Determination of coating adhesion strength from mechanical mixture of powders deposited by plasma spraying method on die steel Kh12MF

Abstract

This article presents the results of determining the adhesion strength of a composite coating with Kh12MF steel substrate deposited by plasma spraying method using a domestic installation UPU-3D. As a composite powder, a mechanical mixture of powders PR-NX17SR4 and tungsten carbide clad with nickel in various percentages is used. The sprayed samples are subjected to heat treatment at a temperature of 1025 °C. The adhesion strength is determined by the adhesive method according to GOST 9.304—87. It is found that the highest value of adhesion strength is achieved when using a powder containing equal parts of PR-NX17SR4 and clad tungsten carbide in its composition. It has been also found that heat treatment significantly of the powder to the substrate.