Preparation method of rare earth permanent magnet material

A rare-earth permanent magnet and rare-earth technology, which is applied in the manufacture of magnetic materials, magnetic objects, inductors/transformers/magnets, etc., can solve the problems of high equipment cost and low production efficiency, and achieve improved corrosion resistance and magnet coercive force , the effect of easy diffusion

Inactive Publication Date: 2021-02-26
ZHEJIANG INNUOVO MAGNETICS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Among them, magnetron sputtering and vapor deposition methods have high equipment costs and low production efficiency

Method used

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  • Preparation method of rare earth permanent magnet material

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preparation example Construction

[0020] The preparation method of a kind of rare earth permanent magnet material of the present invention comprises the following steps:

[0021] (1) Prepare R a T b A c m d Composition of sintered magnets; wherein, R is composed of at least one rare earth element (including scandium Sc and yttrium Y), T is composed of Fe and / or cobalt Co, A is composed of boron B and / or carbon C, M is composed of Al, Cu , Zn, In, Si, P, S, Ti, V, Cr, Mn, Ni, Ga, Ge, Zr, Nb, Mo, Pd, Ag, Cd, Sn, Sb, Hf, Ta and W Element composition; a~d represent the atomic percentage based on the alloy, and the range is as follows: 10%≤a≤15%, 3%≤c≤15%, 0.01%≤d≤11%, and b is the balance.

[0022] (2) After cutting the magnet to be sintered into the required shape (thickness not greater than 15mm), wash with acid, alkali or organic solvent; the alkali that can be used includes potassium pyrophosphate, sodium pyrophosphate, potassium citrate, citric acid Sodium, potassium acetate, sodium acetate, potassium ox...

Embodiment

[0027] The embodiment of the preparation method of a kind of rare earth permanent magnet material of the present invention, comprises the following steps:

[0028] (1) Prepare R a T b A c m d A sintered magnet composed of the following substeps:

[0029] (1.1) The composition of the design magnet (Nd 0.74 PR 0.2 Dy 0.06 ) 30 Fe bal co 1.3 Cu 0.15 al 0.3 B 1 ; Among them, bal represents the balance, adding Cu and Al two low-melting point elements, these two elements are easy to distribute in the grain boundary phase, and have the obvious effect of refining the grain. Using the technology of vacuum quick-setting flakes, by adjusting the rotation speed of the rollers and the flow rate of circulating water, and adjusting the cooling rate, the quick-setting flakes with better growth of columnar crystals were finally obtained.

[0030](1.2) The quick-setting tablet of this composition is prepared into powder particles of 2-4 μm by hydrogen breaking and jet milling techn...

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Abstract

The invention discloses a preparation method of a rare earth permanent magnet material, which comprises the following steps: arranging rare earth bromide powder on the surface of a sintered magnet, and carrying out heat treatment on the magnet and the powder at a temperature lower than the sintering temperature of the magnet so as to carry out rare earth diffusion. According to the method, Br witha large atomic radius is used for replacing an F or O element, rare earth bromide is used as a novel grain boundary diffusion source, the surface of the sintered magnet is coated with the novel diffusion source, and rare earth elements are diffused into the magnet through tempering treatment; the rare earth bromide has the characteristics that the rare earth bromide is easy to decompose, the atomic radius of the bromine element is large, the bromine element is easily volatilized into the environment and only slightly diffuses into the magnet, the influence on the microstructure of the magnetis small, rare earth elements are easier to diffuse into the magnet, the diffusion depth is large, and the coercive force of the magnet is obviously improved; and meanwhile, the temperature stabilityand the corrosion resistance of the magnet are improved.

Description

technical field [0001] The invention belongs to the technical field of magnetic materials, and in particular relates to a preparation method of a rare earth permanent magnet material. Background technique [0002] Sintered NdFeB is the permanent magnet material with the highest magnetic energy product so far. The magnetic energy product is a manifestation of permanent magnet energy storage. In the open circuit state, part of it is stored inside the permanent magnet, and part of it is stored in the space near the two magnetic poles in the form of a magnetic field to realize the interaction between mechanical energy and electromagnetic energy. convert. The high magnetic energy product realizes the miniaturization and light weight of the device, and is widely used in computers, electroacoustic devices, instruments, magnetic machinery, permanent magnet motors, nuclear magnetic resonance instruments and other equipment. [0003] However, the low Curie temperature and poor tempe...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01F41/02H01F1/057H01F1/055
CPCH01F41/0293H01F1/057H01F1/0557
Inventor 魏中华陈小平赵栋梁石晓宁沈晓杰许丁丁张晓伟陆枝建童卫民
Owner ZHEJIANG INNUOVO MAGNETICS
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