1. thermal spraying

Thermal spraying is the use of some heat source to heat the coating material to molten or semi-molten state, and with the help of flame flow and high-speed gas atomization, and promote these atomized particles spray to the surface of the matrix, deposition into a coating with a certain function. Thermal spraying can provide wear resistance, corrosion resistance, high temperature resistant coating on the workpiece surface. There are usually three bonding modes between coating materials and substrate: mechanical bonding, physical bonding and metallurgical bonding. With the emergence of low-pressure plasma spraying, high-energy, high-speed plasma spraying and high-speed flame spraying, the performance of the coating has been further improved: the porosity can be reduced to 015% ~ 1%; The bonding strength between the coating and the substrate can reach 70 ~ 140MPa.

Studies have shown that Using supersonic flame spraying (HVOF) technology and plasma spraying (ASP) technology, respectively in 0 cr13ni5mo iron-based amorphous alloy was prepared on stainless steel substrates and iron-based amorphous nanocrystalline coating, coating is studied two kinds of coating on the friction and wear properties at room temperature, the results show that both kinds of preparation of iron base coating spraying process, has higher microhardness and more Small porosity, dense structure, typical layered structure, improve the wear resistance of the coating.