ВПЛИВ ВОДНЕВО-ТЕРМІЧНОЇ ОБРОБКИ ПОРОШКІВ НА ЯКІСНІ ХАРАКТЕРИСТИКИ НАНЕСЕНИХ ПОКРИТТІВ

Abstract

The possibility of improving the properties of thermal sprayed coatings by hydrogen thermal treatment of powders for spraying is discussed in the present study. Since it is known that the powders can be contaminated with impurities during their preparation and storage. Thus, the influence of the hydrogen thermal treatment of WC, Al₂O₃, NiCrAlY, Ni₃Al, WC-12Co and Cr₃C₂-25NiCr powders at 800-1100 °С on the properties of coatings was investigated. It is shown that heat treatment of powders in hydrogen provides a substantial removal of impurities due to the formation of gaseous compounds with hydrogen. The deposition of these powders provides the coatings with improved physical and mechanical properties regardless of the nature of the material and the method of spraying, in contrast to the coatings that were obtained from untreated powders. As a result, coatings with improved physical and mechanical properties can be obtained from these powders, in contrast to the coatings that were obtained from the untreated powders, regardless of the composition of the material and the method of spraying Key words: hydrogen, hydrogen thermal treatment, impurities, coating, detonation spraying, plasma spraying, mechanical properties.