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Dry sliding of powder metal based composites was carried out against steel counterbody under electric current of density higher 100 A/cm 2 . It was shown that the surface layers were transformed into tribolayers under these sliding conditions. An optical image of the possible deterioration of the tribolayer and a method for estimation its specific electrical resistance were presented. It was established by X-ray phase analysis that the tribolayers contained the initial phases and, sometimes, FeO. The relatively low electrical resistance of the tribolayer and the formation of FeO on the sliding surface corresponded to low wear of the composite without alloying metals in the primary structure. The tribolayers of composites with dissolved metals in the primary structure had high specific resistance, were not able to form FeO on their sliding surfaces and had strong deteriorations. This manifested itself as high wear. At the same time a manifestation of low electrical conductivity of the contact was observed. The catastrophic wear of both types of composites began at nearly equal power on the contact spots but at different current densities. It was concluded that the high wear was due to the absence of FeO on the sliding surface and weak relaxation of stresses in the friction zone of composites containing dissolved metals in their base.

Characteristics of dry sliding electric contact of sintered metal based composites at catastrophic wear onset