Abstract
Cr3C2 and graphite (Gr) reinforced Cu-Sn matrix composites were fabricated by powder metallurgy. The effects of Cr3C2 content (5, 10, 15, 20 wt%) on the microstructure, mechanical properties and tribological properties of studied composites were investigated. The results showed that Cr3C2 particles were well bonded to the copper matrix. The as-sintered Cu-Sn/20Cr3C2/5Gr composite achieved a microhardness of 120 HV, an ultimate compressive strength of 330 MPa, and a yield strength of 206.49 MPa. Cr3C2 particles improved the high-temperature stability of the composite with a softening temperature of 800 ℃. In addition, Cr3C2 particles had an inhibitory effect on plastic deformation and adhesive contact during wear, improving the wear resistance of composites. The average friction coefficient and wear rate of Cu-Sn/20Cr3C2/5Gr were 0.32 and 2.48 × 10-5 mm3·N−1·m−1, respectively. It was worth noting that the dominant wear mechanisms of the studied composites changed with increased Cr3C2 content, from adhesive wear to abrasive wear. This work was beneficial for developing copper matrix composites with high-temperature stability and enhanced wear resistance.
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