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.
CN104091667AActive Publication Date: 2014-10-08ZHEJIANG UNIV +1
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Patent Information

Authority / Receiving Office
CN · China
Current Assignee / Owner
ZHEJIANG UNIV
Publication Date
2014-10-08

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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.
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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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