Study On The Arc Spraying Process And Performance Of Iron Aluminide Intermetallic Coatings

In this paper, inverter power source is applied to the arc spraying process based on the current state and development of arc spraying technology at home and aboard. Further theoretical analysis is conducted on the principle of arc spraying process optimized by orthogonal experimental design. Combination mechanism and hot-wearability mechanism of coatings prepared by arc spraying process are studied, which provides the theoretical basis for the extensive application of the process optimized and coatings with hot wearability.The qualitative analysis in terms of the effect of gas flow field on the coatings is obtained through the discussion in theory about the force of high-velocity gas flow on the droplets in the arc spraying process. Square wave inverter power source is proposed in arc spraying process through analyzing the heat stability of arc. It is also proved to be the ideal power source for arc spraying process according to the experimental analysis of the dynamic behavior in arc.Optimum process parameters optimized by orthogonal experimental design are acquired following the principle of arc spraying process. It is concluded that the coating performance depends most on the current through the qualitative analysis of the effect of process parameters on the coating performance.The microstructure of iron aluminide coatings is investigated by transmission electron microscope(TEM), scanning electron microscope(SEM), X-ray analysis(XRD) and energy dispersive spectrometer(EDS). The formation mechanism of iron aluminide intermetallic composite discussed and abrasion mechanism of composite coatings studied under specific temperature in this paper provide the theoretical basis for the application and production of iron aluminide intermetallic coatings.