Thermophysical Properties of Air Plasma Sprayed Zirconia Coating Deposited by Reconstituted Nanosize Particles

doi:10.3724/SP.J.1077.2010.00695

Journal of Inorganic Materials ›› 2010, Vol. 25 ›› Issue (7): 695-699.DOI: 10.3724/SP.J.1077.2010.00695

• Research Paper • Previous Articles Next Articles

Thermophysical Properties of Air Plasma Sprayed Zirconia Coating Deposited by Reconstituted Nanosize Particles

LIANG Bo^1,2, CAI An², CHEN Huang³, DING Chuan-Xian²

(1. State Key Laboratory of Metastable Materials Science and Technology, Yanshan University, Qinhuangdao 066004, China; 2. Shanghai Institute of Ceramics, Chinese Academy of Sciences, Shanghai 200050, China; 3.Interface Engineering Laboratory, Department of Materials Engineering, Sun Moon University, ChungNam 336708, South Korea)

Received:2009-09-24 Revised:2009-12-01 Published:2010-07-20 Online:2010-06-10
Supported by:
Chine-France PRA dans ledomaine des mat é riaux 2002 under grant PRA MX02-03 (C.Coddet & C.Ding)

Abstract

Abstract:

ZrO₂-3mol% Y₂O₃coating was deposited by air plasma spraying using reconstituted nanosize particles. The microstructure was examined by SEM and TEM. The thermal conductivity was calculated based on the specific heat and thermal diffusivity detected by DSC and laser flash method. The results show that the thermal barrier zirconia coating with thermal conductivity ranging from 0.63-0.80 W/(m·K) is obtained. This can be attributed to the homogeneous distribution of micro-size pores and amounts of micro-cracks with average length of about 10 μm, to which heat flow is nearly perpendicular. The phase transition of t to m can result in the change of thermophysical properties. The grain growth and the decrease of porosity lead to increase of thermal conductiviy of as-sprayed coating.

Key words: nanosize particle, air plasma spraying, zirconia coating, thermophysical properties

CLC Number:

TQ174

LIANG Bo, CAI An, CHEN Huang, DING Chuan-Xian. Thermophysical Properties of Air Plasma Sprayed Zirconia Coating Deposited by Reconstituted Nanosize Particles[J]. Journal of Inorganic Materials, 2010, 25(7): 695-699.

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Thermophysical Properties of Air Plasma Sprayed Zirconia Coating Deposited by Reconstituted Nanosize Particles

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