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Friction and Wear Behavior of WS2/Zr Self-lubricating Soft Coatings in Dry Sliding Against 40Cr-Hardened Steel Balls

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Abstract

WS2 and WS2/Zr self-lubricating soft coatings were produced by medium-frequency magnetron sputtering, multi-arc ion plating and ion-beam-assisted deposition technique on the cemented carbide YT15 (WC + 15 % TiC + 6 % Co) substrates. Microstructural and fundamental properties of these coatings were examined. Sliding wear tests against 40Cr-hardened steel using a ball-on-disk tribometer method were carried out with these coated materials. The friction coefficient and wear rates were measured with various applied loads and sliding speeds. The wear surface features of the coatings were examined using SEM. The results showed that the WS-1 specimen (with WS2/Zr composite coating) has higher hardness and coating/substrate critical load compared with that of the WS-2 specimen (only with WS2 coating). The friction coefficient of WS-1 specimen increases with the increase in applied load and is quite insensitive to the sliding speed. The wear rate of the WS-1 specimen is almost constant under different applied loads and sliding speeds. The WS-1 specimen shows the smallest friction coefficient and wear rate among all the specimens tested under the same conditions. The WS-1 specimen exhibits improved friction behavior to that of the WS-2 specimen, and the antiwear lifetime of the WS2 coatings can be prolonged through adding Zr additives. The self-lubricating and wear mechanism of the WS2/Zr coating was also found from the sliding wear tests.

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Acknowledgments

This work is supported by “National Natural Science Foundation of China (51375271),” “Taishan Scholar Program of Shandong Province,” “Independent Innovation Foundation of Shandong University (2011JC001)” and “Specialized Research Fund for Doctoral Program of Higher Education (20110131130002).”

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Authors and Affiliations

  1. School of Mechanical Engineering, Shandong University, Jinan, 250061, People’s Republic of China

    Yunsong Lian, Jianxin Deng, Shipeng Li & Guangyuan Yan

  2. Department of Industrial and Manufacturing Systems Engineering, Kansas State University, Manhattan, KS, 66506, USA

    Shuting Lei

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  1. Yunsong Lian
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  2. Jianxin Deng
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Correspondence to Yunsong Lian.

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Lian, Y., Deng, J., Li, S. et al. Friction and Wear Behavior of WS2/Zr Self-lubricating Soft Coatings in Dry Sliding Against 40Cr-Hardened Steel Balls. Tribol Lett 53, 237–246 (2014). https://doi.org/10.1007/s11249-013-0261-4

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  • DOI: https://doi.org/10.1007/s11249-013-0261-4

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