EFFECT OF VARYING THE PULSE-PLASMA TREATMENT DISTANCE ON THE PROPERTIES OF CR₃C₂-NICR DETONATION COATINGS

One of the most promising methods to improve the operational properties and increase the service life of products is the application of functional coatings using various sputtering technologies. Considering the high resistance to wear and corrosion of Cr₃C₂-NiCr metal-ceramic composition, such coatings have started to be actively used to protect steel elements in hot parts of boilers designed for waste incineration, as well as in electric furnaces and equipment operating on natural gas.This study examines the effect of pulse-plasma treatment distance on the structural characteristics of the surface layer of Cr₃C₂-NiCr detonation coatings. We study a process involving the deposition of such coatings using a detonation device and then their treatment by pulse plasma. The results show that after such treatment, melting and levelling of the structural components of the coatings occurs without leading to their destruction by the plasma pulses. The microstructure of the coatings is a molten Cr₃C₂-NiCr based metal-ceramic material. After pulse plasma treatment, Cr₂O₃ chromium oxide phases are found on the surface, the intensity of Cr₃C₂ peaks increases and new Cr₃C₂ reflections appear, indicating an increase in the Cr₃C₂ phase content. It is also observed that the microstructure becomes more homogeneous after this treatment, which leads to the densification of the Cr₃C₂-NiCr-based detonation coating.

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