纳米AlOOH及纳米Fe_3O_4粒子在液体石蜡中的摩擦学性能研究

采用四球摩擦磨损试验机对表面修饰的纳米AlOOH粒子及纳米Fe3O4粒子在液体石蜡中的摩擦学性能进行了对比研究.结果表明:这2种纳米粒子均能提高液体石蜡的减摩耐磨性能和PB值,纳米AlOOH粒子因具有层状结构,表现出更好的减摩耐磨性能,随着纳米粒子粒径的增大,其减摩耐磨的最佳浓度出现升高的趋势.对磨斑表面的SEM、AFM和XPS分析结果表明,纳米粒子能沉积在摩擦副表面,减少摩擦副表面微凸体的直接接触,从而减少微凸体之间的犁削和黏着.

The Investigation of the Tribological Properties of Alooh and Fe3O4 Nanoparticles as Additives in Liquid Paraffin

The tribological properties of surface modified Fe3O4 and AlOOH nanoparticles as additives in liquid paraffin were evaluated and compared by a four-ball tester. The results show that the friction-reduction and antiwear properties and the PB value of liquid paraffin are improved by adding AlOOH or Fe3O4 nanoparticles as additives. The AlOOH nanoparticles exhibit better friction reduction, antiwear properties due to the lamella structure. The optimum concentration of nanoparticles shows the tendency of increase as the diameter of nanoparticles increases, and high volume concentration must be required to achieve the same PB value for nanoparticles with larger size. The results of the worn surface analysis with SEM, AFM and XPS show that the AlOOH or Fe3O4 nanoparticles can deposit on the worn surface and separate the direct contact between the asperities of the worn surface, which is effective in reducing the plough and adhesion between asperities.