【摘要】 以羰基铁粉为磁性颗粒、二甲基硅油为载液,添加聚乙烯吡咯烷酮、纳米SiO2和十二烷基硫酸钠,通过搅拌分散的方法制备磁流变液。采用自然观察法、SNB-1型数字式黏度计、MCR-301旋转流变仪和自制的表面张力智能测试仪分别对其沉降稳定性、零场黏度、流变性能和表面张力系数进行测试分析。结果表明:采用这种方法制备的磁流变液稳定性较好,30天内沉降率为10%且无板结现象,搅拌后易再分散;零场黏度较低;施加磁场强度250 kA/m时,其剪切应力达到39.97 kPa;表面张力系数与磁感应强度有关,磁流变液在加磁过程中的界面特征可通过其表面张力系数的变化方便且直观地呈现出来。更多还原

【Abstract】 With carboxyl iron powders as magnetic particles and dimethyl silicon oil as carrier fluid,the polyvinylpyrrolidone,nano-SiO2and dodecyl-Na2SO4(sodium lauryl sulfate)added,the magneto-rheological fluid was prepared by the stir dispersion method.The sedimentation stability,zero-field viscosity,rheological properties and surface tension coefficient of the magnetorheological fluid were test and analyzed by the natural observation method,SNB-1 digital viscometer,MCR-301 rotational rheometer and homemade surface tension intelligent tester,respectively.The results show that the stability of the magneto-rheological fluid prepared by the method is good,the sedimentation ratio is 10% within30 days and no harden phenomenon appears,the redispersion is quite easy after mixing;the zero-field viscosity of the magneto-rheological fluid is low;the shear stress reaches 39.97 kPa when the magnetic field intensity is 250 kA/m;the surface tension coefficient of the magnetorheological fluid is related with the magnetic induction intensity,the interface feature of the magnetorheological fluid with the increase of the magnetic induction intensity can be presented easily and intuitively through the change of surface tension coefficient.更多还原