2.5D衍生结构SiO_(2f)/SiO_2复合材料的经向力学性能

Mechanical Properties in Warp Direction of 2. 5D Derived Structures SiO_(2f)/SiO_2 Composites

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。

Several 2. 5D derived structures Si O2f/ Si O2 composites were fabricated by sol-gel using warp-laid-in2. 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 Si O2f/ Si O2 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 / cm^3） increased by 4. 3 times compared with prior high density 2. 5D composite（ 1. 65 g / cm^3）.