期刊
JOURNAL OF ALLOYS AND COMPOUNDS
卷 685, 期 -, 页码 316-321出版社
ELSEVIER SCIENCE SA
DOI: 10.1016/j.jallcom.2016.05.272
关键词
Thermal barrier coatings; LaMgAl11O19; CMAS; Hot corrosion
资金
- National Natural Science Foundation of China (NSFC) [51002038, 51321061]
Hot corrosion is one of the significant failure mechanisms in hot-section components, especially when molten CaO-MgO-Al2O3-SiO2 (CMAS) deposits attack the thermal barrier coating and facilitate its degradation at elevated temperatures. This work concentrates on the hot corrosion behavior of LaMgAl11O19 ceramic as a promising candidate for TBCs after exposure to CMAS at 1250 degrees C for 1-16 h in air. The phase constituents and morphologies of the hot corrosion products were investigated by X-ray diffraction and scanning electron microscopy, respectively. Energy-dispersive X-ray spectroscopy was employed for elemental and microstructure analysis. The corrosion products are identified to be CaAl2Si2O8 and Ca(Mg,Al)(Al,Si)(2)O-6 due to the interaction between LaMgAl11O19 ceramic and melt-CMAS by dissolution-reprecipitation. The hot corrosion mechanism was further proposed based on the phase diagram. (C) 2016 Elsevier B.V. All rights reserved.
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