The preparation and characterization of BaTiO_3 coatings sprayed by supersonic plasme spraying

BaTiO3 coating on 45 steel substrate were prepared by high velocity oxy-fuel and plasma spraying,the microstructure morphology and phase composition were analyzed by SEM,XRD and XPS,the microhardness and nanoindentation of the coating were analyzed as well.The results showed that the surface of the coating was black and smooth,characteristics of porosity was 0.8%;the coatings were of typical layer structure,BaTiO3 had mechanical bonding with the substrate,the average value was 42MPa;the nanoindentation equipment showed that test the coating surface hardness was 7.065GPa,elastic modulus was 103.77GPa,micro hardness reached 648.6HV0.1,therefore the coating showed the fine mechanical property;the result of the XRD inflection showed the main phase was BaTiO3,there were three main peaks(101),(111),(200).Through the high velocity oxy-fuel and plasma spraying,coating can obtain a good comprehensive performance.