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Iron-boron-rare earth type pemanent magnetic material containing cerium, neodymium and/or praseodymium and its production method

A technology of permanent magnet material and light rare earth, applied in the direction of magnetic material, inorganic material magnetism, magnetic object, etc., can solve the problems of Fe-B-R magnet performance influence, etc., to achieve the effect of compensating for the lack of magnetic field strength and reducing cost

Inactive Publication Date: 2006-04-12
GENERAL ELECTRIC CO +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] None of these prior art patents disclose or imply the effect on the performance of Fe-B-R magnets if there is Ce present or part of R is the concentration of Ce
There is no teaching or suggestion in the prior art that Nd can be replaced as the concentration range of Ce in the rare earth element composition of Fe-B-R magnets, so as to obtain Fe-B-(Nd and / or Pr) permanent magnets with the same or better magnetic properties

Method used

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  • Iron-boron-rare earth type pemanent magnetic material containing cerium, neodymium and/or praseodymium and its production method

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Embodiment Construction

[0032] Since rare earth Ce generally coexists with Nd and Pr in nature, and reducing the content of Nd in rare earth permanent magnets is beneficial to cost, the applicant conducted experiments on Fe-B-R type permanent magnets with various Ce contents as rare earth components. The applicant further changed the relative ratio and concentration of Nd and / or Pr relative to the amount of Ce in the rare earth elements, and measured the magnetic properties of the manufactured Fe-B-R permanent magnet. Table 1 lists the results of 35 samples of Fe-B-R type permanent magnets, in which the composition of R was changed by using different ratios of Ce, Pr and Nd, where Pr, Ce and Nd are based on the weight percent of R.

[0033] sample

PR

(wt%)

Ce

(wt.%)

Nd

(wt.%)

ikB

(kOe)

B1-1

B1-2

B1-3

B2-1

B2-2

B2-3

B3-1

B3-2

B3-3

B4-1

B4-2

B4-3

B5-1

B5-2

B5-3

E0

E1

...

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Abstract

The Fe-B-R type permanent magnet includes 13-19 (atom)% of R, 4-20 (atom)% of B and the rest Fe, in which the R is basically formed from rare earth element mixture of Nd and / or Pr and Ce, and Ce is 0.2-5.0 wt% of R. Preferentially, R is 15-16 (atom)%,in which Ce is about 0.5%, the rest is rare earth Pr and Nd with ratio of 3 :1. Said invention also discloses a preparation method of the Fe-B-R permanent magnet material and its product.

Description

technical field [0001] The invention relates to a magnetic material composition and a production method thereof, in particular to an iron-boron-rare earth type (Fe-B-R) characteristic magnetic material. Background technique [0002] Since the 1980s, it has become common to use Fe-B-R type high-performance permanent magnet materials in which R is a rare earth element containing a high content element neodymium (Nd) in the industry. For example, computer hardware manufacturers require permanent magnets in such devices that manufacture small track, high volume computer data storage and retrieval hardware. Due to the strict size and weight limitations inherent in these data storage devices, the permanent magnets contained in these devices must be small in size yet highly magnetic to generate the required magnetic fields. This necessitates the use of high performance Fe-B-R rare earth permanent magnets in such devices. [0003] In addition, medical diagnostic equipment in the m...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01F1/053H01F1/057H01F1/08C22C38/00B22F3/16
CPCH01F1/0577H01F1/057
Inventor 陈蓓新王标倪德桢马克·G·宾兹江秋妙
Owner GENERAL ELECTRIC CO