Fully-dense block-shaped anisotropy nanocrystal Sm2Co7 magnet and preparation method thereof

An anisotropic, nanocrystalline technology, used in magnetic objects, inductance/transformer/magnet manufacturing, magnetic materials, etc., can solve the problems of long production cycle, poor product consistency, complex process, etc., to achieve low cost and short production cycle , the effect of simple preparation process

Inactive Publication Date: 2018-07-20
BEIJING UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The SmCo-based permanent magnet alloy permanent magnet alloy prepared by this method has high magnetic properties, but it has the following disadvantages: First, the grain size of the prepared alloy is in the micron scale, so the mechanical properties and corrosion resistance of the alloy are relatively low. Poor, to a certain extent, limits the scope of application of the alloy; secondly, the traditional powder metallurgy process has problems such as complicated procedures, long production cycle and poor product consistency, which makes the manufacturing cost of the alloy remain high
However, no dense magnetic anisotropy Sm has been obtained by alloy plastic deformation 2 co 7 precedent for magnets

Method used

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  • Fully-dense block-shaped anisotropy nanocrystal Sm2Co7 magnet and preparation method thereof
  • Fully-dense block-shaped anisotropy nanocrystal Sm2Co7 magnet and preparation method thereof

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Experimental program
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Embodiment 1

[0016] 1) Smelting Sm with a purity greater than 99.9% and Co metal with a purity greater than 99.9% in a suspension furnace to smelt the master alloy, Sm 2 co 7 The composition adopted by the magnet is that the mass ratio of Sm is 44.52%, and the mass ratio of Co is 55.48% (Sm is equivalent to Sm 2 co 7 Sm in excess of 10%)). The master alloy was rapidly quenched to obtain a rapidly quenched strip, and then the high-energy ball milling method was used for 5 hours under the protection of argon with a purity of 99.999%, and the Sm 2 co 7 Ingot ball milled into Sm 2 co 7 Amorphous powder;

[0017] 2) After the amorphous alloy powder is loaded into the tungsten carbide cemented carbide mold, rapid hot-pressing treatment is performed to obtain fully dense isotropic nanocrystalline Sm 2 co 7 For magnets, the process parameters of rapid hot pressing are: under the pressure of 500Mpa, the temperature is raised from room temperature to 650°C at a heating rate of 50°C / min, with...

Embodiment 2

[0021] 1) Smelting Sm with a purity greater than 99.9% and Co metal with a purity greater than 99.9% in a suspension furnace to smelt the master alloy, Sm 2 co 7 The composition used for the magnet was 44.52% by mass of Sm and 55.48% by mass of Co. Rapidly quench the master alloy to obtain rapidly quenched thin strips, and then use high-energy ball milling method for 5 hours under the protection of argon with a purity of 99.999%, and the Sm 2 co 7 Ingot ball milled into Sm 2 co 7 Amorphous powder;

[0022] 2) After the amorphous alloy powder is loaded into the tungsten carbide cemented carbide mold, rapid hot-pressing treatment is performed to obtain fully dense isotropic nanocrystalline Sm 2 co 7 For magnets, the process parameters of rapid hot pressing are as follows: under a pressure of 500Mpa, at a heating rate of 50°C / min, the temperature is raised from room temperature to 650°C, and the temperature is kept for 10 minutes;

[0023] 3) For fully dense isotropic Sm ...

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Abstract

The invention relates to a fully-dense block-shaped anisotropy nanocrystal Sm2Co7 magnet and a preparation method thereof, and belongs to the field of magnetic material preparation. A fully-dense block-shaped Sm2Co7 nanocrystal permanent-magnet is prepared by melting mother alloy from Sm and Co, ball-milling, rapid hot press and thermal deformation. The Sm2Co7 magnet prepared by the method has obvious C-axis crystal texture and corresponding remarkable magnetic anisotropy.

Description

technical field [0001] The invention belongs to the field of magnetic material preparation, in particular to a fully dense block anisotropic nanocrystalline Sm 2 co 7 The method of making the magnet. Background technique [0002] SM 2 co 7 Permanent magnet alloys have excellent intrinsic magnetism and good high-temperature characteristics, that is, alloys can still maintain high magnetic properties in high-temperature environments. Therefore, it has great applications in environments with high temperature requirements. However, this type of permanent magnet material has not been well applied so far due to the unsuitable composition and process. At present, SmCo-based permanent magnet alloys are generally prepared in industry by traditional powder metallurgy methods, which basically include the following processes: alloy smelting → crushing powder → magnetic field orientation pressing → sintering → heat treatment → processing and forming. The SmCo-based permanent magnet...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01F1/055H01F41/02C22C19/07C22F1/10
CPCC22C19/07C22C2200/04C22F1/10H01F1/0556H01F41/0266
Inventor 马强岳明徐晓厂张红国张东涛李玉卿张久兴
Owner BEIJING UNIV OF TECH
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