DEPOSITION OF DUPLEX Cr3C2-NiCr COATINGS ON STEEL USING A COMBINED TECHNIQUE OF GAS DETONATION SPRAYING AND PULSE-PLASMA TREATMENT
Бауыржан Рахадилов, Yu. I. Tyurin, Dauir Kakimzhanov, Daryn Baizhan, О.В. Колисниченко, Laila Zhurerova
Abstract
Sintered chromium carbide - nickel-chromium alloys are widely used to protect machine parts operated in extreme conditions. In this research, a duplex technology was studied, including the deposition of Cr3C2-NiCr coatings using a multi-chamber detonation device and subsequent pulse-plasma treatment. It was determined that pulse-plasma treatment (PPT) promotes a decrease in the surface roughness and friction coefficient of the coating ~ 2 times, an increase in the microhardness of the Cr3C2-NiCr coating material from ~ 12 GPa (initial) to ~ 16.2 GPa and wear resistance by 2 times in compared to an untreated coating. It was also revealed that after the pulse-plasma treatment, the resistance of Cr3C2-NiCr coatings to abrasive wear and erosion increases. The proposed duplex technology ensures the formation of high-quality coatings from a cermet material of the Cr3C2-NiCr system with a complex heterogeneous structural-phase state, where a layered structure of regions of carbide particles and matrix metal was found in the immediate vicinity of the carbide-matrix interface with precipitates in the matrix of dispersed secondary carbides.