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A kind of injection molding preparation method of metal magnetic powder core

A technology of injection molding and magnetic powder core, applied in the direction of magnetic materials, magnetic objects, inorganic materials, etc., can solve the problems of complex shapes and difficult mass production, and achieve the effects of uniform density, high mechanical strength and low power consumption

Active Publication Date: 2016-09-14
ZHEJIANG UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to solve the problems of traditional dry pressing that it is difficult to mass-produce metal magnetic powder cores with thin walls, complex shapes, high precision, uniform density and structure, and at the same time obtain metal magnetic powder cores with good DC bias performance and low power consumption. Provide a method for preparing metal magnetic powder core by injection molding

Method used

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  • A kind of injection molding preparation method of metal magnetic powder core
  • A kind of injection molding preparation method of metal magnetic powder core
  • A kind of injection molding preparation method of metal magnetic powder core

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Experimental program
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Effect test

Embodiment 1

[0016] The selection and consumption of metal soft magnetic alloy powder and binding agent in the present embodiment are as shown in Table 1 (all by weight percentage):

[0017] Table 1

[0018]

[0019] The specific preparation methods include:

[0020] (1) Select carbonyl iron powder as metal soft magnetic powder, and ball mill it into powder particles with a particle size of less than 75 μm, wherein the powder particle size is 40 μm to 75 μm and accounts for 40 wt% of the total amount, and the powder particle size is less than 40 μm accounts for 60 wt% of the total amount;

[0021] (2) Add 0.4wt% phosphoric acid to the soft magnetic alloy powder prepared in step (1), use absolute ethanol as the phosphoric acid dispersant, mix well, and keep warm at 80°C for 2 hours;

[0022] (3) uniformly mix the passivated soft magnetic powder and binder in step 2, knead at 100°C for 3 hours to obtain a mixture, and crush the mixture to particles with an average particle diameter of 8 ...

Embodiment 2

[0028] The selection and consumption of metal soft magnetic alloy powder and binding agent in the present embodiment are as shown in Table 2 (all by weight percentage):

[0029] Table 2

[0030]

[0031] The specific preparation methods include:

[0032] (1) Ball milling the metal powder into powder particles with a particle size of less than 75 μm, wherein 40 μm to 75 μm accounts for 50 wt% of the total amount, and those less than 40 μm account for 50 wt% of the total amount;

[0033] (2) Add 0.8wt% phosphoric acid to the soft magnetic alloy powder prepared in step (1), use acetone as the phosphoric acid dispersant, mix well, and keep warm at 100°C for 1 hour;

[0034] (3) uniformly mix the passivated soft magnetic powder and the binder in step 2, knead at 120° C. for 2 hours to obtain a mixture, and crush the mixture to particles with an average particle diameter of 8 mm;

[0035] (4) Heating the pulverized mixture in step 3 to 120° C., injecting it into the mold cavity...

Embodiment 3

[0040] The selection and consumption of metal soft magnetic alloy powder and binding agent in the present embodiment are as shown in Table 3 (all by weight percentage):

[0041] table 3

[0042]

[0043] The specific preparation methods include:

[0044] (1) Ball milling into powder particles with a particle size of less than 75 μm, wherein 40 μm to 75 μm accounts for 60 wt% of the total amount, and those less than 40 μm account for 40 wt% of the total amount;

[0045] (2) Add 1.0wt% chromic acid to the soft magnetic alloy powder in the ratio of step (1), use absolute ethanol as the chromic acid dispersant, mix well, and keep warm at 100° C. for 1 hour;

[0046] (3) uniformly mix the passivated soft magnetic powder and binder in step 2, knead at 140° C. for 2 hours to obtain a mixture, and crush the mixture to particles with an average particle diameter of 8 mm;

[0047] (4) Heating the pulverized mixture in step 3 to 140° C., injecting it into the mold cavity under a pre...

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Abstract

The invention discloses an injection molding preparation method of a metal magnetic powder core, which comprises the following steps: 1) ball milling the metal soft magnetic alloy powder into powders with different particle sizes; Carry out insulation coating; 3) After adding the binder, after mixing and granulating, inject the powder to obtain the magnetic powder core molding body; 4) After the magnetic powder core body is degreased by solvent and thermal degreasing, it is sintered to achieve compactness 5) Under the protection of inert gas, anneal the magnetic powder core to remove the sintering stress. The method of the invention is suitable for preparing small and medium-sized metal magnetic powder core elements with complex shapes and high precision. The magnetic powder core prepared by the method of the invention has the characteristics of uniform density, uniform internal structure, high mechanical strength, good DC bias magnetic performance and relatively low power consumption. features.

Description

technical field [0001] The invention belongs to the technical field of magnetic device preparation, and in particular relates to an injection molding preparation method of a metal magnetic powder core. Background technique [0002] At present, the forming method of metal magnetic powder cores is mainly dry pressing. This method has the advantages of high production efficiency, easy automation, and not easy to deform. Low, the internal density of the magnetic powder core after compression molding is not uniform, the structure uniformity is poor, and it is easy to crack. Powder injection molding uses molds to inject molded blanks and quickly manufacture structural parts with high density, high precision, and three-dimensional complex shapes through sintering, and can be directly mass-produced. This process technology not only has the advantages of no need for cutting and high economic benefits after one-time molding, but also overcomes the shortcomings of dry pressing molding...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01F1/147H01F1/22B22F3/16
Inventor 严密陈海平吴琛张念伟王新华樊波张彪
Owner ZHEJIANG UNIV
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