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Coatings 2018, 8(2), 50; https://doi.org/10.3390/coatings8020050

Structural, Mechanical and Tribological Properties of NbCN-Ag Nanocomposite Films Deposited by Reactive Magnetron Sputtering

School of Materials Science and Engineering, Jiangsu University of Science and Technology, Mengxi Road 2#, Zhenjiang 212003, China
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Received: 13 December 2017 / Revised: 5 January 2018 / Accepted: 21 January 2018 / Published: 29 January 2018
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Abstract

In this study, reactive magnetron sputtering was applied for preparing NbCN-Ag films with different Ag additions. Ag contents in the as-deposited NbCN-Ag films were achieved by adjusting Ag target power. The composition, microstructure, mechanical properties, and tribological properties were characterized using energy-dispersive X-ray spectroscopy (EDS), X-ray diffraction (XRD), field emission scanning electron microscope (FE-SEM), high resolution transmission electron microscopy (HRTEM), Raman spectrometry, nano-indentation, and high-temperature sliding wear tests. Results indicated that face-centered cubic (fcc) NbN, hexagonal close-packed (hcp) NbN and fcc Ag, amorphous C and amorphous CNx phase co-existed in the as-deposited NbCN-Ag films. After doping with 2.0 at.% Ag, the hardness and elastic modulus reached a maximum value of 33 GPa and 340 GPa, respectively. Tribological properties were enhanced by adding Ag in NbCN-Ag films at room temperature. When the test temperature rose from 300 to 500 °C, the addition of Ag was found beneficial for the friction properties, showing a lowest friction coefficient of ~0.35 for NbCN-12.9 at.% Ag films at 500 °C. This was mainly attributed to the existence of AgOx, NbOx, and AgNbOx lubrication phases that acted as solid lubricants to modify the wear mechanism. View Full-Text
Keywords: NbCN-Ag films; magnetron sputtering; microstructure; tribological properties NbCN-Ag films; magnetron sputtering; microstructure; tribological properties
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Wu, F.; Yu, L.; Ju, H.; Asempah, I.; Xu, J. Structural, Mechanical and Tribological Properties of NbCN-Ag Nanocomposite Films Deposited by Reactive Magnetron Sputtering. Coatings 2018, 8, 50.

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