Characterization of sedimentation and high magnetic field flow behavior of some magnetorheological fluids

Preparation and characterization of an improved sedimentation rate MR fluid is presented. Three different commercial additives were used for dispersion/stabilization of iron particles with sizes between 4-6 μm in synthetic oil carrier. The structural and magnetorheological properties of the sample (MRF-LM5) were compared with the same characteristics measured for a commercial MR fluid (MRF-132DG, LORD Co., USA) of similar saturation magnetization. The sedimentation rate of particles measured by X-ray transmission in MRF-LM5 is twice slower than in MRF-132DG, while the MR effect is higher for the commercial MR sample.