Thermal spray technology is a surface engineering technology that involves depositing tiny and dispersed metal or non-metallic coating materials in a molten or semi-molten state onto a prepared substrate surface to form a surface coating with various functions. This technology uses heat sources such as arcs, plasma sprays or combustion flames to heat powdered or filamentary materials to a molten or semi-molten state, and then sprays them onto the pretreated substrate surface at a certain speed through a flame stream or compressed air, thereby forming coating. Thermal spray technology has significant advantages in improving the wear resistance, corrosion resistance, and heat resistance of materials. It can also repair and strengthen the surface of parts. It can not only be used in the manufacture of new products as a preventive measure, but can also be used in the repair of old parts as a means of repair. Thermal spray technology has been widely used in aviation, aerospace, machinery, electronics, iron and steel metallurgy, energy, transportation, petroleum, chemical industry, food, textiles, weapons and other national economic sectors, and has played an important role in high-tech fields.