Abstract: The base fluid is an important factor affecting the performance of magnetorheological fluids. Compared with traditional base fluids, ionic liquids have moderate viscosity and polarity, and can be used as base fluids for preparing new magnetorheological fluids. In this paper, 1-octyl-3-methylimidazole tetrafluoroborate ionic liquid is used as the base liquid, and carbonyl iron powder is used as the dispersed phase particles to prepare a magnetorheological fluid with a particle volume fraction of 20%. Performance comparison of magnetorheological fluids is investigated. The rheological test results show that the maximum shear yield stress of the ionic liquid-based magnetorheological fluid at 436 kA/m is 29% higher than that of the silicone oil-based magnetorheological fluid. The ionic liquid-based magnetorheological fluid has a more significant Magnetorheological effect.

DOI：10.3969/j.issn.1001-9731.2021.08.027