Effects of P Contents on Tribological Properties of Fe/ZCuPb20Sn5 Bimetallic Copper Layer
Fe/ZCuPb20Sn5 bimetal was fabricated by solid-liquid compound method,and effects of P content on den-drite refinement,element segregation and precipitation behavior of the second phase in bimetallic copper layer as well as the tribological properties of copper layer were systematically investigated.The results indicate that P is distributed in the interval of α-Cu and α-(Cu,Sn),which reduces the segregation of Sn elements,leading to the precipitation of Cu3P strengthening phase and refinement of matrix.The friction coefficient and wear rate of copper layer are decreased gradually with increase of P content,reaching the minimum value at 0.3％.In the worn furrows,Pb surrounds Cu3P phase to generate self-lubricating layer,enhancing tribological properties of material.The wear mechanism is trans-formed from adhesive wear and peeling wear to abrasive wear with increase of P content.
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