THERMAL SCIENCE

International Scientific Journal

THERMAL BARRIER COATING USING YTTRIA STABILIZED ZIRCONIA BY PLASMA SPRAY TECHNIQUE

ABSTRACT
This paper deals with the tribological behavior of thermal barrier coating in engine liner and it also deals with the quality of thermally treated coating. Multi-layer structure formed from top coat and bond coat which was deposited on the same type of steel substrates, in which heat treatments may improve the mechanical properties of materials both substrate and coating and enhance their hard-ness for many cases of ceramics through recrystallization of microstructures. In addition, heat treatments will introduce residual stresses by different thermal contractions and lattice misfits because of microstructural changes that could lead to either premature failure or stress relaxation by new crack formations. Tribological wear properties of differently treated thermal barrier coating was examined to see the net effect of heat treatment on mechanical properties by tribometer with pin on disc mode. Indentation test at surface and cross-section of coatings are examined. The SEM and optical microscope examine several crack propagations. Energy-dispersive X-ray spectroscopyhelps to characterize thermal barrier coating. After thermally treating the sample, an examination of thermal barrier coating the oxide content was increased, sample became convex due to residual compressive stress, roughness reduces, adhesion between topcoat, and bond coat get reduced eventually. In addition to that, the surface gets cracks due to the reduction in hardness from 330 HV to 212 HV.
KEYWORDS
PAPER SUBMITTED: 2020-10-27
PAPER REVISED: 2021-01-02
PAPER ACCEPTED: 2021-02-04
PUBLISHED ONLINE: 2021-05-08
DOI REFERENCE: https://doi.org/10.2298/TSCI201027156V
CITATION EXPORT: view in browser or download as text file
THERMAL SCIENCE YEAR 2022, VOLUME 26, ISSUE Issue 2, PAGES [871 - 882]
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© 2024 Society of Thermal Engineers of Serbia. Published by the Vinča Institute of Nuclear Sciences, National Institute of the Republic of Serbia, Belgrade, Serbia. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution-NonCommercial-NoDerivs 4.0 International licence