Abstract
TiSiN–Ag coatings were prepared by arc ion plating on Ti6Al4V at 450 °C. The as-deposited coatings were then annealed in a vacuum at 550, 650 and 750 °C for 30 min respectively to observe the Ag morphology and distribution in TiSiN coating. The microstructure evolution of the TiSiN–Ag coatings was characterized through scanning electron microscopy (SEM), revealing the segregation of Ag on the coating surface. The TiSiN–Ag coating annealed at 750 °C has denser structure, and more nanoscale to μm-size Ag outgrowths on the coating surface. The TiSiN–Ag coating annealed at 750 °C showed the highest hardness of 18.3 ± 1.5 GPa and maximum ratios H/E and H3/E*2, with excellent mechanical properties. For the annealed TiSiN–Ag coatings, the friction coefficient is relatively low, and the TiSiN–Ag coating annealed at 750 °C has the lowest wear rate.
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