A parametric study of the stress state of thermal barrier coatings -: Part I:: creep relaxation

被引：175

作者：

Rösler, J ^{[1
]}

Bäker, M ^{[1
]}

Aufzug, K ^{[1
]}

机构：

[1] Tech Univ Braunschweig, D-38106 Braunschweig, Germany

来源：

ACTA MATERIALIA | 2004年 / 52卷 / 16期

关键词：

plasma spraying; thin films; creep; finite element analysis; thermal barrier coating;

D O I：

10.1016/S1359-6454(04)00387-8

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

The mechanical loading of the thermal barrier coating (TBC)/thermally grown oxide (TGO)/bond coat interface region is calculated for a TBC coated superalloy specimen using a finite element model. The stress state depends crucially on the ratio of the loading rate caused by growth and swelling of the oxide layer and the unloading rate by creep relaxation. By performing parametric studies with large variations of the creep strengths of the TGO and the TBC, it is shown that a single parameter, which can be motivated by a simple model, can be used to estimate the resulting stresses in the high-temperature steady state. The influence of a change in geometry is also studied. The crucial parameter here is the aspect ratio of the (sinusoidal) interface, i.e., the ratio of the wavelength and the amplitude. (C) 2004 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.

引用

页码：4809 / 4817

页数：9

共 16 条

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