Wear Resistance of Ti–Al–C MAX Phases …
613
5 is the same as of variant 7 obtained by two-stage technology. However, it is shown
that the level of parameter h for this material is lower than for the material of variant
7, and it is significantly lower than that of aluminum alloy (variant 8). According to
this, the material of variant 5 has a higher resistance to arc damage.
4 Conclusions
It is found that materials based on the Ti 3 AlC 2 MAX phase obtained only by hot
pressing (one-step technology) practically are not inferior in microhardness, strength,
and wear resistance to similar materials obtained by two-step technology (vacuum
synthesis and hot pressing). However, they cause intense wear of the copper specimens in the “composite–M1 copper” friction pair. It is shown that a significant reduction in copper wear can be achieved due to the formation of the porous microstructure
of the body material for such tribocouple by reducing the hot pressing pressure from
30 MPa to 15 MPa. For this case, wear resistance of the copper counterbody is nine
times higher than for the case of the “aluminum alloy–copper” tribopair that models
the interaction of the electrical contact inserts of trams pantographs with contact
wires of the catenary used in Ukraine.
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