添加油酸修饰的纳米Fe3 O4粒子润滑油的摩擦学性能研究

利用化学共沉淀法制备了平均粒径为10nm、油酸表面修饰的Fe3O4粒子，并对其作为润滑油添加剂的摩擦学性能进行了研究。试验结果表明，添加油酸修饰的纳米Fe3O4粒子的润滑油表现出了较好的抗磨减摩性能，但是，纳米粒子的添加量有一最佳值。与基础油相比，添加纳米Fe3O4粒子润滑油的摩擦因数最大降低了26％，磨损量降低了28％。在摩擦磨损过程中，添加纳米Fe3O4粒子润滑油的摩擦力矩的变化表现出了时间效应。添加纳米Fe3O4粒子润滑油摩擦磨损后的磨痕表面比基础油摩擦磨损后的磨痕表面光滑，可以推测，纳米Fe3O4粒子对摩擦表面的抛光作用提高了润滑油的摩擦学性能。

Study on the Tribological Properties of the Oils Adding Oleic Acid-modified Fe3O4 Nanoparticles

Fe_3O_4 nanoparticles of average diameter 10 nm,whose surface was modified with oleic acid,were prepared by chemical co-deposition method,and the tribological properties of the prepared nanoparticles as additive in 32# machine lubricating oils on M-200 tribotest were investigated.Results indicate the oils adding oleic acid-modified Fe_3O_4 nanoparticles exhibit good tribological properties.Friction coefficient decreases 26% maximally,and wear-scar width reduces 28% correspondingly.During the friction with the oils adding Fe_3O_4 nanoparticles,the variation of friction moment with time exhibits the time effect.The curve of surface topography shows that the worn surface obtained after tests with the oils adding Fe_3O_4 nanoparticles is smoother than that with the pure oils.Nano-Fe_3O_4 particles polishing the surface of friction pairs is contributed to the good tribological properties of the oils adding Fe_3O_4 nanoparticles.