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Gadolinium-containing sintered rare earth permanent magnet alloy and preparation method thereof

A technology of rare earth permanent magnets and alloys, which is applied in the field of magnetic materials, can solve the problems of increasing coercive force and limited temperature coefficient, narrow application range, and reducing costs, etc., and achieves the effect of simple and practical preparation method, low cost and low price

Inactive Publication Date: 2010-01-20
NINGBO KONIT IND +1
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] At present, the Chinese patent application number: 200710090597.3 has disclosed the Chinese patent application of the NdFeB rare earth permanent magnet alloy containing gadolinium with the addition ratio of 0.05wt.%<Gdwt.%≤0.5wt.%, to improve the coercive force of the magnet, Reduce the temperature coefficient, but its application range is too narrow, the improvement of coercivity and temperature coefficient is extremely limited, and it is not conducive to greatly reducing costs

Method used

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  • Gadolinium-containing sintered rare earth permanent magnet alloy and preparation method thereof
  • Gadolinium-containing sintered rare earth permanent magnet alloy and preparation method thereof
  • Gadolinium-containing sintered rare earth permanent magnet alloy and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1～6

[0034] By composition is (1)Nd 24.5 PR 5 Dy 2.5 Fe 65.05 co 1.5 Cu 0.15 al 0.3 B 1 Smelting ingots. Jet milling after hydrogen crushing, the prepared fine powder is oriented and formed in a magnetic field of 1.8-2T, and then isostatically pressed at 200MPa, and finally sintered at 1000-1200°C in a vacuum state to obtain a magnet at 480- Annealed at 600° C. for 5 hours to prepare a Gd-free NdFeB magnet as a control, see Example 1 in Table 1.

[0035] Using the method of the above-mentioned Example 1 to prepare different Gd contents between 0.5wt.% and 25wt.%, the components are (2) Nd respectively 24 PR 5 Dy 2.5 Gd 0.5 Fe 65.05 co 1.5 Cu 0.15 al 0.3 B 1 、(3)Nd 23.5 PR 5 Dy 2.5 Gd 1.0 Fe 65.05 co 1.5 Cu 0.15 al 0.3 B 1 、(4)Nd 22 PR 5 Dy 2.5 Gd 2.5 Fe 65.05 co 1.5 Cu 0.15 al 0.3 B 1 、(5)Nd 19.5 PR 5 Dy 2.5 Gd 5 Fe 65.05 co 1.5 Cu 0.15 al 0.3 B 1 、(6)Nd 4.5 Dy 2.5 Gd 25 Fe 65.05 co 1.5 Cu 0.15 al 0.3 B 1 See Table 1 for the room t...

Embodiment 7～9

[0048] The components are respectively (7)Nd 27 Dy 2.5 Gd 2.5 Fe 65.05 co 1.5 Cu 0.15 al 0.3 B 1 、(8)Nd 27 Tb 2.5 Gd 2.5 Fe 65.05 co 1.5 Cu 0.15 al 0.3 B 1 、(9)Nd 22 PR 5 Tb 1.25 Dy 1.25 Gd 2.5 Fe 65.05 co 1.5 Cu 0.15 al 0.3 B 1 The ingots were prepared according to the methods of Examples 1-6, and the results are shown in Table 3.

[0049] table 3

[0050] Reality

Embodiment 10～13

[0052] The components are respectively (10)Nd 27 Dy 2.5 Gd 2.5 Fe 65.05 co 1.5 Cu 0.15 al 0.3 B 1 、(11)Nd 24.5 Dy 5 Gd 2.5 Fe 65.05 co 1.5 Cu 0.15 al 0.3 B 1 、(12)Nd 27 Tb 2.5 Gd 2.5 Fe 65.05 co 1.5 Cu 0.15 al 0.3 B 1 、(13)Nd 24.5 Tb 5 Gd 2.5 Fe 65.05 co 1.5 Cu 0.15 al 0.3 B 1 The ingots were prepared according to the methods of Examples 1-6, and the results are shown in Table 4.

[0053] Table 4

[0054] Reality

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Abstract

The invention relates to a gadolinium-containing sintered neodymium-iron-boron rare earth permanent magnet alloy and a preparation method thereof. The permanent magnet alloy comprises components in the following formula: Re[alpha]Gd[beta]B[gamma]MxNyFe[100-alpha-beta-gamma-x-y], wherein the weight percentage beta of the gadolinium element is more than 0.50 and less than or equal to 25. Through the method for adding the Gd element into a sintered Nd-Fe-B magnet, a sintered Nd-Fe-B permanent magnet with high coercive force and high temperature resistance is prepared. The coercive force temperature coefficient beta of the prepared magnet is reduced, so the coercive force of the magnet at high temperature is improved and the magnet has the high temperature resistance.

Description

technical field [0001] The invention relates to the technical field of magnetic materials, in particular, the invention relates to a sintered NdFeB rare earth permanent magnet alloy containing gadolinium and a manufacturing method thereof. Background technique [0002] Since the discovery of Nd-Fe-B in the early 1980s, both the Nd-Fe-B permanent magnet material itself and its application technology have been developed rapidly. Nd-Fe-B permanent magnet materials have been widely used in voice coil motors of disk drives, various motors, nuclear magnetic resonance imaging equipment, electroacoustic devices, and magnetic machinery. However, since the magnetic properties of Nd-Fe-B magnets decrease sharply with the increase of temperature, and the negative temperature coefficient of remanence and coercive force is relatively large, the application in some high temperature (greater than 80 degrees) fields is greatly limited. . Generally, in order to improve the temperature resis...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01F1/057C22C1/02B22F3/12
Inventor 王惠新韦立立李正朱小矿钮萼陈超
Owner NINGBO KONIT IND
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