The thermal conductivities of 2.5 dimensional (2.5D) woven composites were measured by using transient hot-wire method (THWM) in this study. The results showed that the THWM could also be used to measure the thermal conductivity of 2.5D woven composites, which were considered to be homogeneous materials. Heat diffusion models of the samples were simulated. The thermal conductivities of 2.5 dimensional woven composites increased with the warp fibre volume fraction when the hot wire was perpendicular to the warp direction. It was important that the thermal conductivity of 2.5 dimensional woven composites was found to be affected by the yarn size. Thermal conductivities also increased with the effective yarn size. Finally, thermal conductivities of 2.5 dimensional woven composites increased with the temperature from 288.15K to 298.15K, although the enhancement was not great. These conclusions indicated that the thermal conductivity of 2.5 dimensional woven composites was affected by the internal structure and the external environment.
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