As one of the surface modification technologies that improve performance without damage or deformation of the base material, it is changed into a molten or semi-melted state by injecting powder or wire-type thermal spraying material into a thermal spraying device that generates a high-temperature heat source such as flame or plasma, and then changing it to a high-speed It is a technology to form a film layer by colliding and stacking on the surface of the base material.
There are HVOF, Plasma, Flame, Arc spray, etc.