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Synthesis and characterization of $Y_3Al_5O_{12}$ and $ZrO_2–Y_2O_3$ thermal barrier coatings by combustion spray pyrolysis

Saravanan, S and Srinivas, Hari G and Jayaram, V and Paulraj, M and Asokan, S (2008) Synthesis and characterization of $Y_3Al_5O_{12}$ and $ZrO_2–Y_2O_3$ thermal barrier coatings by combustion spray pyrolysis. In: Surface and Coatings Technology, 202 (19). pp. 4653-4659.

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Abstract

$Y_3Al_5O_{12}$ and $ZrO_2–Y_2O_3$ (8 mol% YSZ) coatings for potential application as thermal barrier coatings were prepared by combustion spray pyrolysis. Thermal cycling of as deposited coatings on stainless steel and FeCrAlY bond coat substrates was carried out at $1000^oC$ and $1200^oC$ to determine the thermal fatigue response. Structural and morphological studies on $Y_3Al_5O_{12}$ and 8 mol% YSZ coatings before and after thermal cycling have been carried out. It has been noted that the coatings on FeCrAlY substrates remain intact after 50 cycles between room temperature and $1200^oC$, whereas the coatings on stainless steel show some minor damage such as peeling off near the periphery after 50 cycles at $1000^oC$.Thermal diffusivity values of $Y_3Al_5O_{12}$ and 8 mol% YSZ films were measured by using photo thermal deflection spectroscopy and the values are lower than those of coatings produced by conventional techniques such as EBPVD and APS.

Item Type: Journal Article
Additional Information: Copyright of this article belongs to Elsevier.
Keywords: Combustion spray pyrolysis;Y3Al5O12 and ZrO2-Y2O3 coatings;Thermal cycling.
Department/Centre: Division of Physical & Mathematical Sciences > Instrumentation and Applied Physics (Formally ISU)
Division of Mechanical Sciences > Materials Engineering (formerly Metallurgy)
Date Deposited: 01 Aug 2008
Last Modified: 19 Sep 2010 04:48
URI: http://eprints.iisc.ernet.in/id/eprint/15334

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