Effect of 10% Si addition on cathodic arc evaporated TiAlSiN coatings

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• 作者：Li-hui ZHU^a ; ^{lhzhu@i.shu.edu.cn" class="auth_mail" title="E-mail the corresponding author} ; Cheng SONG^a ; Wang-yang NI^b ; ^c ; Yi-xiong LIU^b
• 关键词：TiAlSiN coating ; TiAlN coating ; cathodic arc evaporation ; adhesion strength
• 刊名：Transactions of Nonferrous Metals Society of China
• 出版年：2016
• 出版时间：June 2016
• 年：2016
• 卷：26
• 期：6
• 页码：1638-1646
• 全文大小：3142 K

文摘

The effect of 10% Si (mole fraction) addition on TiAlSiN coatings was studied. Ti_0.5Al_0.5N, Ti_0.5Al_0.4Si_0.1N and Ti_0.55Al_0.35Si_0.1N 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 Ti_0.55Al_0.35Si_0.1N coating, Ti_0.5Al_0.4Si_0.1N 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.