Thermal barrier coating application of zircon sand

Ramaswamy, P and Seetharamu, S and Varma, KBR and Rao, KJ (1999) Thermal barrier coating application of zircon sand. In: Journal of Thermal Spray Technology, 8 (3). 447-453 .

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Abstract

Naturally occurring zircon sand was plasma spray coated on steel substrates previously coated with NiCrAlY bond coat. The coatings were characterized for their microstructure, chemical composition, thermal shock resistance, and the nature of structural phases present, The as-sprayed coatings consisted of t-ZrO2 (major phase), m-ZrO2, ZrSiO4 (minor phases), and amorphous SiO2. These coatings, when annealed at 1200 degrees C/1.44 x 10(4) s yielded a ZrSiO4 phase as a result of the reaction between ZrO2 and SiO2, Dramatic changes occurred in the characteristics of the coatings when a mixture of zircon sand and Y2O3 was plasma spray coated and annealed at 1400 degrees C/1.44 x 10(4) s, The t-ZrO2 phase was completely stabilized, and these coatings were found to have considerable potential for thermal barrier applications.

Item Type:	Journal Article
Publication:	Journal of Thermal Spray Technology
Publisher:	ASM International
Additional Information:	Copyright of this article belongs to ASM International.
Keywords:	plasma spray;stabilized ZrO2;thermal barrier coating; thermal shock resistance;zircon sand
Department/Centre:	Division of Chemical Sciences > Materials Research Centre
Date Deposited:	04 Aug 2011 06:20
Last Modified:	04 Aug 2011 06:20
URI:	http://eprints.iisc.ac.in/id/eprint/38865

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