期刊
JOURNAL OF THE AMERICAN CERAMIC SOCIETY
卷 98, 期 5, 页码 1642-1649出版社
WILEY-BLACKWELL
DOI: 10.1111/jace.13478
关键词
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资金
- Office of Naval Research [N00014-08-1-0522]
- NSF by NSF MRSEC Program [DMR 1121053]
- International Center for Materials Research through the UCSB-MPG Program for International Exchange in Materials Science [NSF-DMR 0843934]
- Division Of Materials Research
- Direct For Mathematical & Physical Scien [0843934] Funding Source: National Science Foundation
The melting and crystallization behaviors of model calcium-magnesium-alumino-silicate (CMAS) compositions relevant to the degradation of thermal barrier coatings (TBCs) were investigated. A primary goal was to establish a baseline for studies on CMAS reactions with TBC materials, reported separately, and their potential to mitigate degradation. Ternary calcium alumino-silicate (CAS) compositions investigated melt below their equilibrium solidus owing to their metastable phase constitution. Additions of MgO or FeOx have significant effects on the melting behavior, depending on the C:A:S proportions. Amorphization on cooling is commonplace, with MgO, AlO1.5, and especially FeOx promoting crystallization. The behaviors of amorphous and crystalline versions of the same CMAS are different and depend on heating/ cooling rates, with attendant implications for their interaction with TBCs.
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