Current state and prospects of the development of electromechanical processing for gas-thermal coatings

Abstract

The article presents an overview of the works on electromechanical processing of plasma coatings performed at the Institute of Metallurgy and Materials Science of the Russian Academy of Sciences and VolgSTU. The results of changes in the physical, mechanical and operational properties of plasma-sprayed coatings after electromechanical processing are analyzed. The main approaches in the field of electromechanical processing of gas-thermal coatings are outlined. The use of a cooling liquid to protect the zone of electric contact heating contributes to the preservation of the chemical composition of the coating. High rates of heating and cooling of the local area in the contact zone of the coating and the electrode tool lead to the fixation of the fast-quenched structure in the coating. An increase in the coating temperature as a result of resistive heating with simultaneous surface plastic deformation contributes to a decrease in surface roughness, compaction of the coating and the passage of diffusion welding along the boundaries of the sprayed particles. After electromechanical processing, the coating microhardness, cohesive and adhesive strength, corrosion and wear resistance are increased.