Effect of magnetic field on the lubricating performance of nano magnetorheological grease at different temperatures.

Purpose: The adverse effects of temperature on the lubricating properties of nano magnetorheological grease are reduced by applying of a magnetic field. Design/methodology/approach: Nano magnetorheological grease was prepared via a thermal water bath with stirring. The lubricating properties of the grease were investigated at different temperatures. Then the lubricity of the prepared nano magnetorheological grease was investigated under the effect of thermomagnetic coupling. Findings: As the temperature rises, the coefficient of friction of grease lubrication gradually increases, surface wear gradually increases and lubrication performance gradually decreases. Compared with grease, magnetorheological grease has a decreased coefficient of friction and enhanced lubrication effect under the action of a magnetic field at different temperatures. Originality/value: A lubrication method using a magnetic field to reduce the effect of temperature is established, thereby providing new ideas for lubrication design under a wide range of temperature conditions. [ABSTRACT FROM AUTHOR]