Thermal conductivity of zirconia coatings with zig-zag pore microstructures
Thermal conductivity of zirconia coatings with zig-zag pore microstructures
Highly porous zirconia based thermal barrier coatings have recently been synthesised with zig-zag morphology pores which appear to impede heat flow through the thickness of the coating. A combined analytical/numerical study of heat conduction across these microstructures is presented and compared with thermal conductivity measurements. The effects of pore volume fraction, pore type, pore orientation and pore spacing, together with the wave length and the amplitude of zig-zag pore microstructures on overall thermal performance are quantified. The results indicate that even a few volume percent of zig-zag inter-column pores oriented normal to the substrate surface reduce the overall thermal conductivity of the coatings by more than 50%.
physical vapour deposition (pvd), thermal barrier coating, thermal conductivity, microstructure, computer simulation
2539-2547
Gu, S.
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Lu, T.J.
5a4bb9e5-aa83-40aa-a79e-91a1d3cd22f9
Hass, D.D.
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Wadley, H.N.G.
80c038ca-fc21-47cc-87f7-7a14bd41b662
1 August 2001
Gu, S.
a6f7af91-4731-46fe-ac4d-3081890ab704
Lu, T.J.
5a4bb9e5-aa83-40aa-a79e-91a1d3cd22f9
Hass, D.D.
b4b347f3-7a35-47c0-861f-5fb223b1a9e9
Wadley, H.N.G.
80c038ca-fc21-47cc-87f7-7a14bd41b662
Gu, S., Lu, T.J., Hass, D.D. and Wadley, H.N.G.
(2001)
Thermal conductivity of zirconia coatings with zig-zag pore microstructures.
Acta Materialia, 49 (13), .
(doi:10.1016/S1359-6454(01)00141-0).
Abstract
Highly porous zirconia based thermal barrier coatings have recently been synthesised with zig-zag morphology pores which appear to impede heat flow through the thickness of the coating. A combined analytical/numerical study of heat conduction across these microstructures is presented and compared with thermal conductivity measurements. The effects of pore volume fraction, pore type, pore orientation and pore spacing, together with the wave length and the amplitude of zig-zag pore microstructures on overall thermal performance are quantified. The results indicate that even a few volume percent of zig-zag inter-column pores oriented normal to the substrate surface reduce the overall thermal conductivity of the coatings by more than 50%.
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Published date: 1 August 2001
Keywords:
physical vapour deposition (pvd), thermal barrier coating, thermal conductivity, microstructure, computer simulation
Organisations:
Engineering Mats & Surface Engineerg Gp
Identifiers
Local EPrints ID: 47912
URI: http://eprints.soton.ac.uk/id/eprint/47912
ISSN: 1359-6454
PURE UUID: cfd62178-06f1-4134-831d-51463285bc47
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Date deposited: 10 Aug 2007
Last modified: 15 Mar 2024 09:40
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Contributors
Author:
S. Gu
Author:
T.J. Lu
Author:
D.D. Hass
Author:
H.N.G. Wadley
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