The effect of molybdenum trioxide (MoO
3) on the friction and wear of aluminum bronze was studied at the temperature up to 973 K. MoO
3 powder supplied to the sliding interface between aluminum bronze and stainless steel reduced friction coefficient and wear of materials at the temperature from 773 to 973 K. Copper-molybdenum oxide was generated by sliding aluminum bronze and stainless steel in presence of MoO
3 powder at high temperature. This oxide is supposed to be Cu
3Mo
2O
9 from the results of XRD analysis of the friction track. The authors obtained Cu
3Mo
2O
9 powder by heating the mixture of MoO
3 powder and CuO powder in air. The lubricity of Cu
3Mo
2O
9 powder was compared with that of MoO
3 powder at the temperature up to 973 K. Cu
3Mo
2O
9 powder reduced wear and friction at the temperature from 773 to 973 K while MoO
3 powder could not work as lubricant at the temperature over 873 K.
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