Process for producing oxide magnetic material based permanent magnet

A technology of magnetic materials and permanent magnets, applied in the direction of magnetic materials, inductance/transformer/magnet manufacturing, magnetic objects, etc., can solve the problem of increasing the amount of forming aids

Active Publication Date: 2006-04-05
TDK CORPARATION
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0012] However, in order to reduce the die pressure between the molded product and the mold and ensure good formability, the amount of forming aids has to be increased to a certain extent. This is the current situation.

Method used

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Embodiment Construction

[0019] Best way to implement the invention

[0020] The method for producing the oxide magnetic material-based permanent magnet of the present invention will be described in detail below.

[0021] The method for producing an oxide magnetic material-based permanent magnet according to the present invention includes, as a main process, a binder adding step of adding and mixing a binder to a raw material powder containing an oxide magnetic material, adding the raw material powder containing the above-mentioned raw material powder and a binder The water content adjustment step of adding the water content of the water content adjustment mixture to the molding mixture of the agent, putting the above-mentioned molding mixture with the water content adjustment into a mold, pressurizing it in an external magnetic field, and aligning the easy magnetization direction of the oxide magnetic material powder A dry forming process, and a sintering process of sintering the molded body.

[002...

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Abstract

A process for producing an oxide magnetic material based permanent magnet, comprising a binder addition step of adding a binder and a molding auxiliary to raw material powder containing an oxide magnetic material and mixing the same; a moisture regulation step of regulating the moisture of the resultant molding mixture containing the raw material powder, binder and molding auxiliary; an in-magnetic-field dry molding step of charging the molding mixture after moisture regulation into a metal mold and pressing the mold in an applied magnetic field so as to align the easy magnetization directions of the oxide magnetic material powder; and a firing step of firing the thus molded item, wherein the binder added in the binder addition step is a fatty acid ester wax, while the molding auxiliary added in the binder addition step is a stearic acid salt having such a property that it is melted at 90 DEG C or below in relation to the fatty acid ester wax as the binder (90 DEG C melting characteristic). By this process, at low cost, there can be obtained an oxide magnetic material based permanent magnet of enhanced alignment and sintered body density excelling in magnetic characteristics.

Description

technical field [0001] The present invention relates to a method for manufacturing an oxide magnetic material-based permanent magnet, and more particularly to a method for manufacturing an oxide magnetic material-based permanent magnet formed by a so-called dry forming method. Background technique [0002] Anisotropic oxide permanent magnets of magnetoplumbite such as Sr ferrite and Ba ferrite are formed by sintering after forming in a magnetic field. Forming in a magnetic field is roughly classified into a dry forming method and a wet forming method according to the method. In the wet forming method, since the particles of the permanent magnet material are easy to rotate, the orientation of the magnetic material becomes good, and good magnetic properties can be obtained. However, since the dispersion medium needs to be discharged out of the molding space (outside of the mold cavity) during press molding, productivity deteriorates. Furthermore, the structure of the mold be...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01F1/11C04B35/26H01F1/113H01F41/02
CPCH01F41/0273C04B35/2683H01F1/11
Inventor 坪仓多惠子铃木常雄村濑琢
Owner TDK CORPARATION
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