Bimodal microstructure ZrB2-MoSi2 coating prepared by atmospheric plasma spraying for carbon/carbon composites against long-term ablation |
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| Affiliation: | 1. School of Materials and Mechanical Engineering, Jiangxi Science and Technology Normal University, Nanchang 330013, PR China;2. National Engineering Laboratory for Modern Materials Surface Engineering Technology; The Key Lab of Guangdong for Modern Surface Engineering Technology; Guangdong Institute of New Materials, Guangzhou 510651, PR China;3. School of Materials Science and Engineering, Central South University, Changsha 410083, PR China;1. Shenyang National Laboratory for Materials Science, Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110016, China;2. School of Materials Science and Engineering, University of Science and Technology of China, Shenyang 110016, China;1. AML, Department of Engineering Mechanics, School of Aerospace Engineering, Tsinghua University, Beijing 100084, PR China;2. Institute of Advanced Structure Technology, Beijing Key Laboratory of Lightweight Multi-functional Composite Materials and Structures, Beijing Institute of Technology, Beijing 100081, PR China;3. Science and Technology on Advanced Composites in Special Environment Laboratory, Harbin Institute of Technology, Harbin 150001, PR China;4. College of Engineering, Peking University, Beijing 100871, PR China;5. State Key Laboratory of Explosion Science and Technology, Beijing Institute of Technology, Beijing 100081, PR China;1. Department of Mining and Metallurgical Eng, Amirkabir University of Technology, Tehran, Iran;2. Ceramic Department, Materials and Energy Research Center, Karaj, Iran |
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| Abstract: | To protect carbon/carbon composites against long-term ablation, a bimodal microstructure ZrB2-MoSi2 coating, consisting of an outer ZrB2-MoSi2 layer modified by Y2O3 and an inner basal ZrB2-MoSi2 layer, was prepared by atmospheric plasma spraying. The microstructure, phase composition and ablation resistance of the proposed coating were investigated in detail. Results showed that the bimodal coating maintained integrity in structure except for phase composition. There was no visible interlayer between the inner ZrB2-MiSi2 layer and the outer modified one. Mass ablation rate of the bimodal microstructure ZrB2-MoSi2 coated C/C composites was ?2.02 × 10?3 g/s under an oxyacetylene flame ablation at 1873 K for 600 s, which exhibited better ablation resistance than a single ZrB2-MoSi2 coating. The excellent ablation resistance was ascribed to the positive effect of Y2O3, which not only pined in the glassy phase and alleviated the volatilization of SiO2 glass phase by reacting with SiO2 to form high viscosity of Y2SiO5, but also stabilized ZrO2 and promoted its recrystallization and growth. |
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| Keywords: | C/C composite Atmospheric plasma spraying Coating Ablation |
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