摩擦副钢在含不同形貌纳米Fe3O4颗粒润滑油中的摩擦性能

Tribological Properties of Steel Pairs in Lubricant Oils with Nano-Particles of Fe_3O_4 with Various Morphologies

采用弱磁场辅助氧化共沉淀法制备不同形貌的纳米Fe3O4颗粒,并将改性后的颗粒分散添加到#40机油中进行金属摩擦副的磨损试验,采用扫描电子显微镜、X射线光电子能谱和Raman光谱观察和分析摩擦副钢的磨痕表面形貌和化学组成。结果表明:Fe3O4纳米颗粒被粘附在摩擦副钢表面,填补了摩擦表面的缺陷区域,对磨损表面起到一定的自修复作用,并且明显提高金属摩擦副的抗磨损性能。片状颗粒比八面体和无规则形貌颗粒,能够更好地在其摩擦面上形成一层或多层低剪切应力的固体保护层,使得减磨和自修复效果较好。

Nano-particles of magnetite（Fe3O4） with various morphologies,which were synthezed by a weakly magnetic field assisted oxidative co-precipitation method,were used as addictives in lubricant oils.The tribological tests with a designed steel pair system were carried out.The surface and chemical element states of the steel pair in the lubricant oils with and without the modified nano-particles were analyzed by scanning electron microscopy,X-ray photoelectron spectroscopy and Raman spectroscopy.The re-sults show that the modified nano-particles of Fe3O4 can adhere on the surface of steel pairs to form a self-repairing film that can im-prove the anti-wear properties of the steel pairs.Compared to the nano-particles with octahedral and irregular morphologies,the parti-cles with flaky shape as an additive in the lubricant oil could preferably form either a low shear stress mono-layer or a solid protective multi-layer,leading to the superior performance for wear reduction and self-repairing.