers, fibers, fiber composites, graphite composites, reinforced plastics, thermal conductivity, electrical conductivity, electrical resistivity, density, stiffness, test equipment
Research associate, Celanese Research Co., Summit, N.J.