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Preparation and Viscosity Characteristics of Nano-Scale Magnetic Fluid Oil-Film Bearing Oil.

As an alternative way to lubricating oil of oil-film bearing, a new type of nano-scale magnetic fluid oil for oil-film bearing was developed, which could be targeted to improve the lubrication performance of oil-film bearing and improve the load-carrying capacity. A new type of nano-scale magnetic fluid oil-film bearing oil was prepared by the co-precipitation technique based on industrial S-220 lubricating oil as the base carrier. The characterization of the prepared oxide was performed on powder X-ray diffraction (XRD), transmission electron microscopy (TEM) and vibrating sample magnetometry (VSM). The stability of nano-scale magnetic fluid oil was checked by magnetic sedimentation and centrifugation. Based on the modified Einstein formula, the viscosity of the magnetic fluid is analyzed from the temperature and magnetic field strength using an unifactor experiment method. The results show that the smaller the magnetic particle size in the magnetic fluid, the better the magnetic energy, dispersion and stability. The viscosity-temperature characteristic of nanoscale magnetic fluid is consistent with the theoretical analysis. Compared with the basic liquid, the viscosity-temperature characteristic of the magnetic fluid is obviously improved, which helps improve the lubrication performance of oil-film bearing and provides the basis for continuous lubrication.