球磨时间对纳米SiO2/Cu复合材料摩擦学性能的影响

Effect of Milling Time on Friction Performance of Nano-SiO2/Cu Composite Materials

采用球磨法与热压烧结工艺制备了添加w（n-SiO2）=1.0%的铜基纳米复合材料。通过球盘式摩擦磨损试验机测试了复合材料的摩擦磨损性能,采用排水法和场发射扫描电镜（FSEM）研究了复合材料的致密度、显微组织和磨损形貌。结果表明：球磨可提高复合材料的致密度,改善n-SiO2在铜基体中的分散均匀性;随球磨时间的增加,复合材料的动摩擦因数和磨损量先减小后增加,球磨10 h复合材料具有较低的摩擦因数和磨损量,磨损机理主要为磨料磨损。

Cu-based nanometer composite materials with w（n-SiO2） = 1.0% are prepared through ball milling and hot pressed sintering. The friction performance of composite materials is investigated by balldisk friction and wear tester. The consistency, microstructure and wear morphology are studied by drainage and Field Scanning Electronic Microscope （FSEM） respectively. The results indicate that the ball milling can enhance the consistency of composite materials and increase the uniformity of the nano-SiO2 in the copper matrix. With the milling time increasing, the dynamic friction coefficient of the composite materials decreases firstly and then increases. The friction coefficient and wear rate of the composite materials milled 10 h are low and its wear mechanic is abrasive wear.