球磨法制备磁流变液过程中转速对其性能的影响

Effect of rotate speed on magnetorheological fluid performance during its preparation by ball-milling method

以羰基铁粉为分散相,以硅油为连续相,采用高速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转速对其粘度、沉降稳定性、流变性能的影响。研究发现,球磨机的转速对磁流变液的粘度和沉降稳定性影响很大。随着球磨机转速的不断提高,其粘度呈现出先减小后增大的趋势,当转速为300r/min时,所获的零场粘度最低。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,在转速为400r/min,所获得的沉降稳定性最好,同时获得的剪切应力也最高。因此,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磨机的转速来改变磁流变液的零场粘度、沉降稳定性和流变性能。

Effects of rotate speed on magnetorheological fluid viscosity,sedimentation stability and rheological property are investigated during its preparation under taking carbonyl iron particle and silicone oil as dispersed phase and continuous phase separately while adopting the method of using high performance ball mill to disperse.The research showed that rotate speed greatly influenced the magnetorheological fluid performance.With constant increasing of rotate speed,the fluids viscosity presented decreasing first and then increasing trend,when rotate speed reached 300r/min,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.When rotate speed was 400r/min,it could get best sedimentation stability and highest shear stress.Therefore,basing on the fixed composition of magnetorheological fluid,the fluids viscosity,sedimentation stability and rheological property can be changed by changing ball mill rotate speed during magnetorheological fluid preparation.