【摘要】 为了提高铜基复合材料的强度和电导率,采用具有良好机械性能和热物理性能的ZrO2(3%(摩尔分数)Y2O3)作为增强相,原位化学法制备了ZrO2纳米颗粒增强铜基复合材料,其主要制备工艺包括前驱复合粉体CuO、ZrO2的制备,经氢气还原得到ZrO2/Cu复合粉,再经过压制,真空烧结,复压等工序制得最后的样品。研究了制备工艺包括初压压力,烧结温度、时间对材料性能的影响;结果表明,在初压压力为550MPa,975℃烧结1.5h时,可得到最佳性能复合材料。透射电镜观察表明,在ZrO2/Cu纳米复合粉中,氧化锆纳米颗粒形状为圆形和四方形,平均尺寸约为20nm左右。纳米ZrO2在基体中分布均匀,细化了晶粒,提高材料硬度,使复合材料具有良好的综合性能。随着ZrO2含量的提高,密度、电导率降低,硬度升高。更多还原

【Abstract】 To improve the intensity and electrical conductivity of copper matrix composite,nano ZrO₂ stabilized with 3mol% Y₂O₃ was selected as the reinforcement,which had good mechanical and thermal physical performance.The main fabricating technics included the preparation of the CuO,ZrO₂ precursor powder,reduction in H₂ atmosphere to acquire ZrO₂/Cu composite powder,then pressing,sintering in vacuum atmosphere,and repressing to acquire the final sample.Influence of first pressure,sintering temperature and time to composite performance were studied.Results showed that the best performance composite had been acquired when the first pressure was 550MPa,and sintering in 975℃ for 1.5h.TEM observation showed that the shape of nano zirconia was ball and cubic,and the average size was about 20nm in ZrO₂/Cu nanocomposite powder.Nano ZrO₂ distributed homogenous in matrix,thined the crystal size,and improved the material hardness in order to improve composite performance.With the increase of ZrO₂,density and hardness increased,but electrical conductivity decreased.更多还原