Thermal spraying technology refers to the application of a certain heat source, such as electric arc or plasma arc, to heat powdered metal and non-metallic coatings to a molten or semi-melted state, and then use the power of the flame itself or an external high-speed airflow to atomize and use A certain speed radiates to the surface of the pre-treated substrate.
It is a technology that separates from the substrate to form a surface masking coating with various functions. During the spraying process, the molten particles hit the outer surface of the substrate and then spread into flakes, and then cool and solidify immediately. Subsequent particles hit the previously formed flakes from time to time and accumulate to form a coating.
Thermal spraying technology can be divided into different heat sources: atmospheric plasma spraying, supersonic plasma spraying, arc spraying, high velocity arc spraying, flame spraying, supersonic flame spraying, explosive spraying, cold spraying, etc. The general process of thermal spraying includes three basic processes, namely, appearance pretreatment, spraying and post-coating treatment.
Thermal spraying technology has the comprehensive advantages of low coating preparation cost, high efficiency, simple and sensitive process, and many coating functions that can be prepared, including wear resistance, corrosion resistance, high temperature resistance, oxidation resistance, heat insulation, conductivity, insulation, and reduction. Motors, smoothing, anti-radiation, etc., have been important applications in aviation, power generation, automobiles and metallurgy, and have increasingly attracted the attention and attention of the industry.
