Abstract
The possibility of reusing waste metals as alternative raw materials for producing materials for friction applications was investigated. The Ti-matrix composites containing 40 wt.% of waste Ti with fixed powder additions of 25 wt.% Fe, 10 wt.% ZrO₂, 5 wt.% SiC, 5 wt.% graphene nanoplatelets (GNPs), and 15 wt.% of alternative additions of waste metallic materials, namely MgAl, CuZn, Al, were prepared by mechanical milling and mixing of powders and subsequent compactization using spark plasma sintering (SPS) technique in vacuum at process parameters 1000 °C and 50 MPa for 10 min. As confirmed by microstructural and tribological analyses, all studied composites exhibited satisfactory average hardness values (220-350 HV 5) and coefficient of friction (0.5-0.7). Obtained results on wear resistance indicated that among all the currently studied composites, the developed metal-ceramic composite 40Ti-25Fe-15MgAl-10ZrO₂-5SiC-5GNPs has the most promising potential to be applied for intended friction applications.

Key words
metal matrix composites, metal waste reuse, SPS, friction, wear, graphene

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