In order to strengthen the wear resistance and braking effect of copper-based powder metallurgy friction materials,the copper-based friction materials reinforced by alumina were prepared by powder metallurgy (PM) method.The effects of alumina doping on the microstructure and friction behavior of friction materials were studied by means of Brinell hardness tester,scanning electron microscopy (SEM),energy dispersive spectrometer (EDS) and friction and wear experiments.The results show that the alumina hard particles are uniformly distributed in the copper matrix of the copper-based friction materials.The pinning effect of dislocation caused by the existence of the hard phase has a significant increase in the hardness of the composites,but has a certain negative effect on the density of the composites.The friction experimental results show that alumina can improve the friction coefficient and enhance the wear resistance of the material.With the increase of load,the friction coefficient of Al2O3-Cu composites is higher and the stability is better,and the wear rate is significantly reduced,indicating that the doping of alumina has a significant enhancement effect on copper-based materials.Through optical microscope and EDS analysis,it is found that the main wear mechanism of Cu-based material is oxidation wear and adhesive wear,while the wear mechanism of Al2O3-Cu material is mixed wear of oxidation wear and abrasive wear.