The University of Southampton
University of Southampton Institutional Repository

An Analytical Model for Simulation of Heat Flow in Plasma-Sprayed Thermal Barrier Coatings

Record type: Article

Numerical (finite difference) and analytical models have been developed for the simulation of heat flow through plasma-sprayed coatings, allowing the effective thermal conductivity to be predicted as a function of microstructural parameters. The structure is assumed to be composed of lamellar material (splats), separated by (thin) pores, within which there are areas of contact (bridges). The analytical model is based on dividing the material into two regimes, within which the heat flow occurs either by unidirectional serial flow through lamellae and pores or by being funneled through the regions of the lamellae above and below the bridges. The validity of this model is demonstrated by a comparison of the predictions obtained from it and those obtained from the numerical model. The effects of pore geometry on conductive and radiative heat transfer within the coating have been investigated over a range of temperatures and gas pressures. It is shown that the main factor controlling the conductivity is the intersplat bridge area. Comparisons are also presented with experimental conductivity data, for cases in which some attempt has been made to characterize the key microstructural features. The study is oriented toward thermal barrier coatings, based on zirconiayttria top coats. It is noted that the effect of microstructural sintering, which tends to occur in these coatings under service conditions, can be predicted using this model.

PDF jtst_14(2005)_205.pdf - Other
Download (319kB)

Citation

Golosnoy, I.O., Tsipas, S.A. and Clyne, T.W. (2005) An Analytical Model for Simulation of Heat Flow in Plasma-Sprayed Thermal Barrier Coatings Journal of Thermal Spray Technology, 14, (2), pp. 205-214. (doi:10.1361/10599630523764).

More information

Published date: June 2005
Keywords: heat transfer, modeling, plasma spaying, thermal barrier coatings, thermal conductivity
Organisations: EEE

Identifiers

Local EPrints ID: 264625
URI: http://eprints.soton.ac.uk/id/eprint/264625
ISSN: 1059-9630
PURE UUID: 8934cdc4-479c-4176-9825-895786bbcc28

Catalogue record

Date deposited: 03 Oct 2007
Last modified: 18 Jul 2017 07:33

Export record

Altmetrics

Contributors

Author: I.O. Golosnoy
Author: S.A. Tsipas
Author: T.W. Clyne

University divisions


Download statistics

Downloads from ePrints over the past year. Other digital versions may also be available to download e.g. from the publisher's website.

View more statistics

Atom RSS 1.0 RSS 2.0

Contact ePrints Soton: eprints@soton.ac.uk

ePrints Soton supports OAI 2.0 with a base URL of http://eprints.soton.ac.uk/cgi/oai2

This repository has been built using EPrints software, developed at the University of Southampton, but available to everyone to use.

We use cookies to ensure that we give you the best experience on our website. If you continue without changing your settings, we will assume that you are happy to receive cookies on the University of Southampton website.

×