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Modelling of gas permeation through ceramic coatings produced by thermal spraying

Modelling of gas permeation through ceramic coatings produced by thermal spraying
Modelling of gas permeation through ceramic coatings produced by thermal spraying
An analytical model has been developed for simulation of gas permeation through thermal spray coatings, and for prediction of the permeability. The model is based on a geometrical representation of the coating microstructure. This involves thin splats, with limited inter-splat bridging, and microcracks within the splats. Important variables include the thickness (smallest dimension) of the inter-splat pores and intra-splat microcracks. Uniform values of these parameters are used in the model. Predicted permeabilities are compared with experimental data obtained using plasma-sprayed zirconia coatings, both in the as-sprayed state and after heat treatments sufficient to generate significant microstructural changes via sintering effects. In general, good agreement is obtained and it is concluded that the model constitutes a useful tool for exploration of gas permeation characteristics in coatings or layers produced by thermal spraying
Gas permeability, Analytical modelling, Plasma spray coatings, Porous material
1359-6454
874-883
Golosnoy, I.O.
40603f91-7488-49ea-830f-24dd930573d1
Paul, S.
83953eee-4704-4a37-a39a-3f885b22af28
Clyne, T.W.
00678bf7-17de-46e8-9b35-bf1ca73bce9b
Golosnoy, I.O.
40603f91-7488-49ea-830f-24dd930573d1
Paul, S.
83953eee-4704-4a37-a39a-3f885b22af28
Clyne, T.W.
00678bf7-17de-46e8-9b35-bf1ca73bce9b

Golosnoy, I.O., Paul, S. and Clyne, T.W. (2008) Modelling of gas permeation through ceramic coatings produced by thermal spraying. Acta Materialia, 56 (4), 874-883. (doi:10.1016/j.actamat.2007.09.045).

Record type: Article

Abstract

An analytical model has been developed for simulation of gas permeation through thermal spray coatings, and for prediction of the permeability. The model is based on a geometrical representation of the coating microstructure. This involves thin splats, with limited inter-splat bridging, and microcracks within the splats. Important variables include the thickness (smallest dimension) of the inter-splat pores and intra-splat microcracks. Uniform values of these parameters are used in the model. Predicted permeabilities are compared with experimental data obtained using plasma-sprayed zirconia coatings, both in the as-sprayed state and after heat treatments sufficient to generate significant microstructural changes via sintering effects. In general, good agreement is obtained and it is concluded that the model constitutes a useful tool for exploration of gas permeation characteristics in coatings or layers produced by thermal spraying

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Published date: February 2008
Keywords: Gas permeability, Analytical modelling, Plasma spray coatings, Porous material
Organisations: EEE

Identifiers

Local EPrints ID: 265163
URI: http://eprints.soton.ac.uk/id/eprint/265163
ISSN: 1359-6454
PURE UUID: 9108fdf6-0a62-4a5c-b502-96b9da2e42d1

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Date deposited: 07 Feb 2008 12:05
Last modified: 14 Mar 2024 08:03

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Contributors

Author: I.O. Golosnoy
Author: S. Paul
Author: T.W. Clyne

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