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Tribological Properties of HVOF-Sprayed TiB2-NiCr Coatings with Agglomerated Feedstocks

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Abstract

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.

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Acknowledgments

The financial support from the natural science foundation of China (Nos. 51271007 and 51541107) is gratefully acknowledged.

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Authors and Affiliations

  1. College of Materials Science and Engineering, Beijing University of Technology, Beijing, China

    Zichun Zhao, Hui Li & Tianlong Yang

  2. CRRC Institute, Beijing, China

    Hongbin Zhu

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  1. Zichun Zhao
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  2. Hui Li
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  3. Tianlong Yang
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  4. Hongbin Zhu
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Correspondence to Hui Li.

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Zhao, Z., Li, H., Yang, T. et al. Tribological Properties of HVOF-Sprayed TiB2-NiCr Coatings with Agglomerated Feedstocks. J Therm Spray Tech 27, 718–726 (2018). https://doi.org/10.1007/s11666-018-0714-2

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  • DOI: https://doi.org/10.1007/s11666-018-0714-2

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