Observation of subcritical spall propagation of a thermal barrier coating

被引：96

作者：

Sergo, V ^{[1
]}

Clarke, DR ^{[1
]}

机构：

[1] Univ Calif Santa Barbara, Coll Engn, Dept Mat, Santa Barbara, CA 93106 USA

来源：

JOURNAL OF THE AMERICAN CERAMIC SOCIETY | 1998年 / 81卷 / 12期

关键词：

D O I：

10.1111/j.1151-2916.1998.tb02761.x

中图分类号：

TQ174 [陶瓷工业]; TB3 [工程材料学];

学科分类号：

0805 ; 080502 ;

摘要：

Observations are reported of the room-temperature propagation of a spalling failure mode of a thermal barrier coating (TBC) from its bond coat after oxidation, The coating is a Y2O3-stabilized ZrO2 coating formed by electron-beam deposition on a Ni-Co-Cr-Al-Y bond coat, The spall shape evolution and stress redistribution as the spall propagates are reported, The failure propagates primarily as an interface crack between the bond coat and the thermally grown aluminum oxide (TGO) formed on the underside of the TBC during oxidation, The observations are consistent with subcritical propagation of an interface crack between the TGO and bond coat assisted by the presence of moisture. An estimate of 9 J/m(2) is made of the fracture resistance in air of the interface.

引用

页码：3237 / 3242

页数：6

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