Abstract
Copper–graphite composites with different amounts of ball-milled expanded graphite (EG) were prepared through powder metallurgy. The composites were consolidated at 400MPa for 60s and then sintered for 2h at 850°C under vacuum condition. The bending and tribological properties of the composites were investigated. The bending strength of the composites decreases from 226.31MPa at 3wt.% ball-milled EG content to 85.61MPa at 12wt.% ball-milled EG content. The friction coefficient of the composites decreases from 0.3012 at 3wt.% ball-milled EG content to 0.0973 at 6wt.% ball-milled EG content, above which the friction coefficient increases slightly. The wear rate of the composites decreases with increasing ball-milled EG content and reaches a minimum value of 2.1×10−3mm3/m at 6wt.% ball-milled EG content, above which the wear rate of the composites also increases slightly.
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