期刊
SURFACE & COATINGS TECHNOLOGY
卷 270, 期 -, 页码 314-323出版社
ELSEVIER SCIENCE SA
DOI: 10.1016/j.surfcoat.2015.02.014
关键词
Glass-based composite TBC; Pre-oxidation; Oxidation; TGO; Interfacial reaction; Gahnite interlayer
资金
- National High Technology Research and Development Program of China (863 Program) [2012AA03A512]
- National Key Basic Research Program of China (973 Program) [2012CB625100]
A novel thermal barrier coating (TBC) of glass-based composite with inclusions of Nickel, Y-PSZ, and corundum particles was prepared by sintering on K417G superalloy with a NiCoCrAlY bond-coat (BC). Aiming at prohibiting the interfacial reactions between BC and the composite top-coat (TC), pre-oxidation process of BC was carried out to form a continuous alpha-Al2O3 scale. However, a very thin but continuous layer of gahnite formed at the alpha-Al2O3 scale/TC interface as a result of their interfacial reactions during oxidation. Thus, the original unstable alpha-Al2O3/TC interface was replaced by the inactive gahnite/TC interface. Because of the extra protection of the gahnite interlayer as well as the barrier effect of the TC on oxygen permeation, the alpha-Al2O3 scale thickened very slowly, which made the composite TBC exhibit better oxidation resistance than the NiCoCrAlY coating at 1000 degrees C. (C) 2015 Elsevier B.V. All rights reserved.
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