Examination of the thermal effect of an electron beam on a coating-substrate composite

摘要

One of the methods of improving the physical and mechanical properties of sprayed coatings is electron beam treatment.' If the amount of supplied energy is accurately controlled, the sprayed layer is melted resulting in the disappearance of macrodefects, and an improvement in the bonding strength of the substrate with the coating. A minimal thermal effect on the substrate is very important in the spraying of coatings on structural members. ~2 The applied cooling rates higher than 10~4 K/s in the process of solidification result in the formation of unique structures in the coating. ~3 The efficiency of the coatings, improved using this method, is ensured in the process of inspection of the processes of structure and phase formation of the material of the coating. This is carried out using mathematical models of thermophysical processes taking place in the molten pool and at the phase boundary in electron beam melting which make it possible to optimise and predict the possibility of formation of the required structures and strength characteristics of the material of the coating followed by experimental confirmation of the calculated data. ~(4,5)