Syntheses of nano-multilayered TiN/TiSiN and CrN/CrSiN hard coatings |
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| Authors: | Jiang-Li Cao Kwang-Leong Choy Hai-Lin Sun Hui-Qing Li Dennis Teer Ming-Dong Bao |
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| Affiliation: | (1) Institute for Advanced Materials and Technology, University of Science and Technology Beijing, Beijing, 100083, China;(2) School of Mechanical, Materials, Manufacturing Engineering and Management, University of Nottingham, Nottingham, NG7 2RD, UK;(3) Teer Coatings Ltd., Droitwich, Worcestershire, WR9 9AS, UK;(4) Institute of Materials Engineering, Ningbo University of Technology, Ningbo, 315016, China |
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| Abstract: | Nano-structured superhard coatings represent the state-of-the-art in the rapidly increasing worldwide market for protective
coatings. In this study, the combination of nano-composite and nano-multilayered structures into the same coating was attempted.
Nano-multilayered coatings of TiN/TiSiN and CrN/CrSiN were deposited on tool steel substrates by closed-magnetic-field unbalanced
DC magnetron sputter ion plating. The coating structures were characterized using X-ray diffraction, atomic force microscopy,
and scanning electron microscopy. Mechanical characterizations were performed including nano-hardness measurement, progressively-increasing-load
scratch test, and wear test. TiN/TiSiN coatings have a nano-hardness of 40.2 GPa, whereas CrN/CrSiN coatings have a hardness
of 30.9 GPa. TiN/TiSiN coatings also showed a higher critical failure force and scratch fracture toughness as well as better
wear resistance and lower acoustic emission signal, indicating less total damage to the coatings. |
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