A novel design of Al-Cr alloy surface sealing for ablation resistant C/C-ZrC-SiC composite |
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| Affiliation: | State key Laboratory of Powder Metallurgy, Central South University, Changsha 410083, China;State Key Laboratory of Powder Metallurgy, Central South University, Changsha, 410083, China;Materials Science Division, CSIR-National Aerospace Laboratories, Bangalore 560017, India;State Key Laboratory of Powder Metallurgy, Central South University, Changsha 410083, Hunan, China;State Key Laboratory of Powder Metallurgy, Central South University, Changsha 410083,China;State Key Laboratory of Powder Metallurgy, Central South University, Changsha 410083, China;State Key Laboratory of Solidification Processing, Carbon/Carbon Composites Research Center, Northwestern Polytechnical University, Xi’an, Shaanxi 710072, PR China |
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| Abstract: | To improve anti-ablation property of C/C-ZrC-SiC composite, a novel design of Al-Cr alloy surface sealing was performed by liquid melt impregnation. Results show that Al8Cr5 formed on the surface which could effectively seal the holes and cracks. The cooperation of metal and ceramics contribute a better anti-ablation performance to the obtained composite, and its mass and linear ablation rates decrease by 98.3% and 81.2% respectively. This special surface structure evolves into a highly dense oxide scale comprising various solid solutions (including Al-Cr-O, Al-Si-O, Cr-Si-O) and ZrO2, which could significantly improve the anti-ablation performance of C/C-ZrC-SiC composite. |
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| Keywords: | C/C composite Ultra-high temperature ceramics Surface sealing Al-Cr alloy Ablation |
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