In this study, piston and valve surfaces of a Diesel engine to improve exhaust emis?sion performance values, NiCr with bond coat without Cr2O3, Al2O3+13%TiO2, Cr2O3+25%Al2O3 coatings were coated using plasma spray method. By examining the micro-structures coating materials, it was observed that good is formed. unlike other applications, two different proportions specific ceramic powders on comb...