Injection molding preparation method for metal magnetic powder cores

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

Active Publication Date: 2014-10-08
ZHEJIANG UNIV +1
View PDF10 Cites 8 Cited by
  • 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, uni...

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Injection molding preparation method for metal magnetic powder cores
  • Injection molding preparation method for metal magnetic powder cores
  • Injection molding preparation method for metal magnetic powder cores

Examples

Experimental program
Comparison scheme
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...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

PUM

PropertyMeasurementUnit
Granularityaaaaaaaaaa
Login to view more

Abstract

The invention discloses an injection molding preparation method for metal magnetic powder cores. The preparation method comprises the following steps: 1) carrying out ball milling on metal soft magnetic alloy powder into powder of different particle sizes; 2) adding a passivator to carry out insulation coating after the powder is prepared according to a certain particle size; 3) after a binder is added and mixing granulation is carried out, carrying out injection molding on the powder to obtain magnetic powder core molding blank bodies; 4) after the magnetic powder core molding blank bodies are degreased and thermally degreased by a solvent, sintering to reach densification; 5) under the protection of inert gases, annealing magnetic powder cores and removing sintering stresses. The method disclosed by the invention is suitable for preparing small and medium-sized metal magnetic powder core components with complex shapes and high precision. The magnetic powder cores prepared by the method disclosed by the invention has the characteristics of uniform density, uniform internal organization, high mechanical strength, good direct current bias magnetic properties and relatively low power consumption.

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

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

Application Information

Patent Timeline
no application Login to view more
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
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Try Eureka
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap