Preparation method of high-performance anisotropic Nd-Fe-B magnetic body

An anisotropic, neodymium iron boron technology, applied in the direction of magnetic objects, inductance/transformer/magnet manufacturing, magnetic materials, etc., can solve the problem of poor temperature stability and corrosion resistance, and the coercive force cannot be effectively improved, etc. problem, to achieve the effect of improving the orientation degree of the magnet, high magnetic energy product, and refining the grain

Active Publication Date: 2014-03-12
东台城东科技创业园管理有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

After years of research and development, the maximum magnetic energy product of NdFeB magnets has reached 474 kJ / m 3 , close to 93% of the theoretical value, but its coercive force has not been effectively improved, and its temperature stability and corrosion resistance are also poor

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] 1) According to the magnet composition Nd 9 PR 4 Fe 80.9 B 6 Nb 0.1 Weigh the raw materials of each element and mix them;

[0022] 2) Put the mixed raw materials into a vacuum deposition furnace for melting, and spray deposition forming after refining. The atomization medium is argon with a purity greater than 99.99%, the atomization pressure is 3MPa, the atomization temperature is 1500°C, and the deposition disk rotates The speed is 50rpm, the descending speed of the deposition plate is 2mm / s, and the deposition distance is 300mm, and the NdFeB alloy blank is obtained;

[0023] 3) The NdFeB alloy blank is thermally deformed at 1000°C with a pressure of 150MPa to obtain a magnetic texture;

[0024] 4) The thermally deformed NdFeB alloy blank is subjected to vacuum heat treatment at 700°C under a 20T magnetic field for 4 hours to further strengthen the magnetic texture and obtain an anisotropic NdFeB magnet with complete orientation;

[0025] 5) The anisotropic NdF...

Embodiment 2

[0028] 1) According to the magnet composition Nd 14 Dy 1 Fe 74.5 co 2 B 6.5 Cu 1.5 Ga 0.5 Weigh the raw materials of each element and mix them;

[0029] 2) Put the mixed raw materials into a vacuum deposition furnace for smelting, and spray deposition forming after refining. The atomization medium is helium with a purity greater than 99.99%, the atomization pressure is 1.5MPa, and the atomization temperature is 1450°C. The rotation speed is 10rpm, the deposition disc descending speed is 1mm / s, and the deposition distance is 400mm to obtain the NdFeB alloy blank;

[0030] 3) Thermally deform the NdFeB alloy blank at 800°C with a pressure of 50MPa to obtain a magnetic texture;

[0031] 4) The thermally deformed NdFeB alloy blank is subjected to a vacuum heat treatment at 500°C under a 10T magnetic field for 2 hours to further strengthen the magnetic texture and obtain an anisotropic NdFeB magnet with complete orientation;

[0032] 5) The anisotropic NdFeB magnets are tem...

Embodiment 3

[0035] 1) According to the magnet composition Nd 16 Tb 0.1 Fe 73.9 co 2 B 6 Al 1.5Zr 0.5 Weigh the raw materials of each element and mix them;

[0036] 2) Put the mixed raw materials into a vacuum deposition furnace for melting, and spray deposition forming after refining. The atomization medium is helium with a purity greater than 99.99%, the atomization pressure is 1MPa, the atomization temperature is 1400°C, and the deposition disk rotates The speed is 30rpm, the descending speed of the deposition disk is 4mm / s, and the deposition distance is 600mm, and the NdFeB alloy blank is obtained;

[0037] 3) Thermally deform the NdFeB alloy blank at 650°C with a pressure of 300MPa to obtain a magnetic texture;

[0038] 4) The thermally deformed NdFeB alloy blank is subjected to a vacuum heat treatment at 800 °C under a 15T magnetic field for 1 hour to further strengthen the magnetic texture and obtain an anisotropic NdFeB magnet with complete orientation;

[0039] 5) The ani...

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Abstract

The invention discloses a preparation method of a high-performance anisotropic Nd-Fe-B magnetic body, and relates to a preparation technology of a permanent magnetic material. The preparation method comprises the main steps of (1) weighing raw materials of each element according to the composition of a magnetic body, and mixing the raw materials; (2) putting mixed raw materials into a vacuum deposition furnace for being smelted, carrying out spray deposition forming after the mixed raw materials are smelted, and obtaining an Nd-Fe-B parison alloy piece; (3) carrying out thermal deformation on the Nd-Fe-B alloy parison piece, and obtaining a magnetic texture; (4) carrying out vacuum strong magnetic field thermal treatment on the Nd-Fe-B alloy parison piece after the thermal deformation, further strengthening the magnetic texture, and obtaining an anisotropic Nd-Fe-B magnetic body; (5) carrying out vacuum low-temperature tempering on the anisotropic Nd-Fe-B magnetic body, improving a grain boundary structure, inproving the performance, and obtaining the high-performance anisotropic Nd-Fe-B magnetic body. The preparation method disclosed by the invention is simple in process, short in preparation process, easy to operate and suitable for large-scale batch production.

Description

[0001] technical field [0002] The invention relates to the technical field of permanent magnet material preparation, in particular to a method for preparing a high-performance anisotropic NdFeB magnet. Background technique [0003] NdFeB permanent magnet materials have excellent magnetic properties and high cost performance, and have become the basis of high-tech industries such as communications, medical care, automobiles, electronics, and aviation. The magnetic energy product of NdFeB magnets has been greatly developed, but its low coercive force, poor temperature stability and corrosion resistance still seriously limit the further expansion of its application range. Therefore, under the premise of ensuring a high magnetic energy product, the development of high coercive force, heat-resistant and corrosion-resistant NdFeB magnets has become an important task at this stage. [0004] At present, high-performance NdFeB permanent magnet materials are mainly sintered NdFeB p...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01F41/02H01F1/057H01F1/08B22F3/16
Inventor 崔熙贵崔承云程晓农许晓静张洁
Owner 东台城东科技创业园管理有限公司
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