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Method for forming nano crystal neodymium iron boron binding magnet

A technology of bonding magnets and forming methods, which is applied in the manufacture of inductors/transformers/magnets, electrical components, circuits, etc., and can solve the problems of not too high pressure, poor performance, and low magnet density

Inactive Publication Date: 2008-05-28
SHANGHAI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Due to the addition of more non-magnetic resin binder 2.9wt% during granulation in this process, at the same time, the compression molding method limits the pressure not to be too high due to the limitation of mold strength, and the density of the obtained magnet is low. , poor performance

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0015] In this example, Nd 8.5 (FeCoZr) 84.5 Cr 0.5 B 6.5 The basis of the stoichiometric formula Prepare the raw materials, obtain the amorphous magnet through the melt quenching method, and obtain the nanocrystalline NdFeB magnet powder through crystallization treatment; use the above nanocrystalline NdFeB magnet powder and 0.5wt% binder to uniformly The NdFeB mixture is obtained by mixing, and the particle size range of the nanocrystalline NdFeB powder is 100 mesh. Put the above mixture in a rubber sleeve, and treat it with isostatic pressure at 650Mpa at room temperature for 1min, take out the mixture from the rubber sleeve, and then cure it at 150°C for 1h to obtain nanocrystalline neodymium with high density and high magnetic properties Iron boron magnets.

[0016] The density and magnetic properties of the prepared nanocrystalline NdFeB magnet are obviously improved. Its magnet density is from 6.037g / cm 3 Increased to 6.78g / cm 3 , the remanence Br increased from ...

Embodiment 2

[0018] In this example, Nd 8.5 (FeCoZr) 84.5 Cr 0.5 B 6.5 The basis of the stoichiometric formula is to prepare the raw materials, obtain the amorphous magnet through the melt quenching method, and obtain the nanocrystalline magnet powder through crystallization treatment, and the particle size of the powder is 120 mesh; use the above nanocrystalline NdFeB magnet powder with 0.2wt% The binder is uniformly mixed to obtain a NdFeB mixture; the above mixture is placed in a rubber sleeve, subjected to isostatic pressure treatment at a pressure of 600Mpa at room temperature for 1min, the mixture is taken out from the rubber sleeve, and then cured at 160°C for 1.5h, that is Nanocrystalline NdFeB magnets with high density and high magnetic properties can be obtained. The density and magnetic properties of the prepared nanocrystalline NdFeB magnet are obviously improved. Its magnet density is 6.56g / cm 3 , the remanence Br is 0.651T (Tesla), the intrinsic coercive force jHe is 632...

Embodiment 3

[0020] In this example, Nd 8.5 (FeCoZr) 84.5 Cr 0.5 B 6.5 The basis of the stoichiometric formula is to prepare the raw materials, obtain the amorphous magnet through the melt quenching method, and obtain the nanocrystalline magnet powder through crystallization treatment, and the particle size of the powder is 140 mesh; use the above nanocrystalline NdFeB magnet powder and 0.7wt% The binder is uniformly mixed to obtain a NdFeB mixture; the above mixture is placed in a rubber sleeve, subjected to isostatic pressure treatment at room temperature at a pressure of 750Mpa for 1min, the mixture is taken out from the rubber sleeve, and then cured at 180°C for 1h. A nanocrystalline NdFeB magnet with high density and high magnetic performance is obtained. The density and magnetic properties of the prepared nanocrystalline NdFeB magnet are obviously improved. Its magnet density is 7.10g / cm 3 , the remanence Br is 0.691T (Tesla), the intrinsic coercive force jHe is 640KA / m, and the...

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Abstract

An isostatic pressing method for shaping the adhered nano-crystalline NdFeB magnet includes such steps as proportionally mixing the nano-crystalline NdFeB magnet powder with adhesive, loading the mixture in sleeve rubber pipe, isostatic pressing under 500-800 MPa, and solidifying at 130-200 deg.C. Its advantages are high density, high magnetic performance and less consumption of adhesive.

Description

technical field [0001] The invention relates to a forming method of a nanocrystalline neodymium-iron-boron bonded magnet, which belongs to the technical field of metal powder pressure forming technology. Background technique [0002] Nanocrystalline dual-phase NdFeB is composed of soft magnetic phase a-Fe with nano-grain size and hard magnetic phase Nd 2 Fe 14 B composition. When the grain size of the two phases is several to tens of nanometers, strong exchange coupling will occur between the particles, resulting in enhanced remanence. This nanocomposite composed of "exchange elastic coupling" is the key to obtain high magnetic energy. It is a new way of product, and the theory predicts that its maximum magnetic energy product can be as high as 1MJ / m 3 , much higher than the current sintered NdFeB magnet with the highest magnetic energy product, and is widely used in the automotive industry, small and large instruments or devices, audio, mobile phones, earphones, CD drive...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B22F3/02H01F41/02
Inventor 侯雪玲张岸李士涛孔俊峰倪建森徐晖周邦新沈绍义
Owner SHANGHAI UNIV
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