期刊
ACTA MATERIALIA
卷 57, 期 4, 页码 993-1003出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.actamat.2008.10.058
关键词
Plasma-sprayed thermal barrier coatings; Modelling; Diffusion; Constrained sintering; Variational principle
资金
- EPSRC
- Sulzer Metco (US) Inc.
- Engineering and Physical Sciences Research Council [GR/R95364/01] Funding Source: researchfish
The sintering model described in Part I. which relates to free-standing plasma-sprayed thermal barrier coatings. is extended here to the case of a coating attached to a rigid substrate. Through-thickness shrinkage measurements have been carried out for coatings attached to zirconia substrates, and these experimental data are compared with model predictions. The model is then used to explore the influence of the substrate material (zirconia vs. a nickel superalloy), and of the in-plane coating stiffness. Both differential thermal expansion stresses and tensile stresses arising from the constraint imposed on in-plane shrinkage can be relaxed via two diffusional mechanisms: Coble creep and microcrack opening. This relaxation allows progression towards densification. although the process is somewhat inhibited, compared with the case of a free-standing coating. Comparison of the stored elastic strain energy with the critical strain energy release rate for interfacial cracking allows estimates to be made of whether debonding is energetically favoured.(1) (C) 2008 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.
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