The wear and frictional properties of aluminum bronze lubricated with MoO_(3) (molybdenum trioxide) powder were studied at the temperature ranging from room temperature to 700 deg C. MoO_(3) powder accumulated on the sliding surface of counterpart stainless steel reduced friction and wear of both materials at the temperature from 500 to 700 deg C. The X-ray diffraction analysis of friction track revealed that the unknown material other than molybdenum oxide or copper oxide was genereted on the friction track of aluminum bronze slid against MoO_(3) coated counterpart at high temperature. As the result of diffraction peak identification comparing with the database, the generated material was supposed to be Cu_(3)Mo_(2)O_(9). It was suggested that the generated material acted as high temperature lubricant and reduced wear of materials and friction under high temperature conditions.
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