Influence of Pulse-Plasma Treatment Distance on Structure and Properties of Cr 3 C 2 -NiCr-Based Detonation Coatings.

In this work, the coatings obtained by a combined method, including Cr₃C₂-NiCr coating applied using a multichamber detonation device and subsequent pulse-plasma treatment, were investigated. This paper presents the results of an investigation of the influence of the pulse-plasma treatment (PPT) exposure distance on the structural-phase state of the surface layer of Cr₃C₂-NiCr-based detonation coatings. It was seen that after the PPT melting and alignment of the structural elements of coatings there were no signs of coating destruction from the impact of plasma pulses. It was established that the microstructure of the coatings was a molten metal–ceramic material based on Cr₃C₂-NiCr. It was also found that after pulse-plasma treatment, Cr₂O₃ chromium oxide phases are found on the surface, and the intensity of Cr₃C₂ peaks increased and new Cr₃C₂ reflexes appeared. It was further found that after pulse-plasma treatment the microstructure became more homogeneous, which led to the densification of the Cr₃C₂-NiCr-based detonation coating. It was established that the pulse-plasma treatment (PPT) contributed to increased hardness of the Cr₃C₂-NiCr coating material, from ~13.4 GPa (before PPT) to ~17.6 GPa (after PPT) and wear resistance twice that of the non-treated coating. The abrasive wear resistance and erosion resistance of Cr₃C₂-NiCr coatings were improved after pulse-plasma treatment. [ABSTRACT FROM AUTHOR]