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A sintering model for plasma-sprayed zirconia TBCs. Part I: Free-standing coatings

A sintering model for plasma-sprayed zirconia TBCs. Part I: Free-standing coatings
A sintering model for plasma-sprayed zirconia TBCs. Part I: Free-standing coatings
A sintering model is presented for prediction of changes in the microstructure and dimensions of free-standing, plasma-sprayed (PS) thermal barrier coatings (TBCs). It is based on the variational principle. It incorporates the main microstructural features of PS TBCs and simulates the effects of surface diffusion, grain boundary diffusion and grain growth. The model is validated by comparison with experimental data for shrinkage, surface area reduction and porosity reduction. Predicted microstructural changes are also used as input data for a previously developed thermal conductivity model. Good agreement is observed between prediction and measurement for all these characteristics. The model allows separation of the effects of coating microstructure and material properties, and captures the coupling between densifying and non-densifying mechanisms. A sensitivity analysis is presented, which highlights the importance of the initial pore architecture. Predictions indicate that the microstructural changes which give rise to (undesirable) increases in thermal conductivity and stiffness are very sensitive to surface diffusion.
Plasma-sprayed thermal barrier coatings, Modelling, Sintering, Diffusion, Variational principle
1359-6454
980-992
Cipitria, A.
53f2ee50-b925-41f3-a195-ecb46fce2c01
Golosnoy, I.O.
40603f91-7488-49ea-830f-24dd930573d1
Clyne, T.W.
00678bf7-17de-46e8-9b35-bf1ca73bce9b
Cipitria, A.
53f2ee50-b925-41f3-a195-ecb46fce2c01
Golosnoy, I.O.
40603f91-7488-49ea-830f-24dd930573d1
Clyne, T.W.
00678bf7-17de-46e8-9b35-bf1ca73bce9b

Cipitria, A., Golosnoy, I.O. and Clyne, T.W. (2009) A sintering model for plasma-sprayed zirconia TBCs. Part I: Free-standing coatings. Acta Materialia, 57 (4), 980-992. (doi:10.1016/j.actamat.2008.10.024).

Record type: Article

Abstract

A sintering model is presented for prediction of changes in the microstructure and dimensions of free-standing, plasma-sprayed (PS) thermal barrier coatings (TBCs). It is based on the variational principle. It incorporates the main microstructural features of PS TBCs and simulates the effects of surface diffusion, grain boundary diffusion and grain growth. The model is validated by comparison with experimental data for shrinkage, surface area reduction and porosity reduction. Predicted microstructural changes are also used as input data for a previously developed thermal conductivity model. Good agreement is observed between prediction and measurement for all these characteristics. The model allows separation of the effects of coating microstructure and material properties, and captures the coupling between densifying and non-densifying mechanisms. A sensitivity analysis is presented, which highlights the importance of the initial pore architecture. Predictions indicate that the microstructural changes which give rise to (undesirable) increases in thermal conductivity and stiffness are very sensitive to surface diffusion.

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Published date: April 2009
Keywords: Plasma-sprayed thermal barrier coatings, Modelling, Sintering, Diffusion, Variational principle
Organisations: EEE

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Local EPrints ID: 267087
URI: http://eprints.soton.ac.uk/id/eprint/267087
ISSN: 1359-6454
PURE UUID: 63856d40-ffc0-45fa-b10f-2e3135df349c

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Date deposited: 09 Feb 2009 11:29
Last modified: 16 Dec 2019 20:41

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Contributors

Author: A. Cipitria
Author: I.O. Golosnoy
Author: T.W. Clyne

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