Mechanisms of spallation of electron beam physical vapor deposited thermal barrier coatings with and without platinum aluminide bond coat ridges

被引：49

作者：

Vaidyanathan, K

Gell, M ^{[1
]}

Jordan, E

机构：

[1] Univ Connecticut, Dept Met & Mat Engn, Storrs, CT 06269 USA

[2] Univ Connecticut, Dept Engn Mech, Storrs, CT 06269 USA

来源：

SURFACE & COATINGS TECHNOLOGY | 2000年 / 133卷

关键词：

thermal barrier coatings; spallation mechanisms; electron beam physical vapor deposition coatings; platinum aluminide coatings;

D O I：

10.1016/S0257-8972(00)00891-4

中图分类号：

TB3 [工程材料学];

学科分类号：

0805 ; 080502 ;

摘要：

Grain boundary ridges, that form on the surface of platinum aluminide [(Ni,Pt)Al] bond coats prior to the deposition of the yttria stabilized zirconia ceramic layer by the electron beam physical vapor deposition (EB-PVD) process, were shown to be the sites for spallation damage initiation in (Ni,Pt) Al/EB-PVD thermal barrier coatings. When these ridges are removed prior to deposition of the ceramic layer, a 3 x Life improvement is achieved. This study compares the spallation mechanisms in specimens with and without bond coat ridges, in order to explain the improvement in spallation life. (C) 2000 Elsevier Science B.V. All rights reserved.

引用

页码：28 / 34

页数：7

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Department of Metallurgy and Materials Engineering, University of Connecticut, Storrs, CT 06269, United States
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