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High Wear Resistance of Magnetron Sputtered Cr80Si20N Nanocomposite Coatings: Almost Independent of Hardness

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Abstract

Hardness has been popularly considered as an essential factor defining the wear resistance of hard coatings. Here, we report magnetron sputtered Cr80Si20N nanocomposite coatings, of widely varied packing densities, that exhibited identical specific wear rates, while the hardness changed over a wide range (from ~12 to ~36 GPa). All the Cr80Si20N coatings were free of extended and uninterrupted columnar boundaries, and retained low specific wear rates in the ball-on-plate sliding tests against Al2O3 counterpart with a normal load of 5 N (less than 3.0 × 10−16 m3/N m under ambient condition and less than 2.0 × 10−15 m3/N m under 3.5 wt% NaCl solution, respectively). Post examination reveals extensive interruption or termination of cracks in the wear tracks of the under-dense coatings, indicative of extrinsic toughening mechanisms by effective relief of local contact stress. Our results suggest that a critical role of toughening rather than hardening, played in enhancing the wear resistance of hard coatings, and thus would pave a way to develop highly wear-resistant coatings with a low hardness.

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Acknowledgements

This Research is supported by National Key R&D Plan (No. 2016YFC1400605), Zhejiang Key Research and Development Program (No. 2017C01001), Natural Basic Research Program of China (No. 2014CB643302), Applied Research Funds for Public Welfare Project of Zhejiang Province (No. 2016C33094).

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Correspondence to Feng Huang.

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Ge, F., Jia, C., Li, K. et al. High Wear Resistance of Magnetron Sputtered Cr80Si20N Nanocomposite Coatings: Almost Independent of Hardness. Tribol Lett 66, 70 (2018). https://doi.org/10.1007/s11249-018-1022-1

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  • DOI: https://doi.org/10.1007/s11249-018-1022-1

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