INFLUENCE OF THE TECHNOLOGY OF PRODUCTION OF COMPOSITES BASED ON THE MAX PHASES OF TITANIUM ON THE PROCESS OF WEAR IN CONTACT WITH COPPER. PART 2. SINGLE-STAGE TECHNOLOGY

摘要

We study the microhardness, micromechanism of fracture, fracture resistance under static bending, and wear resistance of candidate materials for the electric-contact inserts of streetcar pantographs operating in couples with the material of the contact wire of the electric power network. The investigated materials for the inserts are composites based on Ti3AlC2 and Ti2AlC MAX-phases obtained by a single-stage technology (hot pressing). These materials are compared with the earlier investigated composites obtained as a result of synthesis in a vacuum and hot pressing ( two-stage technology) and with the aluminum alloy used for manufacturing the inserts of pantographs in Ukraine. It is shown that the wear resistances of the materials obtained by the single-stage and two-stage technologies are practically identical and much higher than for the aluminum alloy. However, they have different influence on the characteristics of wear of copper in the "composite (aluminum alloy) - M1 copper" tribocouples. The lowest degree of wear of the copper counterbody least is observed in the case of application of a porous composite impregnated with a glycerin solution. In this case, the wear resistance of copper is 50 times higher than in the couple with aluminum alloy.