The effect of two nanoparticle oxides on friction and wear was studied under laboratory test conditions using a reciprocating test\nmachine and two test configurations. The addition of these nanoparticles in base stock oil under certain conditions reduced the\ncoefficient of friction and improved wear, but that depended on the test configuration. Examination of the rubbed surfaces showed\nthe pronounced formation of a tribofilm in some cases, while polishing on the surface was also observed in other cases. Contact\nconfiguration is important when oxide nanoparticles are being evaluated and the conclusions about their efficacy can be vastly\ndifferent.
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