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Method for forming nano crystal double phase anisotropic neodymium iron boron binding magnet and apparatus thereof

An anisotropic, bonded magnet technology, applied in the manufacture of inductors/transformers/magnets, electrical components, circuits, etc., can solve the problems of low magnet density, multiple binders, poor magnetic properties of anisotropic bonded magnets, etc. , to achieve the effect of increasing density, reducing cost and improving magnetic performance

Inactive Publication Date: 2008-07-09
SHANGHAI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

They have two common problems: 1) the powder before molding is anisotropic NdFeB magnetic powder, 2) more binder is needed during molding, and the magnet density obtained by molding is small, and the anisotropic Bonded magnets have poor magnetic properties

Method used

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  • Method for forming nano crystal double phase anisotropic neodymium iron boron binding magnet and apparatus thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] In the embodiment, the nanocrystalline isotropic NdFeB magnetic powder is prepared in this way. Firstly, the raw materials are prepared, and the Nd 8.5 (FeCoZr) 84.5 Cr 0.5 B 6.5 On the basis of the stoichiometric formula, the amorphous magnet is obtained by the melt rapid quenching method, and then the nanocrystalline dual-phase magnet powder is obtained through crystallization treatment; the nanocrystalline dual-phase isotropic NdFeB magnetic powder is bonded with 0.2wt% Mix the powder evenly, and then put it into the steel casing 6, the wall thickness of the steel casing 6 is 1.5mm, slowly carry out the powder filling, and vibrate while loading, and at the same time, it is treated under a 12T magnetic field, The upper and lower ends of the casing 6 are welded and sealed with steel plugs 4; the casing 6 is placed on a circular plastic plate fixed base 8, the thickness of which is 10 mm, the base is placed on a level ground, and a circular explosive is placed on the ...

Embodiment 2

[0024] Evenly mix the nanocrystalline dual-phase isotropic NdFeB magnetic powder with 0.3wt% binder, then put it into the steel casing 6, the wall thickness of the steel casing 6 is 1mm, and slowly carry out the powder loading .While loading and vibrating, and at the same time processed under a 10T magnetic field, the upper and lower ends of the casing 6 are welded and sealed with steel plugs 4; the casing 6 is placed on a circular plastic plate fixing base 8, the thickness of which is 10mm, the base is placed on the level ground, a round explosive cartridge is placed on the base, a removable compact 3 is placed on the plug at the upper end of the casing 6, and then explosives are evenly loaded in the explosive cartridge, and the explosive is ammonium nitrate Base explosives with a density of 0.90g / cm 3, the thickness of the loaded explosives is 60mm. The detonator is released by the detonating system 1 at the tip of the top of the explosive cartridge for detonation. The sho...

Embodiment 3

[0026] Evenly mix the nanocrystalline dual-phase isotropic NdFeB magnetic powder with 0.5wt% binder, then put it into the steel casing 6, the wall thickness of the steel casing 6 is 1mm, and slowly carry out the powder loading , and vibrate while loading, and at the same time through the treatment under the 13T magnetic field, the upper and lower ends of the casing 6 are welded and sealed with steel plugs 4; the casing 6 is placed on the circular plastic plate fixed base 8, the thickness 10mm, the base is placed on the level ground, a round explosive cartridge is placed on the base, a removable compact 3 is placed on the plug at the upper end of the casing 6, and then explosives are evenly loaded in the explosive cartridge, and the explosive is ammonium nitrate Base explosives with a density of 1.2g / cm 3 , the thickness of the loaded explosives is 65mm. The detonator is released by the detonating system 1 at the tip of the top of the explosive cartridge for detonation. The s...

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Abstract

An explosion method for shaping the adhered dual-phase nano-crystalline anisotropic NdFeB magnet includes such steps as loading the isotropic NdFeB magnet powder in sleeve steel cylinder, treating by magnetic field, fixing the sleeve steel cylinder onto base with an explosive tube on it, filling explosive in the tube, and exploding. Its advantages are high density and high magnetic performance.

Description

technical field [0001] The invention relates to a nanocrystalline dual-phase anisotropic NdFeB bonded magnet or a metal powder molding method and a special device thereof, belonging to the technical field of metal powder pressure molding technology. Background technique [0002] Nanocrystalline dual-phase composite permanent magnet alloy is a new concept of permanent magnet material proposed in recent years. This type of alloy combines the high magnetocrystalline anisotropy of the hard magnetic phase and the high saturation magnetization of the soft magnetic phase. Ferromagnetic exchange coupling, resulting in high overall magnetic properties. A notable feature of this alloy is the remanence increase effect. In addition, the content of expensive rare earths is reduced, resulting in good economic benefits. The hard magnetic phase is Nd 2 Fe 14 B or Sm 2 Fe 17 N 3 , the soft magnetic phase is Fe 3 B or a-Fe, etc., the magnetic material alloy used in this patent is nanoc...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B22F3/08H01F41/02
Inventor 侯雪玲张岸李士涛孔俊峰汪洋倪建森徐晖周邦新张士岩王占勇沈绍义黄照华郭悦霞李莹
Owner SHANGHAI UNIV
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