The influence of temperature and of a longitudinal magnetic field upon the electrical conductivity of magnetorheological suspensions

The magnetorheological suspension (MRS) is based on mineral oil, stearic acid and iron micro-particles. The mean diameter of the iron micro-particles is 2.10 μm. MRS becomes conductive only in magnetic field, starting from intensities of 72 kA/m. By means of an experimental installation, described in this paper, the MRS function of temperature is measured (300 K⩽T⩽400 K) for intensities of the longitudinal magnetic field of 72, 112, 148 and 175 kA/m. From measurements of electrical resistance the electrical conductivity of MRS is determined, and the results obtained are discussed.