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采用压力浸渗法制备单向M40+SiCp/ZM6复合材料。利用扫描电镜、透射电镜、拉伸试验机和热膨胀仪等分析测试手段研究了SiC颗粒混杂对复合材料微观组织、力学性能及热膨胀系数的影响。结果表明,SiC与ZM6发生界面反应,生成羽毛状的NdSi2界面反应物,提高界面润湿性。SiC颗粒混杂可以提高复合材料力学性能,使复合材料纵向热膨胀系数升高,横向热膨胀系数降低。用文中提出的热膨胀系数计算方法,可以准确计算单向碳纤维与SiC颗粒混杂增强复合材料在20~150℃范围内的平均热膨胀系数。
Preparation of unidirectional M40 + SiCp / ZM6 composites by pressure impregnation. The effects of SiC particle mixture on the microstructure, mechanical properties and thermal expansion coefficient of the composites were investigated by means of scanning electron microscopy, transmission electron microscopy, tensile testing machine and thermal dilatometer. The results show that interfacial reaction occurs between SiC and ZM6 to form feathery NdSi2 interfacial reactants to improve interfacial wettability. SiC particle hybrid can improve the mechanical properties of composite materials, so that the longitudinal thermal expansion coefficient of composite materials increased, the horizontal thermal expansion coefficient decreased. The calculation method of thermal expansion coefficient proposed in this paper can accurately calculate the average coefficient of thermal expansion of unidirectional carbon fiber and SiC particle hybrid reinforced composites in the range of 20-150 ℃.