Effect of Al2O3/PSZ and Al2O3/YSZ ceramic coating in CI engine fueled with ternary blends of castor seed oil and jatropha oil biodiesel dosed with diesel

In this research work, alumina (Al2O3) with Partially Stabilized Zirconia (PSZ) and Yttria Stabilized Zirconia (YSZ) were coated on the engine piston and intake and exhaust valves using the atmospheric plasma spray technique as a thermal barrier coating (TBC) over NiCrAl bond coat. The aim of this work is to experimentally investigate the thermal cycling behavior and performance and emission analysis of the coated engine fuelled with ternary blends produced from castor and jatropha seed oils dosed with diesel. Three ternary blends were prepared in various proportions of B20, B40 and B50 and tested in coated and uncoated engines. The experimental findings revealed that Al2O3/YSZ based TBC has good thermal cycling behavior and the formation of thermally generated oxide (TGO) was primarily responsible for the spallation of the coating. The ternary blends showed higher brake thermal efficiency (BTE) and lower specific fuel consumption (SFC) when operated in the TBC engine. At B20 operating conditions maximum improvement of 2.98% and 3.43% BTE is recorded using Al2O3/PSZ and Al2O3/YSZ coated engine compared to conventional engine operated with neat diesel. In emissions, compared to conventional diesel engines, both TBC coated engines produced less HC and CO with increased NOx levels.