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The Preparation and Tribological Investigation of Ni–P Amorphous Alloy Nanoparticles

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Abstract

Amorphous Ni–P alloy nanoparticles were synthesized by chemical reduction of nickel acetate in water reacted with sodium hypophosphite under stirring. The nanoparticles were characterized by powder X-ray diffraction (XRD), transmission electron microscopy (TEM), and X-ray photoelectron spectroscopy (XPS). Results of XRD and TEM showed that nanoparticles have an average diameter 100 nm. And XPS analysis indicated that part of the surface of Ni–P amorphous alloy nanoparticles was oxidized. The tribological properties of the prepared Ni–P nanoparticles as an additive in lithium grease were evaluated with a four-ball friction and wear tester. The worn surfaces of the lubricated GCr15 steel were analyzed by means of XPS and scanning electron microscopy (SEM). The lubricating mechanisms were discussed on the basis of XPS and SEM analyses of the worn steel surfaces. The results show that these nanoparticles as a grease additive can effectively enhance the friction-reduction and antiwear ability of lithium grease. Tribochemical reactions were involved for steel–steel frictional pair lubricated with the lithium grease containing amorphous Ni–P alloy nanoparticles, with the formation of a boundary lubricating and protecting film composed of additives of lithium grease and tribochemical reaction products (iron phosphate, iron oxides, nickel oxide, nickel, etc.) of the lubricants. This contributes to improve the tribological properties of the lithium grease.

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Acknowledgment

The financial support from the National Basic Research Program of China (Grant No. 2007CB607606) and the National Natural Science Foundation of China in the name of “Innovative Group Fund” (Grant No.50421502) were gratefully acknowledged.

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Authors and Affiliations

  1. Institute of Material Science and Engineering, He’nan Polytechnic University, Jiaozuo, 454000, China

    Libo Wang

  2. State Key Laboratory of Solid Lubrication, Lanzhou Institute of Chemical Physics, Chinese Academy of Sciences, Lanzhou, 730000, China

    Libo Wang, Weimin Liu & Xiaobo Wang

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  1. Libo Wang
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  2. Weimin Liu
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Correspondence to Libo Wang.

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Wang, L., Liu, W. & Wang, X. The Preparation and Tribological Investigation of Ni–P Amorphous Alloy Nanoparticles. Tribol Lett 37, 381–387 (2010). https://doi.org/10.1007/s11249-009-9536-1

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  • DOI: https://doi.org/10.1007/s11249-009-9536-1

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