Transactions of Nonferrous Metals Society of China The Chinese Journal of Nonferrous Metals

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Transactions of Nonferrous Metals Society of China

Vol. 26    No. 6    June 2016

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Effect of 10% Si addition on cathodic arc evaporated TiAlSiN coatings
Li-hui ZHU1, Cheng SONG1, Wang-yang NI2,3, Yi-xiong LIU2

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

ISSN 1004-0609
CN 43-1238/TG

ISSN 1003-6326
CN 43-1239/TG

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