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A magnetic powder core and mica powder technology, applied in the field of magnetic powder cores, can solve the problems of low dielectric strength and compactness of magnetic powder cores, and achieve the effects of improving compactness, reducing eddy current loss, and improving quality
Inactive Publication Date: 2019-02-01
ZHONGDE ELECTRONICS
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Problems solved by technology
However, the existing magnetic powder cores have defects such as low dielectric strength and low compactness.
Method used
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Embodiment 1
[0017] A method for preparing a magnetic powder core, the method comprising the steps of:
[0018] S1. Dry the smelted alloy, crush it, and then carry out sieving and grading treatment, then add binder, passivator, insulating agent and coupling agent, stir, and add a release agent to obtain pretreated alloy powder; the insulating agent It is modified mica powder;
[0019] S2. The pretreated alloy powder is molded and heat-treated, and then cooled to room temperature and sprayed with paint to obtain a magnetic powder core.
Embodiment 2
[0021] A method for preparing a magnetic powder core, the method comprising the steps of:
[0022] S1. Dry the smelted alloy, crush it, and then carry out sieving and grading treatment, then add binder, passivator, insulating agent and coupling agent, stir, and add a release agent to obtain pretreated alloy powder; the insulating agent It is modified mica powder;
[0023] S2. The pretreated alloy powder is molded and heat-treated, and then cooled to room temperature and sprayed with paint to obtain a magnetic powder core.
Embodiment 3
[0025] A method for preparing a magnetic powder core, the method comprising the steps of:
[0026] S1. Dry the smelted alloy, crush it, and then carry out sieving and grading treatment, then add binder, passivator, insulating agent and coupling agent, stir, and add a release agent to obtain pretreated alloy powder; the insulating agent It is modified mica powder;
[0027] S2. Perform heat treatment after compression molding the pretreated alloy powder, and then spray paint after cooling to room temperature to obtain a magnetic powder core;
[0028] Among them, in S1, the preparation process of modified mica powder is as follows: mix mica powder with nylon fiber and diopside powder according to the mass ratio of 1:0.05:0.5, and mix on a mixer for 12 hours to obtain modified mica powder;
[0029] In S1, the drying time is 1.3h, and the drying temperature is 130°C;
[0030] In S1, in the operation of sieving and grading treatment, the particle size ratio is carried out accordin...
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Abstract
The invention relates to the technical field of magnetic powder cores, in particular to a magnetic powder core preparation method. The method comprises the following steps that S1, a smelted alloy isdried, crushed and then subjected to sieving and classification, then a binder, passivator, insulator and a coupling agent are added, stirring is conducted, a release agent is added, and preprocessedalloy powder is obtained, wherein the insulator is modified micapowder; S2, the preprocessed alloypowder is subjected to compression molding and heat treatment, then cooled to reach the room temperature and sprayed with paint, and a magnetic powder core is obtained. The obtained magnetic powder core has the high dielectric strength and compactness.
Description
technical field [0001] The invention relates to the technical field of magnetic powder cores, in particular to a preparation method of magnetic powder cores. Background technique [0002] Magnetic powder core is a kind of soft magnetic material formed by mixing and pressing ferromagnetic powder particles and insulating medium. Since the ferromagnetic particles are very small (0.5-5um used at high frequencies) and are separated by non-magnetic electrical insulating film substances, on the one hand, the eddy current can be isolated, and the material is suitable for higher frequencies; The gap effect between the materials leads to low magnetic permeability and constant magnetic permeability characteristics; and because of the small particle size, the skin phenomenon basically does not occur, and the change of magnetic permeability with frequency is relatively stable. Mainly used for high frequency inductors. The magnetic and electrical properties of the powder core mainly dep...
Claims
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Application Information
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