材料科学
复合材料
抗压强度
升华(心理学)
介观物理学
焦耳加热
心理学
量子力学
物理
心理治疗师
作者
Chenghai Xu,Fajun Yi,Sheng Meng,Yanyan Huo,Xianhong Han,Qiang Yang
标识
DOI:10.1016/j.jeurceramsoc.2022.05.008
摘要
Carbon/Carbon (C/C) composites are expected to serve as structural materials over 2800 ℃. Experiments under ultra-high temperatures (UHT) are critical and demanding. In this paper, we established the UHT compressive experiment technique using simultaneous Joule heating and compressive loading fixtures. The specimen was designed and validated to achieve uniform temperature and strain at the gauge section. Compressive strengths and failure behaviors of three-directional (3D) needled, 3D woven, and four-directional (4D) woven C/C composites under UHT up to 3100 ℃ were investigated. The failure modes and mechanism of strength differences were illustrated through mesoscopic surface morphologies. Results showed that the dog-bone-shaped specimen avoided crushing at loading ends and exhibited failure at gauge sections. Temperatures with peak compressive strengths for 3D and 4D woven C/C composites were determined. Differences between the C/C composites were related to heat treatment temperatures. The sublimation phenomenon was observed for 4D woven C/C composites over 3000 ℃, degrading the compressive strengths by over 50%.
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