Study Of Microstructure And Phase Of Plasma Sprayed High Molybdenum Composite Coating

Automotive sectors now days are focused on improving the engine efficiency. To enhance the tribological properties of the engine, the thermal spray technique was used for depositing the coating on the cast iron substrate. To provide a reliable basis for the practical application in automotive industry, composite powder containing 60% high carbon molybdenum, 20% pure molybdenum, 10% CrC and 10% NiCr deposited on the cast iron substrate by atmospheric plasma spray method. In this paper, to investigate the microstructure and phases analysis of the deposited coating, scanning electron microscope and X-ray diffraction was performed. The results show that the obtained composite coating has a uniform, laminar and dense microstructure with good coating adhesion with the substrate. The thickness of the composite coating on the substrate is about 371µm.