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A two-fluid granulation method of soft magnetic composite powder for molding inductors

A technology of soft magnetic composite and soft magnetic powder, which is applied in the manufacture of inductors/transformers/magnets, circuits, electrical components, etc. It can solve problems such as no fluidity, adhesion to device walls, flying dust, etc., and achieve high inductance and high Effects of stability, improved moldability, and good fluidity

Inactive Publication Date: 2018-12-28
安徽博微新磁科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] The molded inductor includes a base body and a winding body. The base body system is formed by die-casting the winding body embedded in metal magnetic powder. Commonly used magnetic powders include carbonyl iron powder and iron silicon chromium powder. The particle size of the powder is about 10um. The fine powder is easy to agglomerate and stack during storage, and the problem of dust flying and sticking to the wall of the device is easy to occur during the process of pressing the molded inductor. In addition, because the powder is dry and has no fluidity, quantitative feeding production cannot be carried out; On the other hand, during the use of molded inductance devices, as the frequency of use increases, the loss also increases significantly. The most important loss is eddy current loss. Eddy current loss not only reduces the performance of the device, but also generates a lot of Joule heat In order to reduce the energy loss caused by eddy current loss, the usual method is to coat the magnetic particles with a layer of organic or inorganic insulating material with high resistivity to increase their resistance and reduce conductivity, which requires the use of adhesives. Granulation treatment, and the general granulation method is extrusion granulation, such as a preparation method of permanent ferrite nylon masterbatch for compatibilization with application number 201610363900, a high-performance nanocrystalline soft magnetic material with application number 201210003641 Composite materials and their preparation methods all use this method for granulation, but extrusion granulation tends to appear in long strips, which seriously affects the production efficiency and product quality of molded inductors

Method used

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  • A two-fluid granulation method of soft magnetic composite powder for molding inductors
  • A two-fluid granulation method of soft magnetic composite powder for molding inductors
  • A two-fluid granulation method of soft magnetic composite powder for molding inductors

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Embodiment 1

[0025] The two-fluid granulation method of the soft magnetic composite powder for molded inductors of the present embodiment comprises the following steps:

[0026] (1) Add iron-silicon-chromium alloy powder (FeCrSi-C) into acetone in which phosphoric acid (analytically pure) has been dissolved, and place it in a double planetary mixer and stir for 40 minutes. At the same time, the system is heated and ventilated, and the heating temperature is 45°C , then take out the powder, the quality of phosphoric acid and acetone are respectively 0.5%, 12% of the FeSiCr alloy powder quality in this step;

[0027] (2) Take soft magnetic powder molding glue, epoxy resin and phenolic resin respectively, and dissolve in acetone to form adhesive;

[0028] (3) Mix the pretreated iron-silicon-chromium alloy powder with the adhesive, and place it in a double planetary mixer to fully stir to form a two-fluid granulation puree. The mixer speed is set to 40 rpm, and the mixing time is 15-30min. Th...

Embodiment 2

[0041]The two-fluid granulation method of the soft magnetic composite powder for molded inductors of the present embodiment comprises the following steps:

[0042] (1) Add carbonyl iron powder into acetone dissolved with phosphoric acid (analytically pure), and place it in a double planetary mixer to stir for 40 minutes. At the same time, the system is heated and ventilated. The heating temperature is 45°C, and then the powder is taken out. This step The mass of phosphoric acid and acetone are respectively 0.5% and 12% of the carbonyl iron powder mass;

[0043] (2) Take soft magnetic powder molding glue, epoxy resin and phenolic resin respectively, and dissolve in acetone to form adhesive;

[0044] (3) Mix the pretreated carbonyl iron powder with the adhesive, and place it in a double planetary mixer to fully stir to form a two-fluid granulation puree. The mixer speed is set to 40 rpm, and the mixing time is 15-30min. The precipitated emulsion is the two-fluid granulation pur...

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Abstract

The invention discloses a two-fluid granulation method of soft magnetic composite powder for molding inductors, belonging to the technical field of metal soft magnetic powder material preparation. Themethod comprises the following steps in particular: (1) pretreatment of soft magnetic metal powder; (2) preparation of adhesive; (3) fully stirring and mixing the pretreated soft magnetic metal powder and the adhesive to obtain two-fluid granulating slurry; (4) spray granulation of the original granulation slurry. The soft magnetic powder prepared by the method of the invention has high sphericity, low moisture content, good bulk density and fluidity, and improves product performance and production efficiency.

Description

technical field [0001] The invention belongs to the technical field of functional materials and powder metallurgy, and in particular relates to a granulation method of soft magnetic composite powder for molded inductors. Background technique [0002] The molded inductor includes a base body and a winding body. The base body system is formed by die-casting the winding body embedded in metal magnetic powder. Commonly used magnetic powders include carbonyl iron powder and iron silicon chromium powder. The particle size of the powder is about 10um. The fine powder is easy to agglomerate and stack during storage, and the problem of dust flying and sticking to the wall of the device is easy to occur during the process of pressing the molded inductor. In addition, because the powder is dry and has no fluidity, quantitative feeding production cannot be carried out; On the other hand, during the use of molded inductance devices, as the frequency of use increases, the loss also increa...

Claims

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Application Information

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IPC IPC(8): H01F1/26H01F41/02B22F1/00
CPCH01F1/26H01F41/0246B22F1/103B22F1/107
Inventor 李伟健李媛媛万静龙刘国安柳军涛
Owner 安徽博微新磁科技有限公司
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