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High-permeability amorphous compressed powder core by means of high-temperature molding, and method for preparing same

A technology of high magnetic permeability and dust core, which is applied in the manufacture of inductors/transformers/magnets, magnetic cores/yokes, magnetic materials, etc. It can solve the problems of continuous production, mass production, excessive molding time, etc. problems, to achieve the effect of no surface cracking, good insulation between particles, and high molding density

Inactive Publication Date: 2015-09-02
裵恩英
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

As the experimental molding method applied at this time, there is hot isotropic pressing (Hot Isotropic Pressing), in addition, there are explosive method, impact gun method, etc., but these methods require special equipment for obtaining very high energy, especially in the presence of Too much molding time is required, and continuous production cannot be performed, nor can it be mass-produced

Method used

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  • High-permeability amorphous compressed powder core by means of high-temperature molding, and method for preparing same

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] Example 1, which is the best form for the implementation of the present invention, is made according to the high-pressure water jet method, and is expected to realize nanocrystallization by moderate heat treatment, Fe as an alloy powder in an amorphous state. 73.5 Si 13.5 B 9 Nb 3 Cu 1 (Average particle size about 15μm) 1000g, phosphoric acid (H 3 PO 4 ) 10g was diluted in acetone, and the phosphoric acid coating treatment was performed for the first time. After drying, the solution prepared by dissolving 10g of polyimide in methylene chloride solution was used for the second coating treatment. , carry out drying treatment, and manufacture polyimide. On the surface of amorphous alloy powder with an average particle size of about 15 μm, evenly coat composite particle powder with a thickness of about 1 μm or less. After drying, uniformly mix molybdenum disulfide with an average particle size of 3 μm (MoS 2 ) powder 10g.

[0035] Put the composite particle powder mi...

Embodiment 2

[0041] Example 2 for carrying out the present invention was carried out in the same manner as in Example 1 except that phosphoric acid coating treatment was performed using 25 g of phosphoric acid. Table 1 shows various properties of the nanocrystallized amorphous powder magnetic core thus produced.

Embodiment 3

[0043] Example 3 used for implementation of this invention carried out similarly to Example 1 except having melt|dissolved 20 g of polyimides in methylene chloride and prepared the solution. Table 1 shows various properties of the nanocrystallized amorphous powder magnetic core thus produced.

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Abstract

In the present invention, according to a method for preparing a high-permeability amorphous compressed powder core by means of high-temperature molding, wherein the variable range of effective permeability is small even at a high frequency band, it is possible to prepare an amorphous compressed powder core having a small variable range of effective permeability even at a high frequency band, an effective permeability of 75 or more, and a significantly small core loss of 300 mW / cc or less under conditions in which the frequency is 50 KHz and the induced magnetic flux is 1,000 Gauss, by coating twice, i.e. with phosphoric acid coating and polyimide-based coating as insulators between powders, and then automatic compression molding at a temperature of about 200-550̊C by using molybdenum disulphide (MoS2) or graphite powder which can be lubricated at a high temperature. Also, the present invention provides a high-permeability amorphous compressed powder core by means of economical high-temperature molding, wherein the high-permeability amorphous compressed powder core obtained by means of automatic molding at a high temperature has high molding density and no surface cracks, has good insulation properties amongst particles so as to be less dependent on frequency, and also has a small variable range of effective permeability even at a high frequency band. Therefore, the high-permeability amorphous compressed powder core can be used as a magnetic material for electric and electronic devices that are operated at a frequency band of several KHz to several tens of MHz.

Description

technical field [0001] The invention relates to a high-permeability amorphous powder magnetic core based on high-temperature molding and its manufacturing method. At a high temperature of 200-550°C, which is impossible in the prior art, by means of automatic molding, it can be used at a temperature of several KHz to It is applied in the tens of MHz frequency band, and the effective magnetic permeability is above 75. Background technique [0002] In general, soft magnetic amorphous alloys are superior in magnetic permeability and iron loss compared to crystalline materials, and are being used as magnetic materials for various devices in electrical and electronic equipment. In industrial applications, they are used in transformers, Inductors, motors, generators, relays, etc. [0003] In addition, in general, soft magnetic amorphous alloy powder can be produced by mechanical alloying method, quench solidification method, water jet method, etc., but in the present invention, hi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22F3/02B22F3/24H01F41/02B22F1/08B22F1/102B22F1/105B22F1/16
CPCB22F1/007H01F3/08B22F1/0062C22C45/02B22F9/002B22F2003/023B22F3/02H01F1/153H01F41/0246B22F2003/145C22C2202/02C22C1/002C22C33/003B22F1/102B22F1/105B22F1/16B22F1/08B22F3/24H01F41/02H01F1/15308B22F3/14H01F1/1535H01F1/15383H01F1/15316H01F1/24B22F2003/248
Inventor 金圭镇
Owner 裵恩英
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