| Manganese-zinc ferrite powder is the most widely used soft magnetic ferrite material.With the rapid development of microelectronic devices,traditional metal magnetic materials can not meet the requirements of existing devices,while manganese-zinc ferrite powder materials have high saturation magnetic induction,high permeability,low loss and high stability.Therefore,manganese-zinc ferrite powder materials gradually replace metal magnetic materials and have a very wide range of applications in the field of Electronic Science and technology.In recent years,the research on Mn-Zn ferrite powder is still in hot progress.It is necessary to develop high-performance Mn-Zn ferrite powder materials.Therefore,researchers began to study the preparation methods and process parameters of manganese-zinc ferrite in a more comprehensive and in-depth manner.Nowadays,various preparation methods such as high-energy ball milling,chemical coprecipitation,microemulsion method and sol-gel method have been studied energetically,and various methods have their advantages and disadvantages.High-energy ball milling is a mainstream method for industrial preparation of manganese-zinc ferrite materials.The prepared manganese-zinc ferrite materials have the advantages of stable performance,high saturation magnetization,large-scale production,and preparation of micron-sized manganese-zinc ferrite materials.It is a main development direction of preparation technology of manganese-zinc ferrite powder in the future.In this paper,Mn-Zn ferrite powder was prepared by high energy ball milling.The basic theory of preparing Mn-Zn ferrite powder was studied.Among them,the principle and method of high energy ball milling,the crystal structure of manganese-zinc ferrite,the magnetic properties of manganese-zinc ferrite,the crushing behavior of micro-powder of manganese-zinc ferrite prepared by double planetary ball milling machine,the factors affecting the properties of manganese-zinc ferrite and the efficiency of ball milling are included.The working principle,structure and kinematic analysis of the double planetary ball mill were studied,and it was used as the main experimental equipment for preparing Mn-Zn ferrite powder.Secondly,using the discrete element EDEM simulation,considering the parameters of rotating speed,medium filling rate and medium ball gradation,the comparative experiment was designed.The influence of rotating speed,medium filling rate,total shear power,energy utilization rate and energy loss power on the grinding effect of the double planetary ball mill for preparing Mn-Zn ferrite powder was analyzed and compared,and the grinding effect was obtained.The effect affects the best technological parameters.Finally,the feasibility of the simulation results of discrete element EDEM is verified by physical experiments.The experimental data are compared with the results of the discrete element EDEM simulation,which verifies the feasibility of the discrete element EDEM simulation results by analyzing the effects of the rotating speed of the ball mill on the particle size,viscosity,sedimentation stability and power of the Mn-Zn ferrite powder and the effect of the filling ratio of the medium on the particle size and power of the Mn-Zn ferrite powder.The effect of milling time on the properties of Mn-Zn ferrite powder was studied under the optimum parameters,and the optimum milling time was obtained.In conclusion,when the rotating speed is 140 r/min,the filling ratio of grinding medium is 0.4,the gradation of grinding medium is 2,3,4,8 mm and the grinding time is 45 h,the double planetary ball mill has the best grinding effect on Mn-Zn ferrite powder. |
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