Moisture-induced delamination video of an oxidized thermal barrier coating

被引：19

作者：

Smialek, James L. ^{[1
]}

Zhu, Dongming ^{[1
]}

Cuy, Michael D. ^{[1
]}

机构：

[1] NASA, Glenn Res Ctr, Cleveland, OH 44135 USA

来源：

SCRIPTA MATERIALIA | 2008年 / 59卷 / 01期

关键词：

alumina scales; spallation; nickel alloys; hydrogen embrittlement; moisture effects;

D O I：

10.1016/j.scriptamat.2008.02.055

中图分类号：

TB3 [工程材料学];

学科分类号：

0805 ; 080502 ;

摘要：

Physical vapor deposited thermal barrier coatings (TBCs) were thermally cycled to near-failure at It 50 degrees C. Normal failure occurred after 200-300 1 h cycles with only moderate weight gains (0.5 Mg cm(-2)). Delamination and buckling was often delayed until well after cooldown (desktop spallation), but could be instantly induced by the application of water drops, as shown in an accompanying video-recording. Moisture therefore plays a primary role in delayed desktop TBC failure. Hydrogen embrittlement is proposed as the underlying mechanism. Published by Elsevier Ltd. on behalf of Acta Materialia Inc.

引用

页码：67 / 70

页数：4

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