Brass-graphite composites were fabricated by adding graphite/Cu/Zn compactpowder usingthe stir-casting technique and their tribological behavior against a brass disk was studied under simulated actual conditions, in comparison with the common graphite/brass composite The tribological properties of the brass-graphite composite were compared with different percentages of graphite in the structure using the pin-on-disk method. The experimental results showed that the 7-9 wt. graphite creates a better wear resistance in high-pressure applications. Continuous Zn layers successfully covered the surface of the graphite particles, which could contribute to the improvement of interfacial wettability between graphite and brass. In this study, brass-graphite composites containing 8.4~15 wt. of Ni-coated graphite were fabricated. The friction coefficient of composites decreased with increasing graphite content. The wear resistance was improved by the addition of Ni-coated graphite but degraded at high graphite content. The results indicated this composite showed much better mechanical properties and tribological properties in comparison with brass. The composite with 11.7 wt. nickel-coated graphite showed the best tribological properties.
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