Abstract
In this study, the research results of the influence of pulsed plasma treatment on phase composition, hardness, and roughness of Cr3C2-NiCr coatings are presented. The Cr3C2-NiCr coating was applied to substrate 12Kh18N10T stainless steel by detonation spraying method. To change the physical and mechanical properties of sprayed coating’s surface layers, subsequent pulse-plasma treatment was used. The pulse-plasma treatment leads to changing the roughness of Cr3C2-NiCr coating. The results of mechanical tests showed that after pulsed plasma treatment, the hardness of Cr3C2-NiCr coating is increased. Based on X-ray diffraction analysis, it was found that the hardness increasing of coating is associated with phase transformations on the surface layer, in particular, the formation of the oxide phase and an increase in the number of carbide particles.
Highlights
The application of protective coatings to improve the mechanical, physico-chemical and tribotechnical properties of metals and alloys, products made from them are an actual area of materials science, solid state physics, plasma physics, chemistry, etc. [1,2,3].Eurasian Journal of Physics and Functional Materials, Vol.5(1).Cr 3 C 2 -NiCr coating are widely used to protect against wear of working parts at high temperatures
After 1 pass plasma treatment has Ra =5.73 roughness value and after 2 passes have Ra =5.31, which is almost 2 times less than the roughness index before treatment. This is related the treatment of coating surface with a plasma jet, after which the particles or fragments of powder rising above the surface melt, and the surface roughness is reduced by ≈ 48%
Based on X-ray diffraction analysis, it was found that the increase in the hardness of Cr 3 C 2 -NiCr coatings after pulsed plasma hardening is associated with increasing carbide particles in the near-surface layer, and it is associated with the formation of Cr 2 O 3 chromium oxide
Summary
The application of protective coatings to improve the mechanical, physico-chemical and tribotechnical properties of metals and alloys, products made from them are an actual area of materials science, solid state physics, plasma physics, chemistry, etc. [1,2,3].Eurasian Journal of Physics and Functional Materials, Vol.5(1).Cr 3 C 2 -NiCr coating are widely used to protect against wear of working parts at high temperatures. The research results of the influence of pulsed plasma treatment on phase composition, hardness, and roughness of Cr 3 C 2 -NiCr coatings are presented. To change the physical and mechanical properties of sprayed coating’s surface layers, subsequent pulse-plasma treatment was used.
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