Preparation method of anisotropic nanocrystalline ndfeb dense permanent magnet

An anisotropic and nanocrystalline technology, applied in the direction of magnetic objects, inductor/transformer/magnet manufacturing, magnetic materials, etc., can solve the problems of high rare earth content, low rare earth content, low production cost, etc., and achieve simple preparation process, rare earth Less, less costly effect

Active Publication Date: 2017-12-15
重庆文童机电有限责任公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The currently used sintered Nd-Fe-B magnet has high remanence and coercive force, but its rare earth content is relatively high, especially contains more heavy rare earth elements, and there are also a large number of strategic elements such as Co, etc. The other is widely used The bonded magnets used are mostly made of nanocrystalline low-rare-earth NdFeB magnetic powder. This magnetic powder has low rare-earth content and low production cost. However, this type of magnetic powder is isotropic, and the magnets made from it are also isotropic. Yes, low remanence

Method used

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  • Preparation method of anisotropic nanocrystalline ndfeb dense permanent magnet
  • Preparation method of anisotropic nanocrystalline ndfeb dense permanent magnet
  • Preparation method of anisotropic nanocrystalline ndfeb dense permanent magnet

Examples

Experimental program
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Effect test

Embodiment 1

[0024] Embodiment 1, test sample I, a kind of preparation method of anisotropic nanocrystalline NdFeB dense permanent magnet, is prepared according to the following steps:

[0025] Step 1. According to Nd 11.5 Fe 81.5 Zr 1 B 6 The molar ratio of the alloy raw materials is configured, and the alloy ingot is made by using the magnetic levitation melting method, and the alloy ingot is repeatedly smelted three times to make the composition of the alloy ingot uniform, and then the alloy ingot is broken into small pieces and then melted quickly The alloy thin strip is made by quenching method, filled with argon gas during the rapid quenching process, the strip is vacuum-spun, and the roller speed is 30m / s, and the alloy thin strip is ground into 150μm Nd in a glove box. 11.5 Fe 81.5 Zr 1 B 6 alloy powder,

[0026] Step 2, utilizing the arc evaporation method to prepare nano-zinc powder, then adding the prepared nano-zinc powder to the Nd 11.5 Fe 81.5 Zr 1 B 6 In the alloy...

Embodiment 2

[0028] Embodiment 2, test sample II, a method for preparing an anisotropic nanocrystalline NdFeB dense permanent magnet, is prepared according to the following steps:

[0029] Step 1. According to Nd 11.5 Fe 81.5 Zr 1 B 6 The molar ratio of the alloy metal raw materials is configured, and the alloy ingot is made by magnetic levitation melting, and the alloy ingot is repeatedly smelted three times to make the composition of the alloy ingot uniform, and then the alloy ingot is broken and made by the melt rapid quenching method The alloy thin strip is filled with argon gas during the rapid quenching process, the strip is vacuum-spun, and the roller speed is 30m / s, and the alloy thin strip is ground into Nd with a particle size of 200 μm in a glove box. 11.5 Fe 81.5 Zr 1 B 6 alloy powder;

[0030] Step 2, utilizing the arc evaporation method to obtain spherical nano-zinc particles, and adding the prepared nano-zinc particles to the Nd 11.5 Fe 81.5 Zr 1 B 6 In the alloy ...

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Abstract

The invention discloses a preparation method of an anisotropic nanocrystal NdFeB compact permanent magnet. The method comprises the steps of firstly preparing alloy powder according to the molar ratio of Nd11.5Fe81.5Zr1B6, adding 1.5%-2% of zinc powder to the Nd11.5Fe81.5Zr1B6 alloy powder, and mixing the zinc powder and the Nd11.5Fe81.5Zr1B6 alloy powder evenly and then carrying out hot-pressing on the mixed powder to form a compact block; and carrying out thermal deformation on the compact block, completing deformation when the deformation quantity of thermal deformation reaches 65%-70% to obtain the anisotropic nanocrystal NdFeB compact permanent magnet. An alloy element Zr is added, an amorphous Nd11.5Fe81.5Zr1B6 strip is prepared by adopting a magnetic levitation melting technology and a vacuum melt spinning technology, and is mixed with a proper amount of nano Zn powder, so that the anisotropic nanocrystal NdFeB magnet is prepared by adopting a thermal deformation technology; c-axis orientation of the NdFeB alloy is improved; the prepared anisotropic nanocrystal NdFeB compact magnet contains scarce rare earth, has relatively high coercivity and excellent overall permanent magnet performance and does not contain a heavy rare earth element and a strategic element Co; and the used raw materials are low in cost.

Description

technical field [0001] The invention relates to the technical field of magnetic material preparation, in particular to a method for preparing an anisotropic nanocrystalline NdFeB dense permanent magnet. Background technique [0002] With the shortage of rare earth resources and the rapid increase of rare earth prices in recent years, the preparation of rare earth-free or rare-earth-poor permanent magnets has gradually become a research hotspot. As the third-generation permanent magnet material, NdFeB alloy has excellent magnetic properties and is widely used in electronics. , automotive and defense industries and many other fields. In recent years, with the rapid development of environment-friendly industries such as electronic information and electric vehicles and the shortage of rare earth resources, rare earth-poor permanent magnet materials have attracted widespread attention. [0003] The currently used sintered Nd-Fe-B magnet has high remanence and coercive force, but...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01F41/02H01F1/057
CPCH01F1/0576H01F41/0266
Inventor 马毅龙李兵兵孙建春李春红邵斌郭东林陈登明
Owner 重庆文童机电有限责任公司
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