Influence of Thermal Shock on the Mechanical Behavior of Si-SiC Coated Carbon/Carbon Composites |
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Authors: | Qiangang Fu Hejun Li Yongjie Wang Kezhi Li and Lu Wei |
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Affiliation: | C/C Composites Research Center, Northwestern Polytechnical University, Xi0an 710072, China |
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Abstract: | Si-SiC coating was prepared on the surface of carbon/carbon (C/C) composites by a two-step technique of pack cementation, and the influences of thermal shock between 1773 K and room temperature in air on the mechanical property and fracture behavior of the coated C/C were studied. The results show that, after thermal shock between 1773 K and room temperature for 5, 10 and 15 times, the flexural strength of coated composites increases by 4.29%, 15.00% and 24.20%, respectively. The toughness of the coated C/C enhances gradually during the thermal shock test. The improvement of the mechanical property after the thermal shock test is primarily caused by the weakening of the fiber-matrix interface and the reduction of residual thermal stresses by thermal shock. |
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Keywords: | Carbon/carbon composites Coating Mechanical behavior |
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