The influence of bondcoat and topcoat mechanical properties on stress development in thermal barrier coating systems

被引：143

作者：

Busso, E. P. ^{[1
]}

Qian, Z. Q. ^{[2
]}

Taylor, M. P. ^{[3
]}

Evans, H. E. ^{[3
]}

机构：

[1] Mines ParisTech, UMR 7633, Ctr Mat, CNRS, F-91003 Evry, France

[2] Univ London Imperial Coll Sci Technol & Med, Dept Mech Engn, London, England

[3] Univ Birmingham, Dept Met & Mat, Birmingham B15 2TT, W Midlands, England

来源：

ACTA MATERIALIA | 2009年 / 57卷 / 08期

关键词：

Finite element analysis; Thermal barrier coating system; TBC; Stress analysis; Sintering; DISPLACEMENT INSTABILITY; OXIDATION;

D O I：

10.1016/j.actamat.2009.01.017

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

A finite-element study has been undertaken to investigate the stress development within a TBC system consisting of an EB-PVD YSZ topcoat and a Pt-aluminized diffusion bondcoat. Particular attention has been paid to the role of variables such as the clastic anisotropy within the topcoat, interface roughness, variation in creep strength of the bondcoat and the volumetric strains associated with the formation of the thermally grown oxide (TGO). Bond coat oxidation and thermal loading during cooling give rise to significant tensile stresses within the topcoat and tensile tractions at the TGO interfaces. Bondcoat creep, as distinct from yield and plastic behaviour, was the dominant stress relaxation process, and strong bondcoats (in creep) tended to show higher tensile stress levels. Another important factor determining gave rise to considerably higher stress than a transversely isotropic topeoat. (C) 2009 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.

引用

页码：2349 / 2361

页数：13

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