热挤压润滑油用纳米润滑添加剂润滑性能的研究  

Study on the Lubricating Properties of Lubricating Oils with Nanoparticle Additives in the Hot Extrusion of LY12

作　　者：宣瑜[1] 赵修臣[1] 李江国[2] 刘颖[1] 秦力维[1] 

机构地区：[1]北京理工大学材料科学与工程学院,北京100081 [2]北京机电研究所,北京100083

出　　处：《润滑与密封》2009年第4期14-16,共3页Lubrication Engineering

基　　金：北京理工大学优秀青年教师基金项目(2006Y0411);国家科技支撑项目(2006BAF02A11)

摘　　要：采用化学沉淀法分别制备了经表面修饰的纳米Fe3O4和纳米CuO粒子,在透射电镜下研究了纳米粒子的粒径大小、形貌及其分散性;在四球摩擦试验机上,研究了纳米Fe3O4和纳米CuO粒子对润滑油承载能力的影响,同时在CSS-2220型万能试验机上,对比研究了添加纳米Fe3O4和纳米CuO粒子的润滑油在LY12热挤压成形过程中的润滑性能。试验结果表明:所制备的纳米Fe3O4和纳米CuO粒子均呈球形、平均粒径分别为10和20nm,在润滑油中均具有良好的分散性;纳米Fe3O4和纳米CuO粒子均可以提高润滑油的最大无卡咬载荷,其中纳米Fe3O4粒子的性能优于纳米CuO粒子;添加纳米Fe3O4和纳米CuO粒子的润滑油均可降低挤压变形功,挤压件表面SEM形貌结果表明,纳米粒子的存在有效地隔离了挤压件与模具表面的直接接触,减少了挤压件表面犁沟数量,降低了热挤压变形功。The surface-modified Fe3O4 and CuO nanoparticles were prepared using chemical method. The size and shape distribution of the nanoparticles was studied by transmission electron microscopy. The load-bearing capacity of the lubrica- ting oils added Fe3O4 nanoparticles and CuO nanoparticles were evaluated with a four-ball tester. Lubricating properties of the lubricating oils added nanoparticles were investigated in the hot extrusion of LY12 using an electron omnipotence tester. The experimental results indicate that the average diameter of the surface-modified Fe3Q and CuO particles is about 10 and 20 nm respectively, and the shape of the prepared nanoparticles is approximately spherical. Both Fe3O4 nanoparticles and CuO nanoparticles have good dispersion capacity,which can improve the load-bearing capacity of the lubricating oils obviously, and Fe3O4 nanoparticles have better load-bearing capacity than CuO nanoparticles. Compared with base oil, the lubricating oils added both Fe3O4 and CuO nanoparticles can decrease the deformation work obviously. The SEM results show that nanoparticles prevent the asperity contact between die surface and work-piece surface and reduce the quantity of grooves in the surface of the hot-extruded work-piece, and cause the decrease of the deformation work.

关 键 词：纳米粒子 润滑油 添加剂 热挤压 

分 类 号：TG376.3[金属学及工艺—金属压力加工]