Rotary seal valve hardening technology: laser cladding technology and supersonic flame spraying
Laser cladding technology
Laser cladding is used to melt the coating materials and the substrate surface at the same time by laser irradiation and solidify quickly to form a surface coating that combines with the matrix metallurgy. It can improve the wear resistance, corrosion resistance, heat resistance, oxidation resistance and electrical properties of the base surface remarkably. Compared with the surfacing, spraying, electroplating and gas phase deposition, laser cladding has the characteristics of small dilution, compact structure, good combination of coating and matrix, suitable for multi coating material, large change of size and content. Because of the small loss of the coating material, the special process of laser cladding can save a large amount of material. Although the performance of the valve seal surface with laser cladding hardening is superior to the plasma surface and manual arc surface, the high price of the laser cladding equipment restricts its application on the hardening of the valve.