环境温度对二维编织SiC/SiC复合材料拉-拉疲劳性能的影响  

Effects of Ambient Temperature on Tension-tension Fatigue Properties of 2D SiC/SiC Composites

作　　者：陈易诚 邓杨芳 王红彬 于国强[3] 高希光[3] 宋迎东[3] CHEN Yicheng;DENG Yangfang;WANG Hongbin;YU Guoqiang;GAO Xiguang;SONG Yingdong(AECC Sichuan Gas Turbine Establishment,Chengdu 610500,China;Pipe China West East Gas Pipeline Company,Shanghai 200122,China;College of Energy and Power Engineering Nanjing University of Aeronautics and Astronautics,Nanjing 210016,China)

机构地区：[1]中国航发四川燃气涡轮研究院,四川成都610500 [2]国家石油天然气管网集团有限公司西气东输分公司,上海200122 [3]南京航空航天大学能源与动力学院,江苏南京210016

出　　处：《材料科学与工程学报》2025年第1期68-73,104,共7页Journal of Materials Science and Engineering

基　　金：江苏省自然科学基金项目(BK20230326)。

摘　　要：为了研究环境温度对陶瓷基复合材料疲劳性能的影响,在室温和800℃、1000℃、1200℃氩气环境下开展了二维编织SiC/SiC复合材料的拉-拉疲劳实验。获取了四种温度条件下二维编织SiC/SiC复合材料的S-N曲线。基于实验结果分析了室温环境与高温环境下材料疲劳特性的差异以及材料疲劳极限随实验温度的变化规律。在光学显微镜下对不同温度条件下的试件断口进行了观察。结果表明:800℃以上高温氩气环境下二维编织SiC/SiC复合材料的疲劳极限应力要大幅低于室温环境,并且800℃、1000℃、1200℃三种温度下材料的疲劳极限应力呈现出随温度升高而阶梯下降的规律。室温环境下材料失效前的最大应变在0.41%左右,800℃~1200℃范围内材料失效前的最大应变在0.2%左右。高温条件下疲劳断裂试件断口纤维拔出现象较室温试件明显,并且纤维拔出程度会随着温度的升高而加剧。实验结果证明在惰性气体环境下温度仍对二维编织SiC/SiC复合材料的疲劳性能起着决定性的作用。最大应变数据可用于判断材料的疲劳损伤程度。高温条件下二维编织SiC/SiC复合材料内部界面性能会出现衰退导致材料的疲劳性能下降。To investigate the effects of environmental temperature on the fatigue performance of ceramic-matrix composites(CMC),tension-tension fatigue tests were conducted on 2D SiC/SiC composites under argon atmosphere at room temperature and elevated temperatures of 800℃,1000℃,and 1200℃.The S-N curves of 2D SiC/SiC composites were obtained under different temperature.Based on the test results,the difference of fatigue characteristics of 2D SiC/SiC composites at room temperature and elevated temperature environments and the variation law of fatigue limit with test temperature were analyzed.The fractures of the specimens under different temperatures were observed by microscope.The results show that the fatigue limit stress of 2D SiC/SiC composites above 800℃is significantly lower than that at room temperature,and the fatigue limit stress of the material exhibited a stepwise degradation trend with increasing temperature at 800℃,1000℃,and 1200℃under argon atmosphere.The maximum strain before fatigue failure at room temperature is about 0.41%,and the maximum strain before fatigue failure in the temperature range of 800-1200℃is about 0.2%.Under elevated temperature conditions,the phenomenon of fiber extraction at the fracture of fatigue specimens is more obvious than that of at specimens,and the degree of fiber extraction will increase with the increase of temperature.The test results show that fatigue properties of 2D SiC/SiC composites under an inert gas are decisively influenced by temperature.The maximum strain data can be used to determine the degree of fatigue damage of the material.Under elevated temperatures,the internal interface properties of 2D SiC/SiC composites will deteriorate,resulting in a decrease in the fatigue properties of the materials.

关 键 词：航空发动机 陶瓷基复合材料 二维编织SiC/SiC复合材料 疲劳性能 断口形貌 

分 类 号：V231.1[航空宇航科学与技术—航空宇航推进理论与工程]