Long-term oxidation behaviors of Si-Cr-W multiphase coating on SiC coated C/C composites at 1773 K and 1973 K. (15th August 2022)

• Record Type: Journal Article
• Authors: Li, Tao; Zhang, Yulei; Lv, Junshuai; Fu, Yanqin; Li, Jiachen
• Is Part Of: Corrosion science. Volume 205(2022)
• Publication Date: 2022-08-15
• Subjects: Carbon/carbon composites -- Silicon-based ceramic coating -- Liquid silicon infiltration -- 1973 K -- Oxidation resistance; Corrosion and anti-corrosives -- Periodicals; 620.11223
• DOI: 10.1016/j.corsci.2022.110417
• Languages: English
• ISSNs: 0010-938X

Abstract

Abstract: 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 µm possessed a dense and uniform multiphase mosaic structure (WSi2, CrSi2, Cr5 Si3, SiC and Si). The mass loss of the coated sample was only 1.08 mg/cm 2 after oxidation for 325 h at 1773 K in air owing to the formation of the compact compound glass layer (SiO2, Cr2 O3 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. Highlights: A dense Si-Cr-W multiphase ceramic coating was prepared on the surface of SiC coated C/C composites. The Si-Cr-W coating with a thickness of ~ 115 µm possessed a dense and uniform multiphase mosaic structure. The coating can effectively protect C/C substrate from oxidation for 76 h at 1973 K in air.