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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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%.
|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
|Date Deposited:||10 Aug 2007|
|Last Modified:||01 Jun 2011 02:30|
|Contact Email Address:||TJL21@eng.cam.ac.uk|
|RDF:||RDF+N-Triples, RDF+N3, RDF+XML, Browse.|
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