Abstract The present study explored the effect of medium texture (MT) content on flexural properties and thermal expansion coefficients (CTES) of carbon/carbon (C/C) composites with multilayered pyrolytic carbon. The specimen with 39% MT exhibited maximum flexural strength of 221.55 MPa, increasing by 52% compared with pure high texture. While the flexural strength decreased when the MT content exceeded 39%. The excellent strength can be attributed to crack deflection between multilayered texture and the strong interface bonding between fibers and matrix. Moreover, the four specimens expressed a similar trend of CTES in the direction of XY and Z. In the direction of XY, the specimen with 39% MT had the lowest CTES from 800 °C to 2100 °C. Therefore, the C/C composites with 39% MT have the best mechanical and thermal expansion properties, which means that the properties of C/C composites can be optimized by controlling the texture.

中文翻译：

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通过控制纹理优化碳/碳复合材料的机械和热膨胀性能

摘要 本研究探讨了中等织构 (MT) 含量对具有多层热解碳的碳/碳 (C/C) 复合材料的弯曲性能和热膨胀系数 (CTES) 的影响。含 39% MT 的试样的最大弯曲强度为 221.55 MPa，与纯高织构相比提高了 52%。而当MT含量超过39%时，抗弯强度下降。优异的强度可归因于多层纹理之间的裂纹偏转以及纤维与基体之间的强界面结合。此外，四个试样在 XY 和 Z 方向上表现出相似的 CTES 趋势。在 XY 方向上，具有 39% MT 的试样在 800°C 到 2100°C 之间具有最低的 CTES。因此，含 39% MT 的 C/C 复合材料具有最佳的机械和热膨胀性能，