The structure, phase composition, and wear mechanisms of plasma-sprayed NKhTB20 coating (NiCrSiB–20 wt.% TiB2) are studied. To produce NKhTB20 composite powder, commercial PR-NKh16SR3 (NiCrSiB) powder was mixed with 20 wt.% TiB2 and the charge was pressed and sintered in vacuum at 1100°C for 30 min. During sintering, the components react to form chromium borides. The sinters were ground and classified into the particle size fraction –100+60 nm for plasma spraying. The plasma-sprayed NKhTB20 coating consists of a nickel-based matrix reinforced with titanium diboride and chromium boride grains. The friction and wear behavior of the NKhTB20 coating in dry friction against plasma-sprayed NiCrSiB and NKhTB20 coatings is examined. It is revealed that the NKhTB20/NiCrSiB friction pair has higher wear resistance than NKhTB20/NKhTB20. The contact surfaces of the NKhTB20/NKhTB20 friction pair are damaged under oxidative and abrasive wear mechanisms. Oxidative wear is the dominant mechanism for the NKhTB20/NiCrSiB friction surface. Complex oxide films form on the NKhTB20/NiCrSiB sliding surface and prevent it from damage.
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Hereinafter stated in wt.%.
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Translated from Poroshkovaya Metallurgiya, Vol. 53, No. 11–12 (500), pp. 57–68, 2014.
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Umanskii, A.P., Storozhenko, M.S., Hussainova, I.V. et al. Structure, Phase Composition, and Wear Mechanisms of Plasma-Sprayed NiCrSiB–20 wt.% TiB2 Coating. Powder Metall Met Ceram 53, 663–671 (2015). https://doi.org/10.1007/s11106-015-9661-3
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DOI: https://doi.org/10.1007/s11106-015-9661-3