Oxidation behavior of glass-based composite thermal barrier coating on K417G superalloy with a NiCoCrAlY bond coat at 1000 °C

被引：11
|
作者：
Wang, Xin [1 ]
Chen, Minghui [1 ]
Zhu, Shenglong [1 ]
Wang, Fuhui [1 ]
机构：
[1] Chinese Acad Sci, Inst Met Res, Shenyang 110016, Peoples R China
来源：
SURFACE & COATINGS TECHNOLOGY | 2015年 / 270卷
基金：
国家高技术研究发展计划(863计划);
关键词：
Glass-based composite TBC; Pre-oxidation; Oxidation; TGO; Interfacial reaction; Gahnite interlayer; HOT CORROSION BEHAVIOR; CERAMIC MATERIALS; K38G SUPERALLOY; TI6AL4V ALLOY; NACL DEPOSIT; CRYSTALLIZATION; MICROSTRUCTURE; INTERMETALLICS; PERFORMANCE; PROTECTION;
D O I：
10.1016/j.surfcoat.2015.02.014
中图分类号：
TB3 [工程材料学];
学科分类号：
0805 ; 080502 ;
摘要：
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.
引用
收藏
页码：314 / 323
页数：10
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