2. 5D 衍生结构SiO2 f / SiO2 复合材料的经向力学性能

以几种不同的2.5D衍生结构织物为增强体,制备了法向增强、经向增强及经法向增强2.5D Si O2f/Si O2复合材料,比较了上述材料与现有2.5D Si O2f/Si O2复合材料的经向力学性能,并研究了经法向增强2.5D结构复合材料中增强纱比例、纤维体积分数与材料性能之间的关系,对织物结构进行了优化。结果表明,经法向增强2.5D Si O2f/Si O2复合材料的经向力学性能较现有2.5D复合材料有显著提高,该材料在较低密度下(1.6 g/cm3),经向拉伸强度与现有材料(1.65 g/cm3)持平,且经向压缩强度接近现有材料的4.3倍。

Mechanical Properties in Warp Direction of 2. 5D Derived Structures SiO2f / SiO2 Composites

Several 2. 5D derived structures SiO2f / SiO2 composites were fabricated by sol-gel using warp-laid-in 2. 5D woven structure,z-laid-in 2. 5D woven structure and warp & z-laid-in 2. 5D woven structure. The mechanical properties in the warp direction between these composites and prior 2. 5D SiO2f / SiO2 composite were compared in this paper, and so the effects of the straight warp yarn proportion and fiber volume fraction on the mechanical properties. The fiber reinforcement architecture of warp & Z-laid-in 2. 5D fabric was optimized on this basis. The results show that the mechanical properties of composites in the warp direction have been improved obviously by using warp & Zlaid- in 2. 5D fabric as the reinforcement. While the longitudinal tensile strength remained basically unchanged, the longitudinal compressive strength of the low density composites (1. 6g/ cm3 ) increased by 4. 3 times compared with prior high density 2. 5D composite (1. 65g/ cm3).