Increasing of wear resistance of iron-based composite coating when restoring special equipment

The paper presents the results of determining rational composition of composite material based on PR-X11G4SR powder with fraction of 40-64 microns with addition of titanium carbide filler (TiC) for plasma spraying coatings, providing maximum microhardness and wear resistance. For this purpose, a multivariate experiment on the central composite rototable plan was designed and implemented. The following independent variables were selected: filler size (30-70 microns) and filler concentration (10-30 %). Adhesion strength of resulting coating to base of the samples was taken as response function. The study analyzed morphology and chemical composition of the obtained coating from iron-based powder and titanium carbide particles. It outlined aspects that explain reasons for improving resulting coating microhardness during plasma spraying.