Microstructure and mechanical properties of Cr–Ni–N coatings deposited by HiPIMS

D. H. KimSchool of Materials Science and Engineering, Pusan National University, Busan609-735, South Korea

T. F. ZhangDepartment of Applied Hybrid Materials, School of Convergence Science, Pusan National University, Busan609-735, South Korea;Global Frontier R&D Center for Hybrid Interface Materials, Pusan National University, Busan609-735, South Korea

J. H. ShinGlobal Frontier R&D Center for Hybrid Interface Materials, Pusan National University, Busan609-735, South Korea;National Core Research Center for Hybrid Materials Solution, Pusan National University, Busan609-735, South Korea

M. C. KangDepartment of Applied Hybrid Materials, School of Convergence Science, Pusan National University, Busan609-735, South Korea;Global Frontier R&D Center for Hybrid Interface Materials, Pusan National University, Busan609-735, South Korea

K. H. KimSchool of Materials Science and Engineering, Pusan National University, Busan609-735, South Korea;Global Frontier R&D Center for Hybrid Interface Materials, Pusan National University, Busan609-735, South Korea;National Core Research Center for Hybrid Materials Solution, Pusan National University, Busan609-735, South KoreaCorrespondence[email protected]

Abstract

Cr–Ni–N coatings, the Ni content of which was altered from 0 to 6·3 at-%, were deposited by a hybrid coating system consisting of high power impulse magnetron sputtering and radio frequency magnetron sputtering. The effects of Ni addition to Cr-N coatings on the microstructure and mechanical properties of the coatings were investigated in this study. The instrumental analysis revealed that the Ni element was incorporated into Cr-N crystals as solid solutions, while excess Ni was precipitated as nanocrystalline phases at the Cr-N grain boundaries. The toughness of the Cr–Ni–N coatings was significantly improved with Ni content increased. In addition, the hardness of the coatings slightly increased from 30·4 to 32·6 GPa due to the grain refinement effect and solid solution hardening. From the tribological tests, the highest wear resistance was obtained from the sample having a Ni content of 2·7 at-%.

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Acknowledgements

This research was supported by Global Frontier Program through the Global Frontier Hybrid Interface Material of the National Research Foundation of Korea funded by the Ministry of Science, ICT & Future Planning (2013M3A6B1078874).

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