材料科学与工程学报2025，Vol.43Issue(1)：68-73,104,7.DOI:10.14136/j.cnki.issn1673-2812.2025.01.010
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
摘要
Abstract
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Key words
Aeroengine/CMC/2D SiC/SiC composites/Fatigue properties/Fracture morphology分类
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陈易诚,邓杨芳,王红彬,于国强,高希光,宋迎东..环境温度对二维编织SiC/SiC复合材料拉-拉疲劳性能的影响[J].材料科学与工程学报,2025,43(1):68-73,104,7.基金项目
江苏省自然科学基金项目(BK20230326) （BK20230326）
