【摘要】 以羰基铁粉为磁性颗粒,硅油为载液,添加了硅烷偶联剂和纳米SiO2,通过球磨机球磨分散的方法制备磁流变液;采用NXS-11D旋转黏度计、自然沉降法和MRTS-01型磁流变仪分别对其黏度、沉降稳定性和流变性能进行了测试。结果表明:磁流变液零场黏度较低,为0.675 Pa.s,零场黏度随着剪切速率的增大而减小,表现出剪切稀化现象,属于弱Bingham流体;磁流变液具有较好的沉降稳定性,3个月的沉降率为13%,无板结现象,搅拌很容易再分散,表现为软性沉降;在磁场强度为0.6 T时,剪切应力能够达到60 kPa。更多还原

【Abstract】 Taking carboxyl iron powders and silicon oil as magnetic particles and carrier fluid separately,adding silane coupling agent and nano-SiO2,magneto-rheological fluid was prepared by the method of using ball mill to disperse.Through utilizing NXS-11D rotational viscometer,natural sedimentation method and MRTS-01 magnetic rheometer to test viscosity,sedimentation stability and rheological properties of the magneto-rheological fluid.The results show that zero-field viscosity of the magneto-rheological fluid was low which was 0.675 Pa·s.It decreased with the increasing of shear rate and showed shear-thinning phenomenon,which manifested the magneto-rheological fluid belonged to weak Bingham fluid.The fluid had good sedimentation stability,whose sedimentation rate for 3 months was 13% and no harden phenomenon appeared.It was quite easy to re-disperse after mixing,that presented as soft sedimentation.The shear stress could reach 60 kPa when the magnetic field intensity was 0.6 T.更多还原