A sintering model for plasma-sprayed zirconia TBCs. Part I: Free-standing coatings
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.
- Published Version
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.
|Keywords:||Plasma-sprayed thermal barrier coatings; Modelling; Sintering; Diffusion; Variational principle|
|Divisions:||Faculty of Physical and Applied Science > Electronics and Computer Science > EEE
|Date Deposited:||09 Feb 2009 11:29|
|Last Modified:||02 Nov 2012 10:50|
|Contributors:||Cipitria, A. (Author)
Golosnoy, I.O. (Author)
Clyne, T.W. (Author)
|Further Information:||Google Scholar|
|ISI Citation Count:||25|
|RDF:||RDF+N-Triples, RDF+N3, RDF+XML, Browse.|
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