根据二维编织C/SiC复合材料的细观结构及其制备工艺特点,提出了一种预测该材料面内热膨胀系数的单胞模型.模型充分考虑了编织结构复合材料中的纤维束弯曲和CVI工艺制备陶瓷基复合材料产生的孔洞对热膨胀系数的影响.利用单胞模型预测了二维编织C/SiC的结构参数、纤维体积含量、孔洞含量对复合材料热膨胀系数的影响规律,结果表明:随着纤维束扭结处产生间隙与纱线宽度比值的增大,热膨胀系数增大;当其它参数不变时,随着纤维体积含量的增大,热膨胀系数反而下降;随着孔洞含量的增加,热膨胀系数也出现了下降的趋势.利用DIL402C热膨胀仪测试了二维编织C/SiC复合材料纵向热膨胀系数,试验结果与模型预测结果吻合较好.
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