【作者】 高晶；

【导师】 郑冀；

【作者基本信息】 天津大学 ， 材料学， 2005， 硕士

【摘要】 本文采用粉末冶金法制备了纳米氧化锆增强铜基复合材料,分析研究了压制压力、ZrO₂含量对材料性能的影响。结果表明,当ZrO₂含量为8%时,Cu-ZrO₂复合材料具有最佳的综合物理力学性能。强化相纳米级ZrO₂粒子以弥散分布于铜基体内,有效的阻碍位错运动和晶界滑移,提高了铜基复合材料的强度和耐热性,并在保持高导电率的条件下,明显提高铜基复合材料的强度和硬度。在此基础上,通过考察材料的配方、工艺和性能及微观组织分析等手段,制备了一种机械强度高,摩擦磨损性能好的新型铜基自润滑复合材料。利用MG-2000型高速高温摩擦磨损实验机,考察该材料的摩擦学性能,使用扫描电子显微镜观察分析了磨损表面形貌,进而探讨了其摩擦磨损机理。正交设计试验结果表明,氧化锆和二硫化钼对摩擦学性能影响较为显著,石墨影响较小。通过正交设计实验,得到摩擦学性能最佳的铜基复合材料成分为:铜87%氧化锆5%石墨5%二硫化钼3%。研究表明这种材料的主要磨损形式为磨粒磨损、粘着磨损。更多还原

【Abstract】 The nano zirconia reinforced Cu-matrix composites were made by powder metallurgy method. The influence of pressure and the content of ZrO₂ on the performance of the composite were studied. The results show that the Cu-ZrO₂ composite has the best synthetic physical property when the content of ZrO₂ reaches 8 percent. Distribution of Nano ZrO₂ in copper is dispersed, which can prevent the movement of dislocation and the slipping of grain boundary so as to enhance the strength and the heat resistance of the composite as well as its hardness under high conductance. By the way, on the foundation of nano zirconia reinforced Cu-matrix composites, A novel self-lubrication copper matrix composite with high mechanical intensity and good performance of wear and friction has been prepared in this paper. We have reviewed the material’s component, technology, capability and microcosmic tissue. This kind of self-lubrication copper matrix composites have been fabricated by powder metallurgy route. A pin-on-disk wear testing machine was employed to evaluate it’s wear resistance, the worn surfaces were examined by scanning electron microscope, then its wear mechanism was discussed. Orthogonal experiment indicated that the influences of ZrO₂ and MoS2 on tribological properties are more notable than the influence of graphite. The self-lubrication copper matrix composites have the optimal tribological properties when the compositions are: Cu 87%, ZrO₂ 5%, G 5%, MoS2 3%.更多还原