Preparation method of permanent magnet material

A permanent magnet material, rare earth permanent magnet technology, applied in the direction of magnetic materials, magnetic objects, electrical components, etc., can solve the problems of inability to achieve magnet orientation, acceleration of densification process, decrease of coercive force, etc., to increase the comprehensive permanent magnet performance , high performance cost, the effect of reducing energy consumption

Inactive Publication Date: 2017-01-04
INST OF PHYSICS - CHINESE ACAD OF SCI
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Although with the development of modern technology, the performance of rare earth permanent magnet materials has been greatly improved, but compared with theoretical calculations, its permanent magnetic properties (especially coercive force) still have a lot of room for improvement.
[0003] Sintered NdFeB magnets are currently the most widely used in the market. This magnet has a high magnetic energy product and a relatively high coercive force, and has an important application range. However, the preparation of this sintered magnet still retains the traditional sintered magnet. process (vacuum sintering or low pressure sintering), due to the high sintering temperature and long sintering time required for complete densification, the grains of this magnet will grow during the sintering process, resulting in a decrease in coercive force and high energy consumption. Long preparation period
In order to reduce the grain size, plasma sintering (SPS) is used to prepar

Method used

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  • Preparation method of permanent magnet material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] (1) Preparation of two main alloys R M32 Fe 63 Zr 3 Al 0.9 B 1.1 and (Pr 0.4 Nd 0.6 ) 30 Fe 67 Al 2 B 1 , the total mass of the two main alloys is 2.5Kg, respectively prepared into quick-setting sheets with a thickness of 0.3mm.

[0028] (2) The above two main alloys are subjected to hydrogen crushing respectively to obtain particles with a particle size distribution of about 1-3 mm, and then respectively jet milled to obtain particles with an average particle size of about 2 μm.

[0029] (3) According to mass ratio R M32 Fe 63 Zr 3 Al 0.9 B 1.1 :(Pr 0.4 Nd 0.6 ) 30 Fe 67 Al 2 B 1 Mix the above jet-milled powder in a ratio of 30:70, weigh 10g of it, seal it, put it into an argon-protected magnetic field orientation mold, and perform orientation molding under a magnetic field of 1.5T (the pressure is about 20MPa).

[0030] (4) Put the molded magnet into a hot isostatic press under an isostatic pressure of 120MPa and a temperature of 900°C for 0.5 hou...

Embodiment 2

[0042] (1) Preparation (Nd 0.6 PR 0.4 ) 31 Fe 66 Cu 0.6 Zr 1 Ga 0.4 B 1 Alloy 2.5Kg, and made into 0.3mm quick-setting sheet.

[0043] (2) The above alloy is subjected to hydrogen crushing to obtain jet mill powder with a particle size of 1.5 μm.

[0044] (3) Weigh 10 g of it, seal it, put it into an argon-protected magnetic field orientation mold, and perform orientation molding under a magnetic field of 2T (the pressure is about 20 MPa).

[0045] (4) Put the molded magnet into a hot isostatic press under an isostatic pressure of 200MPa and a temperature of 800°C for 0.5 hours, and then quickly cool it through a built-in cooler (introducing Ar gas).

[0046] The magnet prepared above was processed into a small cylinder of Φ10mm×10mm and tested in a B-H loop instrument. The test results are also listed in Table 1.

[0047] It can be seen from the data in Table 1 that the rare earth permanent magnet prepared by the hot isostatic pressing technology of the present inven...

Embodiment 3

[0051] (1) Prepare R by mass ratio M28 Fe 67 Zr 3 al 1 B 1 and Pr 15 Nd 14 Fe 68 mn 1 co 1 B 1 The two main phase alloys have a total mass of 2.5Kg respectively. Jetmill particles of 1.4 μm and 2 μm were prepared as described in Example 1, respectively.

[0052] (2) Preparation of auxiliary alloy Ga 90 sn 10 : Ga and Sn are weighed according to the mass ratio, but they are not smelted. Instead, the two simple substances are mixed and ball milled directly to prepare particles with an average particle size of about 5 μm.

[0053] (3) two kinds of main phase alloys prepared by step (1) and the auxiliary alloy elemental ball mill particles obtained by step (2) according to R M28 Fe 67 Zr 3 al 1 B 1 : Pr 15 Nd 14 Fe 68 mn 1 co 1 B 1 : Ga 90 sn 10 Mix evenly in a mass ratio of 40:56:4. 10 g of it was weighed, sealed and put into an argon-protected magnetic field orientation mold for orientation molding under a magnetic field of 2T (pressure about 20 MPa). ...

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Abstract

The invention provides a preparation method of a permanent magnet material, comprising the steps of (1) preparing raw powder of permanent magnet material having a particle size of 0.01-5 Mum; (2) orient-forming the raw powder in the magnetic field 0.5-2 T under the protection an inert gas; (3), placing oriented magnet in a hot isostatic press, and pressing under 30-400 Mpa and 200-1100 DEG C for 0.1-4 h. After magnet powder is oriented, the magnet powder is subjected to hot isostatic sintering, the magnet is sintered with all-directional high pressure, it is possible to provide rapid sintering without a hot deformation process, and therefore, energy consumption is reduced and more excellent comprehensive permanent magnet performance is exhibited.

Description

technical field [0001] The invention relates to a method for preparing a permanent magnet material, in particular to a method for preparing a rare earth permanent magnet material using a hot isostatic pressing sintering technique. Background technique [0002] Rare earth permanent magnet materials (mainly NdFeB) can be used not only in civil products such as wind power generation, electric vehicles, nuclear energy safety, electronic instruments, and home appliances, but also in cutting-edge electronic communications, electronic interference and countermeasures, radar, aerospace, etc. In the field of technology, it is one of the important basic materials of modern industry, so it has received extensive attention at home and abroad. Although with the development of modern technology, the performance of rare earth permanent magnet materials has been greatly improved, but compared with theoretical calculations, its permanent magnetic properties (especially coercive force) still ...

Claims

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Application Information

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IPC IPC(8): B22F3/15H01F1/053
Inventor 左文亮沈保根赵同云孙继荣胡凤霞
Owner INST OF PHYSICS - CHINESE ACAD OF SCI
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