Peili Hu, Zhongde Shan, Yong Zang, Feng Liu, Zheng Sun, Xiaochuan Wu

High Temperature Thermal Conductivity of Fiber Hybrid Ceramic Matrix Composites with Different Modes

  • Condensed Matter Physics
  • General Materials Science

Thermal conductivity (TC) is one of the important thermal property evaluation parameters for high temperature resistant fiber reinforced composites. In this work, based on the flexible‐oriented three‐dimensional (3D) woven technology, fiber hybrid ceramic matrix composites (FH‐CMCs) with different hybrid modes were designed and fabricated by using carbon fiber and silicon carbide fiber. The representative volume element (RVE) models of fiber bundle and matrix with mesoscopic characteristics and the macroscopic RVE models with hybrid structure characteristics were established. The heat flux distribution and effective TCs of FH‐CMCs in the thickness and in‐plane directions at different temperatures were obtained by finite element analysis (FEA) and experimental tests. The results show that the FEA and experimental results of the TCs of different FH‐CMCs are in good agreement. In the range of 25∽1000°C, the effective TCs of FH‐CMC gradually decrease with the increase of temperature. The TCs in the thickness direction of different FH‐CMCs are directly proportional to the hybrid ratio, and the TCs in the in‐plane direction are inversely proportional to the hybrid ratio. The heat flux and temperature field distributions of the FH‐CMCs are mainly affected by the TCs of the components, fiber hybrid ratio and orientation, and the distribution along different directions are obviously different. The research results are helpful to provide theoretical and experimental reference for the structural design and performance improvement of hybrid composites.This article is protected by copyright. All rights reserved.

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