纳米Fe_3O_4在板带钢冷轧轧制液中的摩擦学性能

Tribological Properties of Nano-Fe_3O_4 as Additive in Cold Rolling Emulsion for Steel Strip

在超声波作用下,将经油酸表面修饰平均粒径为20 nm的纳米Fe3O4微粒分散于板带钢冷轧轧制液中,在MRS-10A四球摩擦磨损试验机上考察了其对钢/钢摩擦副摩擦磨损性能的影响;利用X射线衍射仪和透射电镜分析了纳米Fe3O4的相组成和微结构,采用光学显微镜观察了磨损表面形貌.利用四辊冷轧试验机进行了轧制液润滑下的板带钢冷轧试验,考察了纳米Fe3O4添加剂对板带钢冷轧润滑的效果.结果表明:纳米Fe3O4作为轧制液添加剂能有效提高钢/钢摩擦副的抗磨性能、降低摩擦系数,同时表现出良好的板带钢冷轧润滑效果;含纳米Fe3O4的轧制液可明显降低带钢最小可轧厚度,并改善轧制带钢板面质量.

Fe3O4 nanoparticles surface-modified with oleic acid,with an average size of 20 nm,were dispersed in a cold-rolling emulsion for steel strips.The tribological properties of the cold-rolling emulsion doped with nano-Fe3O4 nanoparticles were evaluated by using a four-ball machine.The phase composition and microstructure of nano-Fe3O4 nanoparticles were analyzed by means of X-ray diffraction（XRD） and transmission electron microscopy（TEM）.The worn surfaces of the steel balls were observed by using an optical microscope（OM）.Besides,the lubricity of the cold-rolling emulsion doped with nano-Fe3O4 nanoparticles for steel strip was evaluated on a cold-rolling tester by using the emulsion without nano-Fe3O4 nanoparticles as a reference.Results indicated that Fe3O4 nanoparticles as an additive in a cold-rolling emulsion were able to significantly improve the friction-reducing,antiwear,and extreme pressure properties of the base stock.Meanwhile,Fe3O4 nanoparticles also showed good lubricity to the cold-rolled steel strips.Namely,the steel strips cold-rolled under the lubrication of the cold-rolling emulsion containing nano-Fe3O4 nanoparticles possessed considerably decreased after-rolling thickness and improved surface quality as well.