A low temperature coefficient sm 2 co 17 Type sintered magnet and its preparation method

A low temperature coefficient, sintered magnet technology, applied in the direction of inductance/transformer/magnet manufacturing, magnetic objects, magnetic materials, etc., can solve the problems of low intrinsic coercive force, reduced intrinsic coercive force, and high cost, and achieve magnetic High energy, less heavy rare earth content, and low cost

Active Publication Date: 2021-02-26
CHINA JILIANG UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] With the development of my country's aerospace and national defense industries, conventional SmCo permanent magnets and NdFeB permanent magnets can no longer meet their needs.
Traditional SM 2 co 17 Although the Curie temperature of sintered magnets is much higher than that of NdFeB permanent magnets, its intrinsic coercive force will decrease with the increase of working temperature, so that it cannot maintain stable working performance and make the magnets have lower The temperature coefficient becomes very necessary
While the existing anomalous temperature coefficient Sm 2 co 17 Although its intrinsic coercive force increases with the increase of temperature in a certain temperature range, it is difficult to meet the actual performance requirements due to its low intrinsic coercive force (~0.1T).
While traditional RE(CoFeCuZr) z (RE is Sm, Dy, Er, Gd) to prepare low temperature coefficient Sm 2 co 17 The proportion of heavy rare earth elements can reach 60% in the type sintered magnet, and the price of heavy rare earth elements is much more expensive than that of light rare earth elements, which greatly increases the price of magnets

Method used

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  • A low temperature coefficient sm <sub>2</sub> co <sub>17</sub> Type sintered magnet and its preparation method
  • A low temperature coefficient sm <sub>2</sub> co <sub>17</sub> Type sintered magnet and its preparation method
  • A low temperature coefficient sm <sub>2</sub> co <sub>17</sub> Type sintered magnet and its preparation method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] (1) Alloy Sm(CoFeCuZr) z , by mass percentage, Sm=15%, Co=77.5%, Fe=5%, Cu=2%, Zr=0.5%, weigh the raw materials according to the mass ratio of the above elements, mix the raw materials for vacuum induction melting, The power is 45kW, the vacuum degree is less than 5*10 -2 Pa, after the metal is melted, it is refined for 5-10 minutes to make an alloy ingot and coarsely crushed until the particle size of the powder is 300-500 μm.

[0020] (2) Alloy RECuZr (RE is Dy, Er) according to mass percentage, Dy=40%, Er=30%, Cu=20%, Zr=10%, weigh raw material according to the mass ratio of above-mentioned each element, the raw material Mixing for vacuum induction melting, the power is 45kW, the vacuum degree is less than 5*10 -2 Pa, after the metal is melted, it is refined for 5-10 minutes to obtain an alloy ingot, and is then high-energy ball milled to produce a DyErCuZr alloy powder with a particle size of 50-200nm.

[0021] (3) Sm(CoFeCuZr) obtained in step (1) z Coarse allo...

Embodiment 2

[0046] (1) Alloy Sm(CoFeCuZr) z , by mass percentage, Sm = 20%, Co = 72.5%, Fe = 5%, Cu = 2%, Zr = 0.5%, weigh the raw materials according to the mass ratio of the above elements, and then mix the raw materials for vacuum induction melting , power is 45kW, vacuum degree is less than 5*10 -2 Pa, after the metal is melted, it is refined for 5-10 minutes to make alloy ingots and coarsely crushed until the powder particle size is 300-500μm;

[0047] (2) Alloy RECuZr (RE is Dy, Gd) according to mass percentage, Dy=40%, Gd=30%, Cu=20%, Zr=10%, weigh raw material according to the mass ratio of above-mentioned each element, the raw material Mixing for vacuum induction melting with a power of 45kW and a vacuum degree of less than 5*10 -2 Pa, after the metal is melted, refining is carried out for 5-10 minutes to obtain an alloy ingot, and the Dy GdCuZr alloy powder is produced by high-energy ball milling, and the particle size of the powder is 50-200nm.

[0048] (3) Step (1) to get S...

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Abstract

The invention discloses a low temperature coefficient Sm 2 co 17 Type sintered magnet and preparation method thereof, the present invention prepares alloy ingot Sm(CoFeCuZr)z alloy and RECuZr alloy respectively, makes powder after breaking respectively, mixes alloy powder, ball mills, then carries out magnetic field orientation and cold isostatic pressing treatment It is made into a compact, and then sintered, solid solution and tempered to obtain a low temperature coefficient Sm 2 co 17 type sintered magnets. The preparation method of the invention can produce a magnet with a lower temperature coefficient of remanence, and the magnet has higher magnetic performance, less heavy rare earth content and lower cost.

Description

technical field [0001] The invention belongs to the field of permanent magnet material preparation, in particular to a low temperature coefficient Sm 2 co 17 Type sintered magnet and its preparation method. Background technique [0002] With the development of my country's aerospace and national defense industries, conventional SmCo permanent magnets and NdFeB permanent magnets can no longer meet their needs. Traditional SM 2 co 17 Although the Curie temperature of sintered magnets is much higher than that of NdFeB permanent magnets, its intrinsic coercive force will decrease with the increase of working temperature, so that it cannot maintain stable working performance and make the magnets have lower The temperature coefficient is very necessary. While the existing anomalous temperature coefficient Sm 2 co 17 Although its intrinsic coercive force increases with the increase of temperature in a certain temperature range, it is difficult to meet the actual performance ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01F1/055H01F41/02
CPCH01F1/0557H01F41/0253H01F41/0266H01F41/0273
Inventor 俞能君单杰峰张朋越泮敏翔吴琼葛洪良
Owner CHINA JILIANG UNIV
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