磁場處理對非晶磁粉芯性能的影響
[Abstract]:The disordered dense stacked atomic structure of amorphous soft magnetic alloys is different from that of conventional crystalline metal materials, which makes them possess excellent soft magnetic properties such as high permeability, high magnetic saturation strength, low coercivity and low loss. With the development of electronic industry towards miniaturization, lightweight, high efficiency and high frequency, the advantages of Fe-based amorphous alloy strip are no longer obvious, but the amorphous powder prepared from amorphous alloy can meet the demand of high-frequency. At present, the properties of amorphous powder cores are poor and unstable due to their irregular shape, so it is very important to improve the performance of existing amorphous powder cores both in theory guidance and industrial application. Magnetic field heat treatment is a simple method to improve the structure and properties of materials. There have been many reports about the effect of magnetic field heat treatment on amorphous bands, but there are few reports on the effect of magnetic powder core. In order to solve the existing problem of amorphous magnetic powder core, the most common Fe78Si9B13 amorphous alloy is used as the research object in this paper, the magnetic field heat treatment of amorphous magnetic powder and magnetic powder core is carried out. The effects of different heat treatment processes on soft magnetic properties and magnetic domain structure are systematically studied. The effect of magnetic field heat treatment on amorphous magnetic powder cores is further improved, which provides theoretical and experimental guidance for the engineering application of amorphous magnetic powder core materials. The main contents of this thesis are as follows: (1) there is a large internal stress in the process of rapid quenching and ball milling of amorphous magnetic powder. The magnetic field preheating, vacuum preheating and non-treatment are carried out, and then the three amorphous magnetic powders are passivated. Insulation coating, addition of adhesive, and the amorphous magnetic powder in the same cold pressing process. The changes of magnetic induction intensity (Bs), permeability (渭), loss (P _ (cv) and DC bias properties were studied, and the magnetic domains of pretreated magnetic powders were observed by magnetic force microscope (MFM). At the same time, the effects of passivation and preheat treatment on the properties of magnetic powder and magnetic powder core were studied. (2) the effect of high transverse magnetic field heat treatment on the properties of amorphous magnetic powder core was studied. The morphology of magnetic powder was observed by scanning electron microscope (SEM) (SEM). The effect of annealing temperature on the structure and soft magnetic properties when the magnetic field intensity is constant. And the effect of magnetic field heat treatment on the crystal structure and soft magnetic properties of magnetic powder core with different particle size distribution. (3) the effect of longitudinal weak magnetic field heat treatment on the performance of amorphous magnetic powder core was studied. The effects of annealing temperature on the crystal structure, complex permeability, quality factor and loss factor, frequency relaxation and DC bias properties were investigated. Due to the large demagnetization in the magnetic field heat treatment process, the magnetic field heat treatment effect of the spherical magnetic powder core with small demagnetization field is also studied. With the increase of magnetic field, the soft magnetic performance of magnetic powder core is improved continuously, and the best magnetic performance is moving to high frequency.
【學位授予單位】:鄭州大學
【學位級別】:碩士
【學位授予年份】:2017
【分類號】:TG132.27
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