论文部分内容阅读
采用先驱体转化法制备了2.5维石英纤维织物增强氮化物陶瓷基复合材料。对所制备材料的力学性能、热物理性能、烧蚀性能和断口显微形貌进行了研究。研究了裂解温度及纤维体积含量对复合材料抗弯强度的影响。结果表明:该材料具有较好的力学性能和优良的抗烧蚀性能,随着纤维体积含量的提高,复合材料的抗弯强度随之提高。当纤维体积分数为48%,裂解温度为800℃时,复合材料显示出最高径向抗弯强度(134.6MPa)。烧蚀过程中无分层和剥离现象,表面平整,线烧蚀率为0.038mm/s。材料的增韧机制是基体与纤维界面的脱粘和纤维的拔出吸收了大量的能量。
2.5-D quartz fiber fabric reinforced nitride ceramic matrix composites were prepared by the precursor transformation method. The mechanical properties, thermophysical properties, ablation properties and fracture micro-morphology of the prepared materials were studied. The effects of cracking temperature and fiber volume content on the flexural strength of the composites were investigated. The results show that the material has good mechanical properties and excellent ablation resistance. With the increase of fiber volume fraction, the flexural strength of the composites increases. When the fiber volume fraction is 48% and the pyrolysis temperature is 800 ℃, the composites show the highest radial bending strength (134.6 MPa). No ablation and delamination during the ablation process, the surface is smooth, the ablation rate is 0.038mm / s. Toughening mechanism of the material is the matrix and the fiber interface debonding and fiber pull out to absorb a lot of energy.