离心铸造铝铜合金的摩擦磨损性能研究

摘要

采用M2000的磨损实验机和扫描电镜研究离心半径和旋转速度对铝铜合金摩擦磨损性能的影响.结果表明,磨损量和摩擦系数随旋转速度和离心半径的增加而减小.并且在600 r/min时随着离心半径越大引起的磨损量减小的幅度大于在300r/min时磨损量减小的幅度.这是由于随着旋转速度和离心半径的增加,铝铜合金的显微组织越来越细小、晶界得到强化,造成铝铜合金的硬度、强度增加,所以耐磨性更强.%Effect of centrifugal radius on friction and wear properties of Al-Cu alloy for various mould rotation speeds was investigated by M200 wear test machine and SEM The results show that,with increasing the centrifugal radius or mould rotation speed the wear properties increase gradually.With increasing the centrifugal radius,the variation amplitude of wear loss of Al-Cu alloys at mould rotation speed 600 r/min is greater than that at 300 r/min.This is due to the finer microstructure and the strengthened grain boundary and then resulting in the hardness,strength of Al-Cu alloy increasing,so the wear resistance.