期刊
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
卷 39, 期 7, 页码 2277-2286出版社
ELSEVIER SCI LTD
DOI: 10.1016/j.jeurceramsoc.2019.02.037
关键词
Tantalum; Silicide ceramic coating; Oxidation; Slurry sintering; Pack cementation
资金
- National Science and Technology Major Project of China [0101040201]
- National Basic Scientific Research Project of China [JCKY20171108001]
- National Natural Science Foundation of China [U1637210]
- project of the Innovation-Driven Plan in Central South University [51271203]
To protect refractory metal against oxidation at ultra-high temperatures, a MoSi2-TaSi2 ceramic coating was prepared on a pure tantalum (Ta) substrate using a novel three-step process, which included dip-coating with a molybdenum slurry, vacuum sintering, and halide-activated pack cementation (HAPC). The original coating had a MoSi2-TaSi2 double-layer structure from the surface to the substrate. After oxidation at 1700 degrees C for 8 h in air, the coating exhibited a complex multi-layer structure composed of SiO2-Mo5Si3-MoSi2-(Mo,Ta)(5)Si-3-TaSi2-Ta5Si3 from the outer layer to the inner layer, due to the high-temperature phase transition and diffusion of Si and O. The coating effectively protected the Ta substrate at 1700 degrees C for 12 h without failure, thereby demonstrating great improvement to its service life in an ultra-high-temperature aerobic environment. The protective effect was attributed to the integrity of the ceramic coating and the formation of a dense, uniform SiO2 film that effectively lowered the inward oxygen diffusion rate.
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