The Research Of The Influence Of Process Parameters To The Structure And Properties On Ferrite Particles Prepared Via Ultrasonic Wave-assisted Ball Milling Technology

This paper mainly researched the role of ultrasound in the process of preparationof magnesium ferrite nanopowders by milling4MgCO₃·Mg（OH）₂·5H₂O,MgC₂O₄·2H₂O and C₄H₈MgO₄·4H₂O in aqueous solution. The grinding balls used inthis study are stainless steel. Comparing the results milling the raw materials with andwithout the ultrasound assisted in order to study the role of ultrasound in the processused in this paper. Comparing the results from the4MgCO₃·Mg（OH）₂·5H₂O andMgC₂O₄·2H₂O milled in aqueous solution under the different frequencies of theultrasonic assisted in order to determin the impact ultrasonic frequency to the process.To be sure the influence of the amount of water added in the process,differentamount deionized water was added to the MgC₂O₄·2H₂O，the different results candetermine the comparing the results with the water added optimum amount of water inthe process. The process ultrasonic-assisted aqueous ball milling technology used inthis paper is a simple process which is environment-friendly and the subsequentcalcination is not needed.This process has a good prospect in the application in theindustry.he main findings are as follows:（1）Milling the4MgCO₃·Mg（OH）₂·5H₂O and Fe₂O₃in aqueous solution underthe ultrasonic whose frequency is20KHz assisted，after40h the only generation is theMgFe₂O₄nano-particls.The average diameter of particle is about20nm and thesaturation magnetization is54.84emu/g.While for the ultrasonic frequency is40KHz,the time that the reaction completed is60h,and the saturation magnetization ofthe product is44.55emu/g.When milling the4MgCO₃·Mg（OH）₂·5H₂O and Fe₂O₃inthe aqueous solution without the ultrasound assisted for60h,the MgFe₂O₄didn’texit.Such phenomenon appeared in the process ultrasonic-assisted aqueous ballmilling when the balles are absence.（2） Flaky MgFe₂O₄particles were sucucesslly synthesized via ultrasonic-assistedaqueous ball milling technique after a certain time using MgC₂O₄·2H₂O and Fe₂O₃asraw material and small steel milling balls. In such process，when the ultrasonicfrequency is20KHz，the completion time of the reaction is15h and the saturationmagnetization of the final product is59.88emu/g; While the ultrasonic frequency are28KHz and40KHz,the completion time of the reaction are20h and the saturationmagnetization of the final product are respectively47.67emu/g and35.57emu/g. There is no MgFe₂O₄particles exit when milling the MgC₂O₄·2H₂O and Fe₂O₃powders in aqueous solution without the ultrasonic assisted for60h.In the processultrasonic-assisted aqueous ball milling with the ultrasonic frequency is20KHz, thelattice of the prodct obtained with the added deionized water is1000mL is smaller andits integrity is better than the case when the the added deionized water is2000mL.（3） Milling the C₄H₈MgO₄·4H₂O and Fe₂O₃in aqueous solution under theultrasonic assisted whose frequency is20KHz and the milling balles are stainlesssteel，there exited MgFe₂O₄powders after only10h.The XRD pattern only remainedonly magnesium ferrite diffraction peaks，no other diffraction peaks appeared whenthe process continued to40h.