In the process of thermal spraying, the coating is a discontinuous structure formed by the molten state of thermal spraying powder particles sprayed to the substrate through high-pressure air at high speed, layer by layer very regularly superimposed, and the workpiece substrate undergoes processes such as bumping, deformation and solidification. Afterwards, a thermal spray processing coating is formed. The coating has a typical layered structure, and there are vacancies to varying degrees inside, which affects the bonding strength with the metal substrate and the density of the surface layer, so it is difficult to adapt to the harsh environment. This limits its application scale and service life.https://tsmachining.com/
In thermal spray processing, remelting technology is to use a heat source to melt the most easily meltable particle components in the alloy. The liquid phase produced helps to strengthen the dispersion process and penetrate the components. The result of the melting makes the thermal spray process coating and substrate The bonding area is changed from the original stacked layered arrangement to a dense and more uniform arrangement, and the pores are reduced or even disappeared. Therefore, the appropriate remelting treatment can improve the bonding strength between the coating and the substrate and the internal quality of the coating, thereby improving the wear and corrosion resistance of the coating. Now, remelting processing skills mainly include laser cutting, electron beam, TIG remelting, flame remelting, total heating and induction remelting, etc.
