期刊
CORROSION SCIENCE
卷 205, 期 -, 页码 -出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.corsci.2022.110417
关键词
Carbon; carbon composites; Silicon-based ceramic coating; Liquid silicon infiltration; Oxidation resistance; 1972 K
资金
- National Natural Science Foundation of China [52130205, 51727804, 91860203]
- National Key R & D Program of China [2021YFA0715803]
A dense Si-Cr-W multiphase ceramic coating was prepared on the surface of SiC coated C/C composites using a combined method of slurry brushing, heat treatment, and liquid silicon infiltration, which significantly enhanced the oxidation resistance of the composites at high temperatures. The coating possessed a dense and uniform multiphase mosaic structure and acted as an effective barrier against oxygen diffusion. It demonstrated outstanding high-temperature oxidation protective ability.
To obtain long-term oxidation protection for C/C composites at high temperatures, a dense Si-Cr-W multiphase ceramic coating was prepared on the surface of SiC coated C/C composites by a combined method of slurry brushing, heat treatment and liquid silicon infiltration, which drastically enhanced the oxidation resistance of SiC coated C/C composites at 1773 K and 1973 K in air. The microstructure evolution, phase composition and oxidation behavior of the multiphase coating were analyzed before and after oxidation. Results display that the Si-Cr-W coating with a thickness of - 115 mu m possessed a dense and uniform multiphase mosaic structure (WSi2, CrSi2, Cr5Si3, SiC and Si). The mass loss of the coated sample was only 1.08 mg/cm2 after oxidation for 325 h at 1773 K in air owing to the formation of the compact compound glass layer (SiO2, Cr2O3 and WO3) acted as an oxygen diffusion barrier. The coating can effectively protect C/C substrate from oxidation for 76 h at 1973 K in air, demonstrating its outstanding high-temperature oxidation protective ability.
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