Abstract
ABSTRACT The paper considers the effect of C02-laser fusing on wear resistance of a plasma coating made of self-fluxing powdered materials. The coefficient of mixing, depending on the depth of a melted layer and plasma coating thickness, is chosen as the characteristics of laser fusing. Wear resistance tests have shown that there is a specific range of mixing coefficientvalues within which wear resistance of fused plasma coatings is minimum. The data of micro-X-ray spectrum and X-ray spectrum analysis of the treating surface have shown that the increase of wear resistance is caused by the formation of strengthening phases that occurs at the given conditions of laser fusing.Key words: Laser treatment, plasma spraying, coating, structure, chemical composition, wear resistance, friction INTRODUCTION Nowadays plasma spraying of protective coatings is one of the promising methods for increasing the wear resistance ofthe parts of machines and mechanisms [1]. To provide the required strength of adhesion to the base, plasma coatings aresubjected to fusing by different methods: in the heat-treatment and induction furnaces, in the high-temperature gas jet, by
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