MATHEMATICAL ANALYSIS OF THE SURFACE MODIFICATION PROCESS BY ELECTRIC SPARK ALLOYING METHOD

Abstract

The perspectives for the use of electrospark alloying to ensure the required surface quality are considered. The
parameters influencing the quality of the modified surface are analyzed. A mathematical model is proposed that takes into
account the number of thermal processes on the surface of the product. The model is based on the equation for the intensity
of the transferred energy heat flux, taking into account the evaporation of materials into the environment in accordance with
the law of conservation of energy. This makes it possible to describe the process of heat propagation in the coating during
electrospark alloying of a metal surface. It was taken into account that the temperature of the hardened surface depends on
the thermophysical characteristics of the anode and cathode, the diameter of the electrode, and also on the speed of movement
of the alloying electrode. It is shown that the larger the electrode diameter, the higher the temperature at the coating-base
interface, which means that the adhesion of the coating is better. To obtain better adhesion of the coating to the substrate, it is
necessary to use the largest electrode diameter of 4.5 mm in combination with a low electrode movement speed.