中文摘要：

以羰基铁粉为悬浮相，硅油为分散相，采用高速球磨机球磨分散的方法制备磁流变液，考察了磁流变液制备过程中球料比对其零场粘度、沉降稳定性、流变性能的影响。利用NXS-11A旋转粘度计、自然沉降法分别对磁流变液的零场粘度、流变性和沉降稳定性进行了测试，研究发现球料比对磁流变液的粘度和沉降稳定性影响很大。随着球料比的不断增加，其粘度呈现出先减小后增大的趋势，当球料比为3：9时，所获得零场粘度最低。其沉降稳定性与粘度有很好的对应关系，即粘度大的沉降速率慢，粘度小的则沉降速率快。在磁流变液组成成分不变的情况下，制备磁流变液的过程中可以通过改变球料比的方法来改变磁流变液的零场粘度和沉降稳定性。

英文摘要：

In this paper, effects of charge ratio on magnetorheological fluids viscosity, sedimentation stability and rheological property are investigated during its preparation under taking carbonyl iron powder and silicone oil as dispersed phase and continuous phase separately, adopting the method of using high speed ball mill to disperse magnetorheological fluids. Through utilizing NXS - 11A rotational viscometer and natural precipitation method to test magnetorheological fluids viscosity, sedimentation stability and rheological properties,the research showed that charge ratio greatly influenced the magnetorheological fluids performance. With constant increasing of charge ratio, the fluids viscosity presented decreasing first and then increasing trend, when charge ratio reached 3： 9, the obtained viscosity was lowest. There was a good corresponding relation between its sedimentation stability and viscosity that meant fluids with strong viscosity sedimentate lowly and fluids with weak viscosity sedimentate quickly. Stabling the composition of magnetorheological fluids, it is available to change viscosity and sedimentation stability of magnetorheological fluids by changing charge ratio during magnetorheological fluids preparation.