摘要
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。
Fine bimetallic Co-Ni alloy powders were prepared by polyose method. The composite magnetic particles were obtained by crushing and grinding the mixtures of ferromagnetic material, the microporous material and the binder. In order to overcome the sedimentation and separation of ferromagnetic and non-ferromagnetic phase, we set the density of the composite particles equal to that of dispersing liquid. The advantage of the present magnetorheological fluid (MRF) are the absence of sedimentation. In the absence of magnetic field, the variations of shear stress τy with shear rate is satisfied the constitutive equation, i.e., τ=11.4γ0.7. The variation of shear stress and apparent viscosity with the magnetic field strength are discussed. The present MRF manifests the higher-sensitivity of rheological properties on low magnetic strength.
出处
《功能材料》
EI
CAS
CSCD
北大核心
2001年第2期142-143,146,共3页
Journal of Functional Materials
