Application of thermal spraying in Product Remanufacturing

       Tungsten carbide spraying is mainly used in ceramic coatings, and currently provides comprehensive protection solutions integrating protective coatings, personalized protection scheme design, and engineering technical services for electric power, steel, cement and other companies. Now the remanufacturing industry has been listed as a national development strategic emerging industry. Thermal spraying technology has a wide range of spraying materials, unlimited substrate shape and size, easy control of coating thickness, simple process operation, low cost and high efficiency, and can give special parts to the surface Performance and other characteristics are the key technical means to realize the surface size recovery and performance improvement of damaged parts. It has been successfully used in the remanufacturing of equipment parts in the defense industry, printing, aerospace, petrochemical, mining machinery, electric power and other fields. Including various shafts, pump valves, sealing rings, sputtering targets, corrugated rollers, various valves, rollers, fan impellers, drawing tower wheels and other high wear-resistant products and components and components such as wear resistance, high temperature resistance, Thermal spraying of various coatings such as corrosion, conductivity and insulation.

Remanufacturing of plasma spray technology.

  Plasma spraying technology began in the late 1950s. It is a process that uses plasma arc to heat and accelerate sprayed materials to form a coating. It is the process with the highest heat source temperature and the most concentrated energy in thermal spraying technology. It has a flame flow With the characteristics of high temperature and fast jet velocity, theoretically all materials with physical melting points can be sprayed.

a. For the remanufacturing of thin-walled parts for heavy-duty tracked vehicles

  In the 1970s and 1980s, Xu Binshi led the research team members to apply ordinary plasma spraying technology to repair the thin-walled parts of heavy-duty tracked vehicles for the first time in China. Nickel-clad aluminum was selected as the spraying base material, and the surface material was mainly iron-based and nickel-based alloys. Mainly, focusing on repairing and strengthening the mating surface of the inner circular sealing ring in the compression wheel disc and the inner circular self-pressing oil baffle of the recirculating oil baffle cover. Academician Xu Binshi put forward the concept of "enhanced repair" at that time, that is, scrap parts are treated by plasma spraying, which not only restores the size, but also extends the service life. This technical idea laid the technical foundation for the reform of the maintenance system of heavy-duty tracked vehicles.

b. Remanufacturing of engine piston skirts for heavy-duty vehicles

  The piston skirt is an important part of the piston assembly. It mainly plays a role of guiding and transferring heat, and bears the lateral thrust from the crank connecting rod mechanism. During the use of aluminum alloy pistons, due to the abnormal movement of the piston and the cylinder liner, the piston skirt is scratched and worn, which affects the life of the cylinder liner. Aiming at the working conditions and wear patterns of the piston, and taking into account the matrix material, Wang Haijun et al. repaired and strengthened the piston skirt by using supersonic plasma spraying AlSi+Ni/Al composite coating.