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结合复合材料氧化质量损失率模型和混合率公式,发展了单向C/SiC复合材料在无应力氧化下的弹性模量预测方法。对400～700℃和700～900℃两种氧化机制下C/SiC复合材料的弹性模量进行了预测,分析了氧化温度、氧化时间和纤维体积含量对C/SiC复合材料弹性模量的影响。开展了单向C/SiC复合材料在650℃和800℃空气环境下的无应力氧化试验,建立了复合材料质量损失率与氧化时间的变化关系,得到了氧化后材料拉伸应力-应变曲线。同时,将理论预测值与试验结果进行对比,发现理论值与试验值基本吻合,从而验证了该方法能够有效地预测无应力氧化下陶瓷基复合材料的弹性性能。
Combined with the mass loss rate model and mixing rate formula, the elastic modulus prediction method of unidirectional C / SiC composites under unstressed oxidation was developed. The elastic modulus of C / SiC composites under two oxidation mechanisms of 400 ~ 700 ℃ and 700 ~ 900 ℃ were predicted. The effects of oxidation temperature, oxidation time and fiber volume content on the elastic modulus of C / SiC composites . Uniaxial C / SiC composites were tested at 650 ℃ and 800 ℃ in air. The relationship between the mass loss rate and the oxidation time was established. The tensile stress-strain curve was obtained. At the same time, the theoretical predictions and experimental results were compared and found that the theoretical value and experimental values are basically consistent, thus verifying the method can effectively predict the elastic properties of ceramic matrix composites without stress oxidation.