Thermal conductivity of zirconia coatings with zig-zag pore microstructures

Citation
S. Gu et al., Thermal conductivity of zirconia coatings with zig-zag pore microstructures, ACT MATER, 49(13), 2001, pp. 2539-2547
Citations number
9
Categorie Soggetti
Apllied Physucs/Condensed Matter/Materiales Science","Material Science & Engineering
Journal title
ACTA MATERIALIA
ISSN journal
13596454 → ACNP
Volume
49
Issue
13
Year of publication
2001
Pages
2539 - 2547
Database
ISI
SICI code
1359-6454(20010801)49:13<2539:TCOZCW>2.0.ZU;2-U
Abstract
Highly porous zirconia based thermal barrier coatings have recently been sy nthesised with zigzag morphology pores which appear to impede heat flow thr ough the thickness of the coating. A combined analytical/numerical study of heat conduction across these microstructures is presented and compared wit h thermal conductivity measurements. The effects of pore volume fraction, p ore type, pore orientation and pore spacing, to-ether with the wave length and the amplitude of zig-zag pore microstructures on overall thermal perfor mance are quantified. The results indicate that even a few volume percent o f zig-zag inter-column pores oriented normal to the substrate surface reduc e the overall thermal conductivity of the coatings by more than 50%. (C) 20 01 Acta Materialia Inc. Published by Elsevier Science Ltd. All rights reser ved.