Ultra-high temperature ceramic（UHTC） composites are widely used in high-temperature environments in aerospace applications. They experience extremely complex environmental conditions during service, including thermal, mechanical and chemical loading. Therefore, it is critical to evaluate the mechanical properties of UHTCs subject to an environment with elevated temperature, mechanical stress and oxygen. In this paper, an experimental investigation of the uniaxial tensile properties of a ZrB2-SiC-graphite subject to an environment with a simultaneously elevated temperature, mechanical stress and oxygen is conducted based on a high-temperature mechanical testing system. To improve efficiency, an orthogonal experimental design is used. It is suggested that the temperature has the most important effect on the properties, and the oxidation time and stress have an almost equal effect. Finally, the fracture morphology is characterized using scanning electron microscopy（SEM）, and the mechanism is investigated. It was concluded that the main fracture mode involved graphite flakes pulling out of the matrix and crystalline fracture, which indicates the presence of a weak interface in the composites.
类型: 期刊论文
作者: HAN XinXing,XU ChengHai,JIN Hua,XIE WeiHua,MENG SongHe
来源: Science China(Technological Sciences) 2019年08期
年度: 2019
分类: 工程科技Ⅱ辑,工程科技Ⅰ辑
专业: 材料科学,航空航天科学与工程
单位: National Key Laboratory of Science and Technology for National Defence on Advanced Composites in Special Environments,Harbin Institute of Technology
基金: supported by the National Natural Science Foundation of China(Grant Nos.11472092,11672088,11502058),the National Basic Research Program of China(Grant No.2015CB655200)
分类号: TB33;V25
页码: 1349-1356
总页数: 8
文件大小: 1044K
下载量: 13
本文来源: https://www.lunwen66.cn/article/94de24e1e56d5c90f59dea92.html