中国有色金属学报(英文版)
Transactions of Nonferrous Metals Society of China
| Vol. 26 No. 6 June 2016 |
（1. School of Materials Science and Engineering, Shanghai University, Shanghai 200072, China;
2. Kennametal Inc., 1600 Technology Way, Latrobe, PA 15650, USA;
3. Stryker Orthopaedics, 325 Corporate Drive, Mahwah, NJ 07430, USA）
Abstract:The effect of 10% Si (mole fraction) addition on TiAlSiN coatings was studied. Ti0.5Al0.5N, Ti0.5Al0.4Si0.1N and Ti0.55Al0.35Si0.1N coatings were deposited on WC-Co substrates by cathodic arc evaporation. The microstructure and mechanical properties were characterized by X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), scanning electron microscopy (SEM), nano-indentation measurement and scratch test. The mechanisms of how Si affects the properties and failure modes of TiAlSiN coatings were also discussed. The results show that the addition of 10% Si results in the formation of nc-(Ti,Al,Si)N/a-Si3N4 nano-composite structure. The hardness and toughness of TiAlSiN coatings increase, whereas the coating adhesion strength decreases. Compared with Ti0.55Al0.35Si0.1N coating, Ti0.5Al0.4Si0.1N coating has higher hardness but lower toughness. The dominant failure mode of TiAlN coating is wedging spallation due to low toughness and strong interfacial adhesion. The dominant failure mode of TiAlSiN coatings is buckling spallation due to improved toughness and weakened interfacial adhesion.
Key words: TiAlSiN coating; TiAlN coating; cathodic arc evaporation; adhesion strength
