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使用不同织造方式(二维机织,法向增强2.5维机织和三维五向编织)制备了3种SiC纤维预制体,采用树脂转移模塑(RTM)和聚合物浸渍裂解(PIP)工艺制备了SiC_f/PyC/SiBCN复合材料。观察复合材料的显微组织,测试弯曲强度、拉伸强度、压缩强度等力学性能,探究不同预制体结构对复合材料力学性能的影响行为。结果表明:同一预制体结构在不同方向的纤维分布不同导致材料力学性能的各向异性;不同预制体结构对材料力学性能有着显著的影响。
Three kinds of SiC fiber preform were prepared by different weaving methods (two-dimensional weave, normal reinforced 2.5-dimensional weave and three-dimensional five-directional weave), which were prepared by resin transfer molding (RTM) and polymer impregnation cracking SiC_f / PyC / SiBCN composites. The microstructure of the composites was observed and the mechanical properties such as flexural strength, tensile strength and compressive strength were tested. The effect of different preform structures on the mechanical properties of the composites was investigated. The results show that the different fiber distribution in the same preform structure leads to anisotropy of the mechanical properties of the material. Different preform structures have a significant effect on the mechanical properties of the material.