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Anisotropic nanocrystal complex-phase compact block neodymium-iron-boron permanent-magnet material and preparation method thereof

An anisotropic, permanent magnet material technology, applied in the manufacture of magnetic materials, magnetic objects, inductors/transformers/magnets, etc., can solve problems such as gaps, save rare earth resources, improve magnet coercivity, and reduce the amount of rare earths Effect

Active Publication Date: 2012-06-13
NINGBO INST OF MATERIALS TECH & ENG CHINESE ACADEMY OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The use of amorphous matrix to achieve anisotropy and maintain the coherence of soft and hard magnetic phase grain interfaces is still in the initial stage of exploration. gap

Method used

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  • Anisotropic nanocrystal complex-phase compact block neodymium-iron-boron permanent-magnet material and preparation method thereof
  • Anisotropic nanocrystal complex-phase compact block neodymium-iron-boron permanent-magnet material and preparation method thereof

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] 1. Prepare nano-composite phase quenching strips by melt quenching technology, and break into powder with a particle size of 150 μm. The alloy composition is Nd21.452Pr0.42Fe74.294Co0.674B0.98Al0.479Cu0.11Nb1.591 (mass percent content);

[0024] 2. Using melt rapid quenching technology to prepare low melting point Nd90Cu10 liquid phase alloy with melting point lower than 800°C, and crush it into 50 μm powder;

[0025] 3. Mix the multi-phase alloy powder and the liquid-phase alloy powder evenly in a mass ratio of 95:5;

[0026] 4. Put the powder in the mold and put it into the vacuum hot pressing furnace to evacuate to 6×10 -3 After Pa, heat up to 700°C, pressurize to 270MPa, hold the pressure for 1 minute, then cool and take it out;

[0027] 5. Put the hot-pressed blank in the mold and put it into the vacuum hot-pressing furnace to evacuate to 6×10 -3 After Pa, charge 10 2 Pa argon, heat up to 850°C, pressurize for 10 5 MPa is deformed and oriented, and it is coole...

Embodiment 2

[0029] 1. Prepare nano-composite phase quenching strips by melt quenching technology, and break into powder with a particle size of 150 μm. The alloy composition is Nd21.452Pr0.42Fe74.294Co0.674B0.98Al0.479Cu0.11Nb1.591 (mass percent content);

[0030] 2. Using melt rapid quenching technology to prepare low melting point Nd90Cu10 liquid phase alloy with melting point lower than 800°C, and crush it into 50 μm powder;

[0031] 3. Mix the multi-phase alloy powder and the liquid-phase alloy powder evenly in a mass ratio of 92:8;

[0032] 4. Put the powder in the mold and put it into the vacuum hot pressing furnace to evacuate to 6×10 -3 After Pa, raise the temperature to 700°C, pressurize to 270MPa, hold the pressure for 40 seconds, then cool and take it out;

[0033] 5. Put the hot-pressed blank in the mold and put it into the vacuum hot-pressing furnace to evacuate to 6×10 -3 After Pa, charge 10 2 Pa argon, heat up to 850°C, pressurize for 10 5 MPa is deformed and oriented,...

Embodiment 3

[0036] 1. Prepare nano-composite phase quenching strips by melt quenching technology, and break into powder with a particle size of 150 μm. The alloy composition is Nd21.452Pr0.42Fe74.294Co0.674B0.98Al0.479Cu0.11Nb1.591 (mass percent content);

[0037] 2. Using melt rapid quenching technology to prepare low melting point Nd90Cu10 liquid phase alloy with melting point lower than 800°C, and crush it into 50 μm powder;

[0038] 3. Mix the multi-phase alloy powder and the liquid-phase alloy powder evenly in a mass ratio of 92:8;

[0039] 4. Put the powder in the mold and put it into the vacuum hot pressing furnace to evacuate to 6×10 -3 After Pa, heat up to 700°C, pressurize to 270MPa, hold the pressure for 1 minute, then cool and take it out;

[0040] 5. Aging the hot-pressed blank in a vacuum environment at 400°C for 30 minutes;

[0041] 6. Put the hot-pressed blank in the mold and put it into the vacuum hot-pressing furnace to evacuate to 6×10 -3 After Pa, charge 10 2 Pa a...

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Abstract

The invention relates to an anisotropic nanocrystal complex-phase compact block neodymium-iron-boron permanent-magnet material which is characterized by comprising a nanocrystal-structure hard magnetic phase and a soft magnetic phase, wherein the hard magnetic phase is a (Nd,R)2Fe17B phase, and R is selected from at least one of La, Ce, Pr, Gd, Tb and Dy; and the soft magnetic phase is at least one of alpha-Fe alpha-FeCo or Fe3B. The invention also discloses a preparation method of the permanent-magnet material. Compared with the prior art, the permanent-magnet material has the following advantages: due to the introduction of the soft magnetic phase, the coercive force of the nano complex-phase magnet is far lower than that of the single hard magnetic phase magnet, and the liquid phase is diffused into the nano complex-phase magnet and positioned at the grain boundary, thereby obviously enhancing the coercive force of the magnet.

Description

technical field [0001] The invention relates to a permanent magnet material, and also relates to a preparation method of the permanent magnet material. Background technique [0002] Since the 1980s, the third generation of rare earth permanent magnet materials-Nd 2 Fe 14 Since the discovery of B, researchers from all over the world have continued to carry out in-depth exploration, expecting to discover new rare earth permanent magnet materials with excellent permanent magnetic properties. The discovery of nano-composite permanent magnet materials has opened up new ideas for the development of new high-performance permanent magnet materials, which has important scientific significance and huge economic value. At present, the isotropic nanocrystalline composite phase permanent magnet materials are represented by the high magnetic energy quick-quenching magnetic powder developed by Magnequench, which is widely used in the form of bonded magnets. Because this magnetic powder e...

Claims

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Application Information

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IPC IPC(8): H01F1/057H01F41/02
Inventor 陈仁杰唐旭唐鑫尹文宗李东闫阿儒
Owner NINGBO INST OF MATERIALS TECH & ENG CHINESE ACADEMY OF SCI
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