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Coatings 2019, 9(2), 101; https://doi.org/10.3390/coatings9020101

Modelling Thermal Conductivity of Porous Thermal Barrier Coatings

1
Department of Mechanical Engineering, University of Ottawa, Ottawa, ON K1N 6N5, Canada
2
Structures, Materials and Manufacturing Laboratory, Aerospace Portfolio, National Research Council Canada, Ottawa, ON K1N 6N5, Canada
*
Author to whom correspondence should be addressed.
Received: 5 September 2018 / Revised: 8 January 2019 / Accepted: 11 January 2019 / Published: 7 February 2019
(This article belongs to the Special Issue Thermal Barrier Coatings)
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Abstract

Thermal conductivity of porous thermal barrier coatings was evaluated using a newly developed five-phase model. It was demonstrated that porosities distributed in coating strongly affect thermal conductivity. The decisive reason for this change in thermal conductivity can be traced back to defect morphology and its orientation, depending on the coating deposition technique and process parameters used during deposition. In this paper, the Bruggeman’s two-phase model was used as a reference, and a five-phase model was developed to evaluate the thermal conductivity of porous coatings. This approach uses microstructural details of the shape, size, orientation and volumetric fraction of defects of coatings as input parameters. The proposed model can predict thermal conductivity values better than the previous two-phase model. View Full-Text
Keywords: thermal barrier coatings; thermal conductivity; YSZ; porosity thermal barrier coatings; thermal conductivity; YSZ; porosity
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Ghai, R.S.; Chen, K.; Baddour, N. Modelling Thermal Conductivity of Porous Thermal Barrier Coatings. Coatings 2019, 9, 101.

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