Abstract
NiAl-Ag2Mo2O7 composite coatings were prepared with different contents of Ag2Mo2O7 (0– 15 wt%) by spark plasma sintering (SPS) technology, in which Ag2Mo2O7 was synthesized through hydrothermal method. The mechanical and tribological properties of the composite coatings were investigated from room temperature (RT) to 800 °C, and the corresponding lubrication mechanisms were also revealed. The results show that Ag2Mo2O7 is decomposed into Ag, MoO3 and Mo2C phases during sintering process. NA10 (NiAl-10wt%Ag2Mo2O7) presents excellent tribological properties, especially at 800 °C, the friction coefficient and wear rate reach the lowest value of 0.29 and 6.15 × 10−5 mm3/(N·m), respectively. The significant improvement of tribological properties is attributed to the formation of a synergistic lubricating glaze layer composed of NiO, NiMoO4, Ag2MoO4 and Ag2Mo2O7 by tribo-chemical reaction on the worn surface.
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