Resistance to oxidation and ablation of SiC coating on graphite prepared by chemical vapor reaction |
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| Affiliation: | 1. State Key Laboratory of Powder Metallurgy, Central South University, Changsha 410083, PR China;2. School of Metallurgical Science and Engineering, Central South University, Changsha 410083, PR China;1. School of Electromechanical Engineering, Guangdong University of Technology, No. 100 Waihuan Xi Road, Guangzhou Higher Education Mega Center, Panyu District, Guangzhou 510006, PR China;2. State Key Laboratory for Powder Metallurgy, Central South University, Changsha 410083, PR China;3. Department of Physics, University of the Punjab, Quaid-i-Azam Campus, Lahore 54590, Pakistan;1. Key Laboratory of Lightweight High Strength Structural Materials, Central South University, Changsha, 410083, China;2. School of Resources and Safety Engineering, Central South University, Changsha, 410083, China |
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| Abstract: | A thick SiC coating was prepared on graphite by chemical vapor reaction. The coating reveals a typical crystalline structure with limited porosity and combines well with the substrate. Oxidation tests demonstrate that the coating has a weak self-healing ability at 1100 K and good self-healing ability at temperatures from 1623 to 1823 K. An oxyacetylene torch test verifies that the prepared coating can effectively protect graphite from ablation for 50 s. After the ablation test, the silica microspheres and other interesting silica structures such as microwires, microparticles, microflowers, nanowires and nanoparticles are formed at the ablation center and its surroundings. |
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| Keywords: | A Ceramic B Weight loss C High temperature corrosion C Oxidation |
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