Rapid forming method of high-performance Nd-Fe-B magnetic body

A high-performance NdFeB technology, applied in magnetic objects, magnetic materials, inorganic materials, etc., can solve problems such as easy formation of α-Fe soft magnetic phase, coarse structure of NdFeB ingots, and restrictions on the magnetic properties of magnets , to achieve good uniform distribution, inhibit the formation of α-Fe soft magnetic phase, and good grain orientation

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

However, the NdFeB ingot obtained by the casting process has problems such as coarse structure, poor uniformity, and easy formation of α-Fe soft magnetism, which seriously restricts the improvement of the magnetic properties of the magnet.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] 1) According to the magnet composition Nd 13 PR 5 Fe 73.6 B 8 al 0.3 Ga 0.1 Weigh the raw materials of each element and mix them;

[0022] 2) NdFeB alloy thin strips were prepared through the quick-setting strip stripping process, and the copper roller speed was 1.0m / s;

[0023] 3) Under the protection of Ar, NdFeB alloy strips were subjected to magnetic field-assisted laser melting deposition layer by layer. The magnetic field strength was 10T, the laser power was 5000W, the scanning speed was 100mm / s, the spot diameter was 0.8mm, and the overlap rate was 60 %, to make NdFeB magnets;

[0024] 4) Thermally deform the NdFeB magnet at 700°C with a pressure of 100MPa to strengthen the magnetic texture;

[0025] 5) Temper the heat-deformed NdFeB magnet at 650°C for 0.5h in vacuum to improve the grain boundary structure and magnet performance.

[0026] Compared with the casting-hot deformation process, the maximum magnetic energy product of the NdFeB magnet prepared ...

Embodiment 2

[0028] 1) According to the magnet composition Nd 14 Dy 2 Fe 73 co 2.5 B 7 Cu 1.5 Weigh the raw materials of each element and mix them;

[0029] 2) NdFeB alloy thin strips were produced through the quick-setting strip stripping process, and the copper roller speed was 1.6m / s;

[0030] 3) The NdFeB alloy thin strip is subjected to magnetic field-assisted laser melting deposition layer by layer under vacuum. The magnetic field strength is 12T, the laser power is 1000W, the scanning speed is 50mm / s, the spot diameter is 0.5mm, and the overlap rate is 20%. , to produce NdFeB magnets;

[0031] 4) Thermally deform the NdFeB magnet at 650°C with a pressure of 300MPa to strengthen the magnetic texture;

[0032] 5) Temper the heat-deformed NdFeB magnet at 480°C for 2h in vacuum at low temperature to improve the grain boundary structure and improve the magnet performance.

[0033] Compared with the casting-hot deformation process, the coercive force of the NdFeB magnet prepared b...

Embodiment 3

[0035] 1) According to the magnet composition Nd 12 PR 1 Ho 1 Fe 79.9 B 6 Zr 0.1 Weigh the raw materials of each element and mix them;

[0036] 2) NdFeB alloy thin strips are produced by the quick-setting strip stripping process, and the copper roller speed is 2m / s;

[0037]3) The NdFeB alloy thin strip is subjected to magnetic field-assisted laser melting deposition layer by layer under vacuum, the magnetic field strength is 20T, the laser power is 300W, the scanning speed is 80mm / s, the spot diameter is 0.2mm, and the overlap rate is 80%. , to produce NdFeB magnets;

[0038] 4) The NdFeB magnet is thermally deformed at 1000°C and the pressure is 200MPa to strengthen the magnetic texture;

[0039] 5) Temper the heat-deformed NdFeB magnet at 580°C for 4h in a vacuum at low temperature to improve the grain boundary structure and improve the magnet performance.

[0040] Compared with the casting-hot deformation process, the coercive force of the NdFeB magnet prepared by ...

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PUM

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Abstract

The invention discloses a rapid forming method of a high-performance Nd-Fe-B magnetic body, and relates to a preparation method of a permanent magnetic material. The rapid forming method comprises the steps of (1) weighing raw materials of each element according to the composition of a magnetic body, and mixing the raw materials; (2) preparing an Nd-Fe-B alloy strip through a rapid-hardening strip casting technology; (3) carrying out layer-by-layer magnetic-field-assisted laser melting deposition on the Nd-Fe-B alloy strip under protective atmosphere or vacuum, and preparing an Nd-Fe-B magnetic body; (4) carrying out thermal deformation on the Nd-Fe-B magnetic body, and strengthening a magnetic texture; (5)carrying out vacuum low-temperature tempering on the Nd-Fe-B magnetic body which is subjected to the thermal deformation, improving a grain boundary structure, and improving the performance of the magnetic body. The rapid forming method disclosed by the invention is suitable for preparing a large-size Nd-Fe-B magnetic body, and the prepared Nd-Fe-B magnetic body is small in grain, uniform in Nd-rich phase distribution, high in density, low in oxygen content and beneficial for improving the performance of the magnetic body. The preparation method disclosed by the invention is simple in technology, short in process, easy to operate and suitable for large-scale batch production.

Description

technical field [0001] The invention relates to the technical field of permanent magnet material preparation, in particular to a rapid prototyping method for a high-performance NdFeB magnet. Background technique [0002] NdFeB magnets are a new generation of rare earth permanent magnet materials with the advantages of excellent comprehensive magnetic properties, high cost performance and easy processing. in various replacement products. [0003] The magnetic properties of NdFeB magnets mainly come from Nd 2 Fe 14 The intrinsic magnetic parameters of B hard magnetic phase, such as anisotropy field and saturation magnetization, are closely related to the microstructure of the magnet, such as grain size and grain boundary structure. Powder metallurgy process is one of the important methods to prepare high-performance NdFeB magnets. At present, the maximum magnetic energy product of sintered NdFeB magnets produced by this process is close to 93% of the theoretical value, but ...

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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