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利用多元醇软化学方法制备了 Co- Ni超细颗粒 ,将 Co- Ni磁性颗粒与微孔材料通过粘结剂混合研磨 ,制得复合磁性颗粒 ,为了克服磁流变液的沉降稳定性 ,令复合磁性颗粒的密度等于载液的密度 ,各组分按此比例制备的 MRF具有较好的稳定性。利用旋转粘度计测试表明 ,无外场时 ,磁流变液的剪切应力 τ随剪切速率 γ变化的本构关系为 :τ=11.4γ0 .7,为一非牛顿液体。探讨了剪切应力和表观粘度系数随外加磁场和温度的变化关系 ,表明研制的 MRF的流变性质具有较高的低磁场敏感性质 ,并且具有较好的温度稳定性。
Co-Ni ultrafine particles were prepared by the polyol soft chemical method. Co-Ni magnetic particles and microporous materials were mixed and ground by a binder to obtain composite magnetic particles. In order to overcome the sedimentation stability of the MR fluid, The density of the composite magnetic particles is equal to the density of the carrier liquid. The MRF prepared according to the ratio of each component has better stability. The results of rotational viscometer show that the constitutive relationship of the shear stress τ of the MRF with the shear rate γ is: τ = 11.4γ0.7, which is a non-Newtonian liquid. The relationship between shear stress and apparent viscosity coefficient with the applied magnetic field and temperature was discussed. The rheological properties of MRF prepared by this method are characterized by high magnetic susceptibility and high temperature stability.