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.
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