Plasma sprayed ceramic coating on moving ring

       The moving ring is the main part of the mechanical seal, and its performance is directly related to the sealing effect. Whether the sealing end face maintains a straight contact under the combined action of temperature and pressure is crucial to the sealing performance, which requires the moving ring to have good wear resistance, corrosion resistance, heat resistance, thermal conductivity, self-lubrication, etc. performance. Recently, Evergreen Metal Thermal Spraying Co., Ltd. has carried out thermal spraying technology surface strengthening on the moving ring of a machinery company in Shandong. By using plasma spraying ceramic coating, the surface performance of the moving ring has been effectively improved.

The size of the moving ring for this plasma spraying process is φ910*40mm, the coating thickness is required to be 0.3mm, the roughness is Ra1.6-3.2, the coating is well bonded, and there is no blisters, pores, coating peeling and other phenomena. Plasma spraying is a material surface strengthening and modification technology. It is a new type of thermal spraying technology developed after flame spraying. It has high temperature characteristics, which is convenient for spraying high melting point materials; the speed of sprayed particles is high, the coating is dense, and the viscous strength is high; the thickness of the coating can be controlled as needed, the thermal influence on the workpiece is small, and the spraying efficiency is high. Materials can be freely selected and combined with other characteristics. Plasma spraying technology uses inert gas as working gas, so spraying materials such as ceramics are not easy to oxidize, which can better improve the protective performance of the coating.

After the ceramic coating is prepared by plasma spraying on the mechanical seal moving ring, the bonding strength is high, the porosity is low, the surface roughness is low, the surface hardness is more than 10 times higher than that of the ordinary moving ring, and the wear resistance, corrosion resistance and resistance Thermal, thermal conductivity, self-lubrication and other properties make the moving ring more durable and better to use.