Method of fabricating rare-earth sintered magnet and method of fabricating rare-earth bonded magnet

A technology of sintered magnets and bonded magnets, which is applied to magnetic objects, magnetic materials, transportation and packaging, etc., can solve the problems of non-mass production, and achieve the prevention of evaporation, oxidation and excessive nitriding suppression, and excellent magnetic properties Effect

Inactive Publication Date: 2009-06-03
SEIKO INSTR INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In particular, the current situation is that rare earth-transition metal-nitride based sintered magnets have not yet been mass-produced

Method used

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  • Method of fabricating rare-earth sintered magnet and method of fabricating rare-earth bonded magnet

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0027] figure 1 is a schematic perspective view of an apparatus for implementing a method of manufacturing a magnet according to an embodiment of the present invention. The device includes a microwave generating tube 1 for generating microwaves. The tube 1 is connected to an applicator 3 via a waveguide 2 . The microwave emitted by the microwave generating tube 1 is transmitted to the applicator 3 through the waveguide 2 . An isolator 4 is installed in the waveguide 2 . The isolator 4 transmits the microwaves in the waveguide 2 only towards the applicator 3 and absorbs the microwaves transmitted in the opposite direction.

[0028] Sample 5 was placed in applicator 3 and irradiated with microwaves. The applicator 3 is a closed metal container, and is designed to prevent leakage of microwaves to the outside. A gas supply source 6 for introducing an inert gas such as nitrogen is connected to the applicator 3 . In addition, a pump 7 for evacuating the inner atmosphere is con...

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Abstract

The invention relates to a method of fabricating rare-earth sintered magnet and method of fabricating rare-earth bonded magnet. Concretely a method of fabricating a rare-earth based sintered magnet having improved magnetic and mechanical characteristics is offered. Also, a method of fabricating a rare-earth bonded magnet having improved magnetic and mechanical characteristics is offered. The method of fabricating the rare-earth based sintered magnet is started with preparing powder of an alloy including a rare-earth element and a transition metal. The powder of the alloy is mixed with an additive. The mixture is compression molded and irradiated with microwaves to cause the powder to self-heat. As a result, the mixture is sintered.

Description

technical field [0001] The invention relates to a method for preparing a rare earth sintered magnet and a method for preparing a rare earth bonded magnet. Background technique [0002] The preparation of magnets mainly composed of rare earth elements relies on the general sintering method. This sintering method involves several processing steps including melting of the alloy, heat treatment, pulverization, compression molding, (if necessary) nitriding, sintering, heat treatment, machining and magnetization. [0003] A bonded magnet that can be molded with a large degree of freedom at low cost is produced by subjecting the magnet to a treatment step up to heat treatment using sintering, pulverizing the heat-treated magnet, and combining the pulverized magnet with a resin ( such as epoxy or nylon) are mixed and the mixture is compression molded or injection molded. This compression molding or injection molding step results in greater freedom in molding the compound at low co...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01F41/02H01F1/053H01F1/08B22F3/12
CPCB22F2003/248B22F3/105H01F41/0266C22C1/0491H01F1/0577H01F1/0557B22F2003/1054H01F1/0558B22F2998/10B22F2999/00B22F3/1007H01F1/0578C22C2202/02C22C1/047B22F2201/02B22F1/10B22F3/24B22F3/225B22F3/02B22F9/04
Inventor 中村芳文
Owner SEIKO INSTR INC
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