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Magnetic and magnetorheological properties of flowable compositions based on barium and strontium ferrites and iron oxides

Magnetic and magnetorheological properties of a number of compositions are examined. The compositions are based on barium and strontium ferrites, magnetite, and (gamma) -Fe2O3, both commercial and synthesized using specially developed methods, suspended in transformer oil and synthetic binders based on phenol-formaldehyde, epoxyacrylic and pentaphthalic resins. The influence of numerous factors, such as the type and magnetic properties of the filler, types of the binder, magnetic properties of the composition on the orientational effect of the filler in a magnetic field was evaluated. The latter was judged by a magnitude of magnetorheological effect.