THERMAL SCIENCE

International Scientific Journal

EXPERIMENTAL INVESTIGATION OF THERMAL BARRIER (8YSZ-TIO2-AL2O3) COATED PISTON USED IN DIRECT INJECTION COMPRESSION IGNITION ENGINE

ABSTRACT
Thermal barrier coatings are becoming increasingly important in providing protection from high temperature degradation for heat engine components and allow further increase in engine temperatures for higher efficiency. The main objective of this research work is to experimentally investigate the air plasma sprayed yttria stabilized zirconia with addition of titanium oxide and aluminum oxide thermal barrier coating on Al-13% Si piston material. The mechanical properties of the coated and uncoated samples were comparatively analyzed. The test revealed that hardness values of coated samples are ten times higher than the hardness values of uncoated samples. The microstructure and surface morphology of the coating were evaluated by scanning electron microscopy. The delamination behaviour of thermal barrier coating was evaluated by thermal cycle test. Finally, the performance test of the coated and uncoated engine was evaluated with the same engine operating conditions. The brake thermal efficiency is increased by 5.99%. The brake specific fuel consumption was decreased by 0.06 kg/kWh, in TBC engine with 8YSZ + Al2O3 + TiO2. The CO and HC was greatly decreased in thermal barrier coating engine. There was the greater reduction of NOx is observed due to coating because of nitrogen has absorbed by zirconia.
KEYWORDS
PAPER SUBMITTED: 2016-02-20
PAPER REVISED: 2016-04-05
PAPER ACCEPTED: 2016-05-05
PUBLISHED ONLINE: 2016-11-13
DOI REFERENCE: https://doi.org/10.2298/TSCI16S4189M
CITATION EXPORT: view in browser or download as text file
THERMAL SCIENCE YEAR 2016, VOLUME 20, ISSUE Supplement 4, PAGES [S1189 - S1196]
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© 2018 Society of Thermal Engineers of Serbia. Published by the Vinča Institute of Nuclear Sciences, 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