High-temperature Thermal Stability and Tribological Property of TiSiN/AlCrN Nano-multilayer Coatings

doi:10.3901/JME.2018.06.032

Abstract

Abstract: TiSiN/AlCrN multilayer coatings are deposited on cemented carbide substrate by arc ion plating. The microstructure, high-temperature thermal stability and tribological properties of the TiSiN/AlCrN coatings are investigated by scanning electron microscopy (SEM), transmission electron microscope(TEM), X-ray differaction (XRD), energy dispersive X-ray spectroscopy (EDS), revetest scratch test, nano-indentatio, tribology and vacuum annealing tests. The results indicate that the TiSiN/AlCrN coatings consist of c-Cr(Al)N and c-Ti(Si)N phases, exhibiting a typical columnar microstructure. The TiSiN/AlCrN illustrates a hardness of 49.7 GPa±0.83 GPa and adhesion strength of 83 N. After 800℃ and 900℃ vacuum annealing, the coating microstructure become more dense and the defect density decreased. However, both the coating hardness and bonding strength are not significantly changed. The high-temperature tribology tests suggest that the friction coefficient of the coating increases as the temperature increases from RT to 400℃. The friction coefficient decreases with further improving the temperature to 600-800℃. The wear rate of the coating increase monotonously as the test temperature increases. Both abrasive wear and plastic deformation produce the wear of the TiSiN/AlCrN coating at RT. However, adhesive wear and abrasive wear dominate the wear occurre at 400℃. As the test temperature increases to 600-800℃, the wear of the TiSiN/AlCrN coating is ascribed to the adhesive wear and the oxidation wear.

Key words: arc ion plating, microstructure, thermal stability, TiSiN/AlCrN coating, tribological properties

CLC Number:

TH321

LI Haixu, TANG Peng, WU Zhengtao, DAI Wei, WANG Qimin, QI Zhengbing. High-temperature Thermal Stability and Tribological Property of TiSiN/AlCrN Nano-multilayer Coatings[J]. Journal of Mechanical Engineering, 2018, 54(6): 32-40.

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