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New iron-based composites were investigated for applications within the friction materials domain. This study presents the elaboration and the structural and tribological characterization of iron-based friction composites containing iron, copper, graphite and/or nickel, introduced in a powder state. The technology employed for obtaining these materials is via a classical powder metallurgy route. The porosity of the studied materials, the tribological characterization, the roughness of researched composites and their structure are marked out. Results showed that the samples elaborated from the material with 10 wt.% Cu, 7 wt.% graphite, 12 wt.% Ni and the rest iron, compacted at 600 MPa, presented the best tribological behavior. The presence of pearlite, ferrite, nickel-based and copper-based solid solutions and free graphite in composite structures is highlighted.

Tribological and micro/nano-structural characterization of some Fe-based sintered composites