采用国产KD-I型SiC纤维为增强体,通过先驱体转化工艺制备了SiC/SiC复合材料.研究了二维织物和针刺毡等纤维排布方式对复合材料显微结构和物理以及力学性能的影响.结果表明,与针刺毡增强SiC/SiC复合材料相比,2D SiC/SiC复合材料的纤维体积分数和密度较高、孔隙率低、所需制备时间短、成本低、面内性能好,但同时损失了Z向性能.在不同工况下应用的SiC/SiC复合材料应根据具体使用要求来选择纤维排布方式.
Using KD-I type SiC fiber as the reinforcement, the KD-1/SiC composites were fabricated by precursor infiltration and Pyrolysis (PIP) technique. The dependences of the microstructure and other properties of the composites on the distribution manner of fiber such as both 2D fabric and needle punching felt were investigated. The results show that, compared with the needle punching felt reinforced SiC/SiC composites, the 2D SiC/SiC composites own many merits, such as high fiber volume fraction and density, high plane properties, low porosity, low cost and short periodic time of preparation. However, the Z-directional properties are sacrificed. Therefore we should choose different distribution manner of SiC fiber based on varying specific operating requirements of the SiC/SiC composites.
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