纳米锰方硼石粒径分布对铜基摩擦材料的影响  

Effect of nano-chambersite particle size distribution on copper-matrix friction materials

作　　者：舒晓宁[1] 曹林[1] 贾成厂[1] 梁栋[1] 龚立丽[1] 王聪聪[1] 

机构地区：[1]北京科技大学材料科学与工程学院,北京100083

出　　处：《粉末冶金材料科学与工程》2015年第2期187-193,共7页Materials Science and Engineering of Powder Metallurgy

基　　金：科技外事部资助项目;天津蓟县锰方硼石利用研究项目(1212011120272)

摘　　要：采用高能球磨法制备粒径小于200 nm的微细锰方硼石颗粒,将其作为摩擦填料添加到铜基摩擦材料中,利用放电等离子烧结(SPS)的方法制备出铜基摩擦材料。通过扫描电镜(SEM)、透射电镜(TEM)以及X射线衍射(XRD)研究纳米颗粒的形貌、显微结构与成分。在铜基摩擦材料中添加不同粒径的纳米锰方硼石,并通过摩擦磨损试验测试其磨损性能。结果表明:高能球磨法可以有效地细化锰方硼石;添加球磨处理的锰方硼石后所有样品的致密度均在97%以上,添加球磨50 min的纳米锰方硼石的样品致密度达到99%以上;稳定了摩擦因数(平均摩擦因数为0.187),磨损量为1.049×10-14 m3·J-1,抗压强度达到167 MPa;随着锰方硼石的细化,摩擦的样品磨损机理从剥层磨损与粘着磨损逐渐转向轻微的磨粒磨损。High energy ball milling craft was used to prepare chambersite particles less than 200 nm which was added to copper based friction material as friction filler, and then copper-matrix frictional materials were fabricated by spark plasma sintering （SPS）. Crystalline phases, morphology and particle size of chambersite powders were characterized by scanning electron microscope （SEM）, transmission electron microscope （TEM） and X-ray diffraction （XRD）. Nano-scaled particles of different size were added to copper-matrix frictional materials. Wear-resisting properties was studied through friction and wear experiments. The results show that high energy ball milling craft can refine chambersite effectively, the relative density of the samples are above 97% after adding chambersite. The optimum sample is the one which added chambersite milled for 50 min, the relative density of the sample is above 99% and the compressive strength is 167MPa; Its friction eoefticient has been effectively stable （average friction coefficient is 0.187）, and wear rate is 1.049 × 10^-14 m^3·j^-1.The gradually refining of chambersite causes a diversion of wear mechanism from adhesive wear and delamination wear to abrasive wear.

关 键 词：锰方硼石 粒径 摩擦 

分 类 号：TD879[矿业工程—非金属矿开采] TH117.1[矿业工程—矿山开采]