Tribological Properties of HVOF-Sprayed TiB2-NiCr Coatings with Agglomerated Feedstocks
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Boride materials have drawn great attention in surface engineering field, owing to their high hardness and good wear resistance. In our previous work, a plasma-sprayed TiB2-based cermet coating was deposited, but the coating toughness was significantly influenced by the formation of a brittle ternary phase (Ni20Ti3B6) derived from the reaction between TiB2 and metal binder. In order to suppress such a reaction occurred in the high-temperature spraying process, the high-velocity oxygen-fuel spraying technique was applied to prepare the TiB2-NiCr coating. Emphasis was paid on the microstructure, the mechanical properties, and the sliding wearing performance of the coating. The result showed that the HVOF-sprayed coating mainly consisted of hard ceramic particles including TiB2, CrB, and the binder phase. No evidence of Ni20Ti3B6 phase was found in the coating. The mechanical properties of HVOF-sprayed TiB2-NiCr coating were comparable to the conventional Cr3C2-NiCr coating. The frictional coefficient of the TiB2-NiCr coating was lower than the Cr3C2-NiCr coating when sliding against a bearing steel ball.
KeywordsTiB2-NiCr coatings HVOF mechanical properties sliding performance
The financial support from the natural science foundation of China (Nos. 51271007 and 51541107) is gratefully acknowledged.
- 12.J.F. McIlwain and L.A. Neumeier, Plasma-Sprayed Iron-Base Wear-Resistant Coatings Containing Titanium Diboride, RI8984, United States department of the interior, USA, 1985Google Scholar
- 13.J.A. Sue Jr., R.C. Tucker, A.J. Stavros, and Praxair S.T. Thchnology Inc., Method for producing a TiB 2-based coating and the coated article so produced, Bareford, Katherine A. European patent 0748879A1, 18 December 1996.Google Scholar
- 24.M.X. Xie, S.H. Zhang, M.X. Li, W.G. Wan, and G.H. Li, High temperature wear resistance of HVOF sprayed Cr3C2-25NiCr coating, Trans. Mater. Heat. Treat., 2012, 33, p 129-133Google Scholar