Thermal conductivity of zirconia coatings with zig-zag pore microstructures


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), 2539-2547. (doi:10.1016/S1359-6454(01)00141-0).

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Description/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%.

Item Type: Article
ISSNs: 1359-6454 (print)
Related URLs:
Keywords: physical vapour deposition (pvd), thermal barrier coating, thermal conductivity, microstructure, computer simulation
Subjects: T Technology > TJ Mechanical engineering and machinery
T Technology > TN Mining engineering. Metallurgy
Q Science > QA Mathematics
Divisions: University Structure - Pre August 2011 > School of Engineering Sciences > Thermofluids and Superconductivity
University Structure - Pre August 2011 > School of Engineering Sciences > Engineering Materials & Surface Engineering
ePrint ID: 47912
Date Deposited: 10 Aug 2007
Last Modified: 27 Mar 2014 18:31
URI: http://eprints.soton.ac.uk/id/eprint/47912

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