Looking for breakthrough ideas for innovation challenges? Try Patsnap Eureka!

R-Fe-B porous magnet and method for producing the same

A manufacturing method, porous technology, applied in the direction of inductor/transformer/magnet manufacturing, permanent magnet manufacturing, magnetic objects, etc., can solve the problem of high DR processing temperature

Active Publication Date: 2009-01-14
HITACHI METALS LTD
View PDF7 Cites 11 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The treatment of compressed powder is equivalent to HDDR treatment, but the temperature of DR treatment is higher

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
  • R-Fe-B porous magnet and method for producing the same
  • R-Fe-B porous magnet and method for producing the same
  • R-Fe-B porous magnet and method for producing the same

Examples

Experimental program
Comparison scheme
Effect test

Embodiment approach

[0113] Hereinafter, preferred embodiments of the method for producing the R—Fe—B based porous magnet of the present invention will be described in detail.

[0114] (starter alloy)

[0115] First, an ingot of an R-T-Q-based alloy (starting alloy) having an R-Fe-B phase as a hard magnetic phase is prepared. Here, "R" is a rare earth element including Nd and / or Pr at 50 atomic % (at%) or more. The rare earth element R in this specification also includes yttrium (Y). "T" is at least one transition metal element selected from Fe, Co, and Ni, and is a transition metal element including 50% or more of Fe. "Q" is B, or a combination of B and a portion of B replaced by C.

[0116] The R-T-Q type alloy (starting alloy) includes Nd with a volume ratio of 50% or more 2 Fe 14 Type B compound phase (hereinafter abbreviated as "R 2 T 14 Q").

[0117] Most of the rare earth element R included in the starting alloy is composed of R 2 T 14 Q, but partly also constituted as R 2 o 3 W...

Embodiment 1

[0224] An alloy (target composition: Nd 13.65 Fe bal co 16 B 6.5 Ga 0.5 Zr 0.09 (atomic %)), a porous rare earth permanent magnet was produced by the production method of the above-mentioned embodiment. The unit of the numerical value in Table 1 is mass %. Hereinafter, the production method of this embodiment will be described.

[0225] [Table 1]

[0226] Alloy

Nd

Pr

Fe

co

B

Ga

Zr

A

29.7

0.1

remnant

14.3

1.06

0.50

0.13

[0227] First, a rapidly solidified alloy having a composition shown in Table 1 was produced by a strip casting method. The obtained rapidly solidified alloy was coarsely pulverized into a powder having a particle diameter of 425 μm or less by a hydrogen storage and collapse method, and then finely pulverized using a jet mill to obtain a fine powder with an average particle diameter of 4.4 μm. Moreover, the "average particle diamet...

Embodiment 2

[0244] Next, the porous magnet of Example 1 was pulverized with a mortar in an argon atmosphere, and classified to produce a powder having a particle diameter of 75 to 300 μm. This powder was put into a cylindrical container, oriented in a magnetic field of 800 kA / m, and fixed with paraffin. After the obtained sample was magnetized in a pulsed magnetic field of 4.8 MA / m, magnetic properties were measured with a vibrating sample type fluxmeter (VSM: device name VSM5 (manufactured by Toei Kogyo Co., Ltd.)). Also, no diamagnetic field correction is performed. The measurement results are shown in Table 3.

[0245] [table 3]

[0246] Alloy

J max

(T)

B r

(T)

h cB

(kA / m)

(BH) max

(kJ / m 3 )

h cJ

(kA / m)

h k

(kA / m)

A

1.16

1.14

595

203

864

338

[0247] J in the table max and B r The true density of the sample is 7.6g / cm 3 obt...

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
Crystal particle sizeaaaaaaaaaa
Long trailaaaaaaaaaa
Particle sizeaaaaaaaaaa
Login to View More

Abstract

Disclosed is an R-Fe-B porous magnet having an aggregate structure of Nd2Fe14B crystal phases having an average crystal grain size of not less than 0.1 [mu]m but not more than 1 [mu]m. At least a part of the R-Fe-B porous magnet has a porous structure comprising fine pores having a length of not less than 1 [mu]m but not more than 20 [mu]m.

Description

technical field [0001] The present invention relates to an R-Fe-B based porous magnet produced by the HDDR method and a method for producing the same. Background technique [0002] A representative R-Fe-B rare-earth magnet (R is a rare-earth element, Fe is iron, and B is boron), which is a representative high-performance permanent magnet, has R as a ternary system tetragonal compound. 2 Fe 14 Phase B has a structure of the main phase, and exhibits excellent magnetic properties. Such R—Fe—B based rare earth magnets are broadly classified into sintered magnets and bonded magnets. A sintered magnet is produced by sintering fine powder (average particle diameter: several μm) of an R-Fe-B-based magnet alloy by compression molding with a press device. On the other hand, bonded magnets are generally manufactured by compression molding a compound of R-Fe-B magnet alloy powder (particle diameter: about 100 μm, for example) and a binder resin, followed by injection molding. [000...

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): H01F1/08H01F1/06H01F1/053H01F41/02
CPCH01F1/0579Y10T428/12153H01F1/0573H01F1/0578H01F1/0576H01F41/028H01F1/057
Inventor 西内武司野泽宣介广泽哲槙智仁户次克典
Owner HITACHI METALS LTD
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Patsnap Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Patsnap Eureka Blog
Learn More
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic, Popular Technical Reports.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap|About US| Contact US: help@patsnap.com