期刊
CORROSION SCIENCE
卷 195, 期 -, 页码 -出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.corsci.2021.109983
关键词
Carbon/carbon composites; Compound glass coating; Micro-pores; Crack resistance; Oxidation resistance
资金
- National Natural Science Foundation of China [52130205, 51727804, 91860203]
By introducing micro-pores and compressive stress, the compound glass coating can effectively prevent the oxidation reaction of C/C composites in high-temperature environments, thus improving the stability and lifespan of the materials.
A compound glass coating with micro-pores, derived from the pre-oxidation of the porous HfSi2-SiC-Si coating, was fabricated on SiC-coated C/C composites. The coating resisted cracking by introducing micro-pores and compressive stress, which blocked oxygen diffusion and covered penetrable cracks in the SiC inner coating. A dual-layer structure for synergistic anti-oxidation was formed during oxidation at 1773 K and uniformly distributed Hf-oxides reduced the volatilization of SiO2 at 1973 K in the compound glass coating. Therefore, the coating could protect C/C composites against oxidation for 447 h at 1773 K and 45 h at 1973 K.
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