CALCULATION OF THE INFLUENCE OF TEMPERATURE FIELDS ON THE QUALITY OF THE RESULTING COMPOSITE COATINGS

Abstract

Increased attention is currently being paid to improving the reliability and efficiency of power units. The use of materials with special coatings that have the necessary set of characteristics allows you to increase the service life of the restored components and assemblies. One of the ways to obtain such coatings is by plasma spraying. (Research purpose) The research purpose is in predicting the performance indicators of composite coatings using a mathematical tool that adequately describes the process of coating build-up during plasma spraying. (Materials and methods) Authors used a universal UPU-3 installation with modifications to produce coatings, which allowed controlling the heat transfer process with high accuracy. Authors used small-sized cooling water temperature sensors located at the connection point of the current-carrying hoses to the sprayer to record the enthalpy of the jet. During the coating process, the restored part remained stationary, and a plasma torch carried out the movement along the sprayed part. The advantage of this method is the independence of the mass of the recovered parts from the drive power of the plasma torch. (Results and discussion) The article presents the mathematical model, which is a system of nonlinear partial differential equations describing the process of heat transfer during the application of plasma-sputtered coatings, taking into account the initial conditions determined using the UPU-3 installation. To solve the presented system of nonlinear differential equations, the method of perturbation theory with the use of thermal potentials is used. (Conclusions) The article proposes the ways to solve the problem of heat transfer during the application of plasma-coated coatings, which allow us to predict the performance indicators of the restored parts.