Tribological Behavior of Ni-based Self-lubricating Composites with the Addition of Ti₃SiC₂ and Ag₂W₂O₇

Abstract

The tribological properties of Nickel-based composites containing Ti₃SiC₂ and Ag₂W₂O₇ fabricated by spark plasma sintering against Si₃N₄ balls were investigated using a ball-on-disk tribometer from room temperature to 600 °C. The tribolayers formed on the friction surface and their effects on the tribological properties of composites at different temperatures were discussed based on the worn surface characterization. The results show that Ag₂W₂O₇ is decomposed into metallic silver and CrWO₄ during the high-temperature fabrication process. The composite with the addition of 20 wt% Ti₃SiC₂ and 5 wt% Ag₂W₂O₇ exhibits a friction coefficient of 0.33–0.49 and a wear rate of 7.07×10⁻⁵–9.89×10⁻⁵ mm³/(Nm) over a wide temperature range from room temperature to 600 °C. The excellent tribological properties at a wide temperature range are attributed to the formation of a glaze layer at low temperature and a tribooxide layer at high temperature, which can provide a low shearing strength for the synergistic effects of Ag and tribooxides.

Keywords

nickel-based composite / self-lubrication / wear / tribolayer / synergistic effect

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