In this study, engine parts of diesel engine’s combustion chamber surfaces insulated with different powder by plasma spraying that was examined microstructure analysis and impact on work performance after along study of the coating layer. Firstly, the piston and valve surfaces in the combustion chamber of the engine were coated via plasma spray method with 100 μm of NiCrAl as lining layer and the same parts were then coated with 400 μm of the mixture of 88% of ZrO2, 4% of MgO and 8% of Al2O3 without changing the compression ratio of the engine. Secondly, the thermal insulated engine was run with biofuel for long run at 1800 rpm engine speed in order to find out the effects of biofuel on engine parts and thermal insulated material. The study results determined that the combustion chamber of coatability by plasma spray method and it can increase durability of piston and valves. Furthermore, It was seen as not formed of discontinuous cracks and no pores in the coating layer the bonding and between the layers takes place in a good way, as a result of the macro structure and SEM (Scanning Electron Microscope) analysis.
Keyword: Plasma spray, Thermal barrier coatings, SEM, Biodiesel, Diesel Engine