Abstract
In this paper, we present a newly developed rare earth modified amorphous barium strontium titanate (Ba x Sr 1− x TiO 3) gel/silicone oil electrorheological (ER) fluid. The ER behaviors of suspensions of pure and rare earth modified amorphous Ba x Sr 1− x TiO 3 particles in silicone oil have been investigated under a dc electric field. The shear yield stress of the rare earth modified amorphous BaTiO 3 gel/silicone oil ER fluid could reach 14.9 kPa at E = 3.5 kV / mm while the leaking current density was very low, about 7.64 μA/cm 2. The ER fluids with a higher volume fraction had a higher current density and a higher shear yield stress under the same electric field. The ER fluid has a long-term stability against sedimentation. The problem of caking was not serious and the agglomerated particles could be easily broken up by strongly stirring.
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