Structural evolution and mechanical properties of Cansas-III SiC fibers after thermal treatment up to 1700 °C |
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Authors: | Yihan Chen Zhaoke Chen Ruiqian Zhang Zongbei He Ming Li Xiang Xiong |
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Affiliation: | 1. Science and Technology on High Strength Structural Materials Laboratory, Central South University, Changsha, 410083, China;2. State Key Laboratory of Powder Metallurgy, Central South University, Changsha, 410083, China;3. Science and Technology on Reactor Fuel and Materials Laboratory, Nuclear Power Institute of China, Chengdu, 610213, China |
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Abstract: | The effects of thermal treatment on the Cansas-Ⅲ SiC fibers were investigated via heating at temperatures from 900 to 1700 ℃ for 1–5 h in argon atmosphere. The composition and morphology of the SiC fibers were characterized and the tensile strength of the SiC fiber bundles was analyzed via two-parameter Weibull distribution analysis. The results showed that the thermal treatment has negligible influence on the microstructure of the SiC fibers at temperatures ≤ 1100 ℃. At temperatures ≥ 1300 ℃, the surface of the fibers became rough with some visible particles. Particularly, at 1700 °C, numbers of holes appeared. With the increasing of heating temperature and holding time, the average tensile strength of the SiC fibers decreased gradually from 1.81 to 1.01 GPa. The decreasing of tensile strength can be attributed to the increase of critical defect sizes, grain growth and phase transformation (β→α) of SiC. |
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Keywords: | Cansas-Ⅲ SiC fibers Thermal treatment Microstructure Tensile strength Weibull distribution |
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