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

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.