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Tribological Investigation of Two Different Layered Zirconium Phosphates as Grease Additives Under Reciprocating Sliding Test

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Abstract

The tribological properties of α-Zr(HPO4)·H2O and Cu(OH)2Zr(HPO4)2·2H2O (α-ZrP and Cu-α-ZrP, respectively) were investigated in lithium grease by using an optimol SRV-V oscillating reciprocating friction and wear tester (SRV). α-ZrP had excellent anti-wear and friction-reducing properties regardless of the applied load, frequency, and test duration. The applied load for α-ZrP reached 600 N, and the corresponding friction coefficient was 0.082. At 60 Hz, the wear volume rate was 11.16 × 10−9 mm3/Nm. The tribological properties of Cu-α-ZrP were dependent on the test conditions, especially at higher frequency. The α-ZrP worn steel surfaces were smooth and shallow as indicated from scanning electron microscopy and a three-dimensional non-contact surface mapping profiler. Related elements were detected by energy-dispersive X-ray spectroscopy on the rubbed surfaces. A boundary solid film may form on the worn surfaces after friction tests. In reciprocating mode, α-ZrP stuck on the contacting surfaces, which enabled it to form a stable solid lubricant film more effectively than Cu-α-ZrP. The crystal structure may be important for film strength under high loads, especially at high speed.

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Acknowledgments

This work was supported by the Key Program of National Natural Science Foundation of China (21436008) and General Program of National Natural Science Foundation of China (51372162) and the Natural Science Foundation for Young Scientists of Shanxi Province, China (2015021032).

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Authors and Affiliations

  1. Research Institute of Special Chemicals, College of Chemistry and Chemical Engineering, Taiyuan University of Technology, Taiyuan, 030024, Shanxi, China

    Li Chen, Xiaosheng Zhang, Hong Xu & Jinxiang Dong

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  1. Li Chen
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  2. Xiaosheng Zhang
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  3. Hong Xu
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  4. Jinxiang Dong
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Correspondence to Hong Xu or Jinxiang Dong.

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Chen, L., Zhang, X., Xu, H. et al. Tribological Investigation of Two Different Layered Zirconium Phosphates as Grease Additives Under Reciprocating Sliding Test. Tribol Lett 64, 1 (2016). https://doi.org/10.1007/s11249-016-0730-7

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