Blistering of MCrAlY-coatings in H2/H2O-atmospheres

被引：24
|
作者：
Subanovic, M. [1 ]
Naumenko, D. [1 ]
Kamruddin, M. [2 ]
Meier, G. [3 ]
Singheiser, L. [1 ]
Quadakkers, W. J. [1 ]
机构：
[1] Forschungszentrum Julich, IEF 2, D-52425 Julich, Germany
[2] Indira Gandhi Ctr Atom Res, Met & Mat Grp, Kalpakkam 603102, Tamil Nadu, India
[3] Univ Pittsburgh, Dept Mech Engn & Mat Sci, Pittsburgh, PA USA
来源：
CORROSION SCIENCE | 2009年 / 51卷 / 03期
关键词：
Oxidation; Hydrogen embrittlement; Hydrogen absorption; High-temperature corrosion; Rare earth elements; THERMAL BARRIER COATINGS; ALUMINA-FORMING ALLOYS; WATER-VAPOR; HIGH-TEMPERATURE; OXIDATION BEHAVIOR; HYDROGEN; MICROSTRUCTURE; SOLUBILITY; DIFFUSION; PROGRESS;
D O I：
10.1016/j.corsci.2009.01.008
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
The oxidation behavior of vacuum plasma sprayed, free-standing MCrAlY-coatings was studied in Ar-20%O-2 and Ar-4%H-2-2%H2O. During exposure in Ar-4%H-2-2%H2O the coating formed large "blisters". This phenomenon was attributed to H-2-gas evolution within the coating, creating high pressures sufficient for coating plastic deformation as a result of atomic hydrogen recombination on coating defects. It is suggested that the hydrogen is produced at the scale/metal interface by reaction of H2O-vapor with yttrium and aluminium present in the coating. (C) 2009 Elsevier Ltd. All rights reserved.
引用
收藏
页码：446 / 450
页数：5
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