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

a rare earth sintered magnet and bonding technology, applied in the field of rare earth sintered magnet and method of fabricating rare earth bonding magnet, can solve the problems of insufficient magnetic characteristics, inability to use the compound in bulk form, and produced temperature difference between, so as to achieve excellent magnetic characteristics.

Inactive Publication Date: 2009-03-26
SEIKO INSTR INC
View PDF6 Cites 6 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

[0027]According to the invention, a rare-earth bonded magnet is fabricated, using powder of a rare-earth magnet and a resi

Problems solved by technology

However, with the large furnace, a temperature difference is produced between a location close to the heat-generating portion of the heater and a location at a large distance from the heat-generating portion.
On the other hand, a compound such as rare earth-transition metal-nitride based material used as a magnetic material decomposes into nitrides of the rare-earth material and α-Fe at high temperatures exceeding 650° C. and thus sufficient magnetic characteristics are not obtained.
Therefore, it has been impossible to use the compound in bulk form.
However, in the method of arranging the coils around the sintering furnace and performing thermal treatment by RF induction hea

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

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0029]FIG. 1 is a schematic perspective view of equipment for implementing a method of fabricating a magnet in accordance with one embodiment of the present invention. The equipment includes a microwave-generating tube 1 producing microwaves. The tube 1 is connected with an applicator 3 via a waveguide 2. The microwaves generated by the microwave-generating tube 1 are transmitted to the applicator 3 through the waveguide 2. An isolator 4 is mounted in the waveguide 2. The isolator 4 transmits the microwaves in the waveguide 2 only toward the applicator 3, and absorbs microwaves transmitted in the reverse direction.

[0030]A sample 5 is placed within the applicator 3 and irradiated with the microwaves. The applicator 3 is a closed metal container and designed to prevent leakage of the microwaves to the outside. A gas supply source 6 for introducing an inert gas such as nitrogen is connected with the applicator 3. Furthermore, a pump 7 for venting the internal ambient is connected with ...

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
Pressureaaaaaaaaaa
Frequencyaaaaaaaaaa
Frequencyaaaaaaaaaa
Login to view more

Abstract

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

BACKGROUND OF THE INVENTION[0001]1. Field of the Invention[0002]The present invention relates to a method of fabricating a rare-earth sintered magnet and to a method of fabricating a rare-earth bonded magnet.[0003]2. Description of the Related Art[0004]Fabrication of a magnet consisting chiefly of a rare-earth element relies on a general method of sintering. This sintering method includes various processing steps including dissolution of an alloy, thermal treatment, pulverization, press molding, nitriding (if necessary), sintering, thermal treatment, machining, and magnetization.[0005]A bonded magnet that can be molded with great latitude at low cost is fabricated by subjecting a magnet to process steps up to thermal processing using sintering, pulverizing the thermally processed magnet, mixing the pulverized magnet with a resin (such as epoxy resin or nylon), and compression molding or injection molding the mixture. The compression molding or injection molding step yields great lat...

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): B22F3/105B22F3/24B22F3/02
CPCB22F3/1007B22F3/105H01F41/0266H01F1/0578H01F1/0577H01F1/0558H01F1/0557C22C2202/02C22C1/0491B22F2999/00B22F2998/10B22F2003/248B22F2003/1054B22F9/04B22F1/0059B22F3/02B22F3/225B22F3/24B22F2201/02C22C1/047B22F1/10
Inventor NAKAMURA, YOSHIBUMI
Owner SEIKO INSTR INC
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