The preparation of light magnetic materials and it's application on magnetorheological fluids

It is reported that preparation of magnetic material (nickel and cobalt) on the surface of light material. The density of the new material is low (Effective density of it is 2 ∼ 3 g/cm³). The sedimental stability of the new magnetorheological fluid made by light magnetic material is similar to that of the MR fluid made by carbonyl nickel powders containing lots of anti - sedimental agent. The apparent viscosity of new MR fluids under magnetic field is dozens of times as high as the inital viscosity. Therefore the problem of settling of solid particles under gravity can be effectively prevented by manufacturing magnetorheological fluids using the new material.