Abstract
Brass-graphite composites were fabricated by adding graphite/Cu/Zn compact powder 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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