机械法制备锰锌铁氧体磁流体的研究
发布时间:2019-02-12 21:45
【摘要】:MnZn铁氧体纳米磁性材料作为一种多功能材料,广泛应用于远程通讯设备和各种开关电源转换器设备中,在高频弱电领域中,已经成为很有发展前途的一种磁性材料。因其具有高的初始磁导率和较高的饱和磁感应强度,较低的矫顽力等优点,它的制备技术受到科研人员的极大关注。现今,纳米磁性材料的制备方法主要包括高能球磨法、化学沉淀法、热分解法等。其中,高能球磨法具有配方准确、工艺简单以及易于大规模工艺生产的优点。本文研究了机械法制备锰锌铁氧体的工艺过程对其磁性能的影响,实验中主要运用的是高能球磨法,高能球磨法的工作原理是通过研磨介质与物料的剪切和碰撞,达到对物料磨碎、磨细的效果。物料的研磨效果与许多因素息息相关,其中包括研磨速度、介质配比、研磨时间等。本文利用控制变量法首先研究了在制备锰锌铁氧体原料的各个工艺过程的最佳参数,选择最佳参数下制备出的锰锌铁氧体,运用高能球磨法,制备锰锌铁氧体磁流体,并确定最佳转速、研磨时间以及最佳的研磨介质配比。最终得到高能球磨法制备锰锌铁氧体磁流体的最佳工艺参数。本文通过实验研究,得出了以下结论:(1)结合锰锌铁氧体原料组分与初始磁导率之间的关系图,以及锰锌铁氧体的磁性理论,通过实验研究得出,其他工艺过程相同的情况下,以制得的锰锌铁氧体初始磁导率为依据,确定最佳原料主配方。(2)适量的掺杂能够提高锰锌铁氧体的磁性能。本文研究了 SiO2、Bi2O3、Nb2O5单一掺杂与复杂掺杂对锰锌铁氧体磁性能的影响,得出的结论是,在工艺实验范围内,影响MnZn铁氧体初始磁导率的最大因素,从大到小排序为SiO2、Bi2O3、Nb2O5,并确定其最佳掺杂配方。(3)二次球磨时间的延长,可有效减小粉料的粒径。本文通过研究二次球磨时间对样品密度、粉料粒径以及样品形貌特征等的影响,得出最佳二次球磨时间。(4)通过控制变量法,综合对比不同工艺条件下样品粒度、粘度、饱和磁化强度,最终确定分散剂种类、研磨介质规格、转速与球磨时间。用机械法制备出的锰锌铁氧体磁流体,样品结构均匀细致,稳定性优异,饱和磁化强度高,可验证机械法制备锰锌铁氧体磁流体不仅可行,且行之有效。
[Abstract]:As a multifunctional material, MnZn ferrite nanomagnetic material has been widely used in remote communication equipment and various switching power converter devices. It has become a promising magnetic material in the field of high frequency and weak current. Because of its high initial permeability, high saturation magnetic induction intensity and low coercivity, its preparation technology has attracted great attention of researchers. Nowadays, the preparation methods of nanomagnetic materials include high energy ball milling, chemical precipitation, thermal decomposition and so on. Among them, high energy ball milling has the advantages of accurate formula, simple process and easy to be produced in large scale. In this paper, the effect of mechanical process on the magnetic properties of Mn-Zn ferrite is studied. The high energy ball milling method is mainly used in the experiment. The working principle of the high energy ball milling method is the shear and collision between the grinding medium and the material. To achieve the material grinding, grinding effect. The grinding effect of materials is closely related to many factors, including grinding speed, medium ratio, grinding time and so on. In this paper, the control variable method is used to study the optimum parameters of the process of preparing manganese zinc ferrite. The Mn-Zn ferrite magnetic fluid is prepared by high-energy ball milling method. And determine the best speed, grinding time and the best ratio of grinding media. Finally, the optimum process parameters for the preparation of Mn-Zn ferrite magnetofluids by high energy ball milling were obtained. In this paper, the following conclusions are obtained through experimental research: (1) combining with the relationship diagram between the raw material composition and initial permeability of MnZn ferrite and the magnetic theory of Mn-Zn ferrite, the experimental results are obtained. According to the initial permeability of the prepared MnZn ferrite, the optimum raw material main formula is determined under the same process. (2) the magnetic properties of MnZn ferrite can be improved by proper doping. In this paper, the influence of SiO2,Bi2O3,Nb2O5 single doping and complex doping on the magnetic properties of Mn-Zn ferrite is studied. It is concluded that, in the range of technological experiment, the biggest factor affecting the initial permeability of MnZn ferrite is SiO2,Bi2O3, from large to small. (3) prolonging the secondary milling time can effectively reduce the particle size of the powder. In this paper, the effects of secondary ball milling time on the density, particle size and morphology of the samples were studied, and the optimum secondary milling time was obtained. (4) the particle size and viscosity of the samples under different technological conditions were compared synthetically by controlling variable method. Saturation magnetization, final determination of dispersant type, grinding medium specifications, speed and ball milling time. The Mn-Zn ferrite magnetic fluid prepared by mechanical method has the advantages of uniform structure, excellent stability and high saturation magnetization. It can be verified that the preparation of Mn-Zn ferrite magnetic fluid by mechanical method is not only feasible, but also effective.
【学位授予单位】:昆明理工大学
【学位级别】:硕士
【学位授予年份】:2017
【分类号】:TM277
本文编号:2420822
[Abstract]:As a multifunctional material, MnZn ferrite nanomagnetic material has been widely used in remote communication equipment and various switching power converter devices. It has become a promising magnetic material in the field of high frequency and weak current. Because of its high initial permeability, high saturation magnetic induction intensity and low coercivity, its preparation technology has attracted great attention of researchers. Nowadays, the preparation methods of nanomagnetic materials include high energy ball milling, chemical precipitation, thermal decomposition and so on. Among them, high energy ball milling has the advantages of accurate formula, simple process and easy to be produced in large scale. In this paper, the effect of mechanical process on the magnetic properties of Mn-Zn ferrite is studied. The high energy ball milling method is mainly used in the experiment. The working principle of the high energy ball milling method is the shear and collision between the grinding medium and the material. To achieve the material grinding, grinding effect. The grinding effect of materials is closely related to many factors, including grinding speed, medium ratio, grinding time and so on. In this paper, the control variable method is used to study the optimum parameters of the process of preparing manganese zinc ferrite. The Mn-Zn ferrite magnetic fluid is prepared by high-energy ball milling method. And determine the best speed, grinding time and the best ratio of grinding media. Finally, the optimum process parameters for the preparation of Mn-Zn ferrite magnetofluids by high energy ball milling were obtained. In this paper, the following conclusions are obtained through experimental research: (1) combining with the relationship diagram between the raw material composition and initial permeability of MnZn ferrite and the magnetic theory of Mn-Zn ferrite, the experimental results are obtained. According to the initial permeability of the prepared MnZn ferrite, the optimum raw material main formula is determined under the same process. (2) the magnetic properties of MnZn ferrite can be improved by proper doping. In this paper, the influence of SiO2,Bi2O3,Nb2O5 single doping and complex doping on the magnetic properties of Mn-Zn ferrite is studied. It is concluded that, in the range of technological experiment, the biggest factor affecting the initial permeability of MnZn ferrite is SiO2,Bi2O3, from large to small. (3) prolonging the secondary milling time can effectively reduce the particle size of the powder. In this paper, the effects of secondary ball milling time on the density, particle size and morphology of the samples were studied, and the optimum secondary milling time was obtained. (4) the particle size and viscosity of the samples under different technological conditions were compared synthetically by controlling variable method. Saturation magnetization, final determination of dispersant type, grinding medium specifications, speed and ball milling time. The Mn-Zn ferrite magnetic fluid prepared by mechanical method has the advantages of uniform structure, excellent stability and high saturation magnetization. It can be verified that the preparation of Mn-Zn ferrite magnetic fluid by mechanical method is not only feasible, but also effective.
【学位授予单位】:昆明理工大学
【学位级别】:硕士
【学位授予年份】:2017
【分类号】:TM277
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