| 摘要 |
PURPOSE:To develop a Cu-base composite material excellent in wear resistance even in lubricant free state, by mixing a graphite powder of a specific grain size whose surface is plated with Cu with a metallic powder mixture composed principally of Cu powder and by subjecting the resulting powder mixture to compacting, to sintering, and further to recompacting. CONSTITUTION:A uniform powder mixture consisting of, by weight, 3-20% of graphite powder which is coated with Cu by electroplating or electroless plating and in which aspect ratio and grain size are regulated to 4-8 and 50-400mum, respectively, and respective powders of Sn, Pb, Zn, Bi and Fe and the balance Cu powder is compacted at 4-7ton/cm<2> pressure into the prescribed shape. The resulting green compact is sintered at 700-850 deg.C, and the sintered compact is recompacted under 4-7ton/cm<2> pressure again. By this method, the Cu-base composite material in which graphite acts as solid lubricant and, as a result, which has superior wear resistance even in lubricant free state and is suitable for bearing, etc., can be obtained.
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