Mesoscopic nonlinear elastic modulus of thermal barrier coatings determined by cylindrical punch indentation

被引：18

作者：

Eldridge, JI ^{[1
]}

Zhu, DM ^{[1
]}

Miller, RA ^{[1
]}

机构：

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

来源：

JOURNAL OF THE AMERICAN CERAMIC SOCIETY | 2001年 / 84卷 / 11期

关键词：

D O I：

10.1111/j.1151-2916.2001.tb01087.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：

Cylindrical punch indentations are performed to determine the effective modulus of a plasma-sprayed ZrO2-8 wt% Y2O3 thermal barrier coating (TBC) as a function of coating depth. Cylindrical punch indentations offer significant advantages over pointed (Vickers, Berkovich, or Knoop) indentations for materials that do not exhibit linear elastic behavior. Cyclic loading with a cylindrical punch clearly shows the TBCs to exhibit nonlinear elastic behavior with significant hysteresis that is related to the compaction and internal sliding within the plasma-spray splat microstructure. Also, the effect of a high-heat-flux laser treatment is shown to produce a gradient both in the effective TBC modulus and degree of loading/unloading hysteresis with depth.

引用

页码：2737 / 2739

页数：3

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