考虑氧化损伤的陶瓷基复合材料弹性模量多尺度预测模型  

A multi-scale prediction model of elastic modulus for ceramic matrix composites considering oxidation damage

作　　者：李锦涛 王波[1,2] 杨扬 张程煜[3] LI Jintao;WANG Bo;YANG Yang;ZHANG Chengyu(School of Aeronautics,Northwestern Polytechnical University,Xi'an 710072,China;Shaanxi Key Laboratory of Impact Dynamics and Engineering Applications,Xi’an 710072,China;School of Materials Science and Engineering,Northwestern Polytechnical University,Xi’an 710072,China)

机构地区：[1]西北工业大学航空学院,西安710072 [2]陕西省冲击动力学及工程应用重点实验室,西安710072 [3]西北工业大学材料学院,西安710072

出　　处：《复合材料学报》2021年第10期3432-3442,共11页Acta Materiae Compositae Sinica

基　　金：国家重点研发计划(2017YFB1103504);国家自然科学基金(51572224)。

摘　　要：分析了化学气相渗透(CVI)工艺制备的陶瓷基复合材料的氧化损伤演化规律,基于基体的微裂纹分布规律及界面、纤维、基体等组分氧化历程,建立了考虑温度、氧化时间影响的纤维和单胞两个尺度的弹性模量预测模型。预测结果表明,碳纤维(C_(f))/SiC和SiC纤维(SiC_(f))/SiC复合材料的拉伸弹性模量随氧化温度升高和氧化时间的增长,下降趋势越明显。通过复合材料高温氧化后的力学性能试验,验证了弹性性能预测模型的正确性:BN界面的SiC_(f)/SiC材料在1 000℃不同时间氧化后预测结果与试验结果误差不超过2%;PyC界面的C_(f)/SiC在700℃不同时间氧化后预测结果与试验结果误差不超过7%。The oxidation damage evolution law of ceramic matrix composites prepared by chemical vapor infiltration(CVI) process was analyzed. Considering the effects of temperature and oxidation time, prediction models of elastic modulus about fiber and cell were established based on the distribution of microcracks in matrix and the oxidation process of interface, fiber and matrix. The prediction results show that the tensile elastic moduli of carbon fiber(C_(f))/SiC and SiC fiber(SiC_(f))/SiC composites decrease more obviously with the increase of temperature and oxidation time. The elastic prediction model was verified by the tensile tests of the composites after high temperature oxidation. The error between the prediction results and the test results of SiC_(f)/SiC composites with BN interphase after oxidation at 1 000 ℃ for different time is no more than 2%, and the error between the prediction results and the test results of C_(f)/SiC composites with PyC interphase after oxidation at 700℃ for different time is no more than 7%.

关 键 词：陶瓷基复合材料 化学气相渗透(CVI) 氧化 多尺度 弹性模量 

分 类 号：TB332[一般工业技术—材料科学与工程]