Thermal Conduction and Magnetic Properties of Magnetorheological Elastomers Dispersing Sendust Particles

Abstract

In this paper, the thermal and magnetic properties of the Sendust particles dispersed magnetorheological elastomer (MRE) were investigated experimentally. Sendust is the material whose saturation magnetization is high and coercive field strength is low. Two types of specimens were prepared: one was the Sendust particles randomly dispersed MRE and the other was the MRE having chain-like clusters of Sendust particles. The thermal conductivity of the MRE having chain-like clusters depends on the internal structure formed by the particles. When the volume fraction of particles is 15 vol.%, the thermal conductivity of the MRE in the direction parallel to the chain-like clusters is 1.43 times of that of the MRE with randomly dispersing particles, while the thermal conductivity of the MRE in the direction perpendicular to the chain-like clusters is 0.90 times of that of the MRE with randomly dispersing particles. The initial magnetic permeability of the Sendust particles dispersed MRE depends on the internal structure of dispersed particles, while the saturation magnetization of the MRE is determined by the volume fraction of particles in the MRE and hardly depends on the particle distribution.