In this study the surfaces of thermally sprayed nanocomposite Cr3C2 - 25NiCr coating have been treated by the pulsed plasma. The nanocomposite Cr3C2 - 25NiCr coating was deposited by a new multichamber gas-dynamic accelerator on grit blasted steel substrate. An automatic pulse-plasma device "Impulse-6" was employed to plasma treatment the surface of Cr3C2 - 25NiCr coating. The microstructure and wear resistance of the surface of the nanocomposite Cr3C2 - NiCr coating before and after the pulsed plasma treatment (PPT) was studied in this paper. Wear tests were carried out using a computer controlled pin-on-disc type tribometer at <$E25~symbol Р roman C>. The specific wear rate of the nanocomposite Cr3C2 - 25NiCr coating after PPT is approximately four times less than that of the Cr3C2 - 25NiCr coating before PPT, indicating that the nanocomposite Cr3C2 - 25NiCr coating after PPT exhibits better wear resistance. Detailed analysis indicates that the enhanced wear resistance of the nanocomposite Cr3C2 - 25NiCr coating after PPT is mainly attributed to the formation of an oxide tribolayer and smoother surface, which result from the dense and amorphous microstructure of the coating.

• Тюрін Юрiй Миколайович (технічні науки)

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