Stressed-oxidation behavior of 2D CVI SiC/BN/SiC at elevated temperature in air. Issue 20 (15th October 2021)

• Record Type: Journal Article
• Authors: Han, Xiao; Pan, Rong; Shi, Jian; Yu, Guoqiang; Song, Fangxiao; Gao, Xiguang; Song, Yingdong; Wang, Fang
• Is Part Of: Ceramics international. Volume 47:Issue 20(2021)
• Page Start: 28158
• Page End: 28166
• Publication Date: 2021-10-15
• Subjects: SiC/BN/SiC composites -- Intermediate temperature -- Stressed-oxidation behavior -- Strain-time curve -- Failure mechanism; Ceramics -- Periodicals; Céramique industrielle -- Périodiques; Ceramics; Periodicals; Electronic journals; 666
• DOI: 10.1016/j.ceramint.2021.06.082
• Languages: English
• ISSNs: 0272-8842

Abstract

Abstract: The stressed-oxidation behaviors of 2D woven SiCf/BN/SiC composites were investigated at 950 °C and 1100 °C in air. The different proportions (60%–90%) of the ultimate tensile strength (UTS) at corresponding temperatures were chosen as constant stress. The stressed-oxidation experiments were taken to failure or interrupted (240h). The UTS decreases by 20.75% at 950 °C and 30.71% at 1100 °C. The composites did not fail during stressed oxidation when subjected to constant stress corresponding to the initial linear and the beginning of nonlinear segments of the tensile curve, above which the composites failed with a maximum failure life of about 10h. Fiber degradation due to the thermal exposure and the fiber cracks caused by the oxidation of BN interface coating and SiC fiber could be responsible for the strength degradation and failure of the composites during stressed oxidation.