Method for manufacturing dry-pressing formed sintered permanent ferrite

A permanent magnet ferrite, dry pressing forming technology, applied in the field of magnetic material manufacturing, can solve the problems of difficult automatic forming, product density reduction, complex forming molds, etc. Effect
CN101205137AInactive Publication Date: 2008-06-25HENGDIAN GRP DMEGC MAGNETICS CO LTD
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
HENGDIAN GRP DMEGC MAGNETICS CO LTD
Publication Date
2008-06-25
Estimated Expiration
Not applicable · inactive patent

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Abstract

The invention relates to a manufacturing method of sintering permanent magnetism ferrite by dry-pressing molding. The method comprises following working procedures: crushing process, the preparation process of dry pressing the magnetic powder, dry pressing process and sinter process. The organic dispersant added in the crushing process is one or a plurality among polyethylene glycol, calcium stearate and calcium gluconate, and the content of the organic dispersant is 0.1wtpercent-1.5wtpercent; the bond added in the he preparation process of dry pressing the magnetic powder is one or a plurality among PVA, polyethylene glycol, camphor and stearate, and the content of the bond is 0.1wtpercent-1.5wtpercent. 1. The manufacturing method of sintering permanent magnetism ferrite by dry-pressing molding of the invention has the advantages of that the productivity effect is high, the molding mould is simple and the automation molding is easy to be realized; the surface of the molded finished product is lubricous and even, the fettling is not needed, and the workload of the post processing is decreased greatly; 2. The manufacturing method of sintering permanent magnetism ferrite by dry-pressing molding of the invention adopts the unique preparation technique of dry pressing the magnetic powder, and the orientation in the process of magnetic field press is relatively good, and the high Br and high HCJ dry-pressing sintering permanent magnetism ferrite is easy to be gained; 3. The manufacturing method of sintering permanent magnetism ferrite by dry-pressing molding of the invention adopts the pre-sintering material with a better performance of ion substitutional main prescription, and a dry-pressing anisotropic sintering permanent magnetism ferrite with a better magnetism performance can be achieved.
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Description

technical field

[0001] The invention relates to a method for manufacturing sintered permanent magnet ferrite, in particular to a method for manufacturing sintered permanent magnet ferrite formed by dry pressing; it belongs to the field of manufacturing magnetic materials. Background technique

[0002] Sintered permanent magnet ferrite has stable magnetic properties and strong demagnetization resistance; it is not easy to rust and does not need to be coated with a protective layer; it is hard and brittle and can be used for special tool processing and cutting; and it is cheap and low in use. Therefore, it is widely used in automobiles, household appliances, industrial automation and other industries. The sintered permanent ferrite is made of hexagonal sintered ferrite magnets, especially the hexagonal magnetoplumbite ferrite is more widely used. The oxide permanent magnet ferrite material is mainly strontium ferrite (SrO·6Fe) with magnetoplumbite hexagonal structure. 2 o 3...

Claims

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