采用高能球磨法, 通过改变Al2O3含量(质量分数)和调节球磨时间等参数, 烧结制备出不同含量Al2O3颗粒弥散增强的铜基复合材料; 通过显微组织观察、相对密度、电导率和硬度的测试, 研究了Al2O3含量和球磨时间对烧结体组织和性能的影响。结果表明: 球磨转速为270 r·min-1时, 随球磨时间延长, 铜晶粒细化和晶格畸变增加, 晶粒从片层状逐渐变为球状, 烧结体的相对密度先升高后降低, 电导率和硬度升高; 随着氧化铝含量的降低, 相对密度提高, 硬度先降后升, 含1.2% Al2O3时相对密度最大为89.4%, 电导率最高为50%IACS。

Using high energy ball milling method through changing the content (mass fraction) of alumina and milling time to sinter alumina particle dispersion reinforced copper matrix composites with different Al2O3 contents. The effects of alumina content and ball milling time on the microstructure and properties of the sintered body were studied by microstructure observation, relative density, conductivity and hardness test. The results show that when the milling speed was 270 r·min-1 and with prolonging the milling time, the grains refined and lattice distortion increased, the grains changed from laminar shape to spherical shape gradually. And the relative density of the sintered body increased first and then decreased, the conductivity and hardness increased. With the decrease of the content of alumina the relative density raised, the hardness decreased first and then increased. When the Al2O3 content was 1.2wt% the maxinal relative density was 89.4%, and the highest conductivity was 50%IACS.