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Method for preparing micron/nano particles of rare earth-transition group permanent magnetic alloy

A permanent magnet alloy and nanoparticle technology, applied in the direction of magnetic materials, magnetic objects, electrical components, etc., can solve the problems of rare earth permanent magnet nanoparticles, large micro/nanoparticle size, magnetic oxidation properties, etc., and achieve good application value , low cost, and the effect of improving magnetic properties

Inactive Publication Date: 2016-03-23
NINGBO INST OF MATERIALS TECH & ENG CHINESE ACADEMY OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, it is difficult to prepare rare earth permanent magnetic nanoparticles by chemical synthesis, and the process is complicated. In addition to the need to solve the reduction of rare earth metals (rare earth metals generally exist in the form of oxides), it is also necessary to focus on overcoming the oxidation problem in the preparation.
The process of preparing rare earth permanent magnetic nanoparticles by surfactant-assisted ball milling is simple, but at present, ball milling at room temperature is generally used, and the obtained micro / nano particles are large in size, low in yield, and also face the problems of poor oxidation and magnetic properties.

Method used

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  • Method for preparing micron/nano particles of rare earth-transition group permanent magnetic alloy
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  • Method for preparing micron/nano particles of rare earth-transition group permanent magnetic alloy

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Embodiment 1

[0039] In this embodiment, the ratio of raw materials and grinding balls is exactly the same as that in Comparative Example 1 above. The process of ball milling the raw material into Nd-Fe-B permanent magnetic alloy micro / nano particles is as follows.

[0040] (1) Immerse the ball mill tank in liquid nitrogen for 1-1.5 minutes to treat it at low temperature, make the temperature of the ball mill tank lower than -150°C, take it out, install it on a high-energy ball mill, and mill it at room temperature for 3 minutes;

[0041] (2) Repeat step (1) until the total ball milling time is 6 min, 12 min, 21 min, 33 min, 42 min, 60 min, 90 min and 120 min, then remove the ball mill jar and collect the ball mill product.

[0042] The ball milling product gained after ball milling 6min, 12min, 21min, 33min, 42min, 60min, 90min and 120min in above-mentioned comparative example 1 and embodiment 1 is compared, and the results are as follows:

[0043](1) The SEM pictures of the Nd-Fe-B parti...

Embodiment 2

[0052] In this embodiment, the raw materials are exactly the same as those used in Comparative Example 2 above. This raw material is ball milled into SmCo 5 The process of permanent magnetic alloy micro / nano particles is as follows:

[0053] Choose a three-dimensional vibratory high-energy ball mill, put the raw materials into a stainless steel ball mill tank, then add oleylamine surfactant with a mass of 50% of the raw material, and then add stainless steel balls with a diameter of 6.5mm and 9.5mm, and the ball-to-material ratio is 15:1 . Seal the ball mill tank with raw materials, grinding balls and surfactant in a glove box, and the protective gas is high-purity Ar gas, and then carry out the following steps (1)-(2):

[0054] (1) Place the ball mill jar in liquid nitrogen for low-temperature treatment, take it out after the temperature of the ball mill jar is kept below -150°C, and install it on a ball mill at room temperature for 5 minutes of ball milling;

[0055] (2) ...

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Abstract

The invention provides a method for preparing micron / nano particles of rare earth-transition group permanent magnetic alloy. A traditional ball-milling method is improved through the method, and a ball-milling process of raw materials in the normal temperature is improved to be a dry ball-milling process of the raw materials in the low temperature. Firstly, the fragility of the materials is increased through a low temperature environment, so that the particle size of the materials is finer and more uniform; secondly, ball milling conducted in the low temperature can further inhibited oxidation of the rare earth-transition group permanent magnetic alloy effectively; finally, more defects and larger stress exist inside the particles, and accordingly the magnetic property of the particles is improved. An experiment confirms that the method is low in cost, simple and easy to achieve; it is the first time to find that the method can effectively decrease the particle size of the rare earth-transition group permanent magnetic alloy, the uniformity of the particle size of the rare earth-transition group permanent magnetic alloy is improved, oxidation of the alloy is inhibited, and the magnetic property is improved; the method has excellent application value.

Description

technical field [0001] The invention belongs to the technical field of magnetic material preparation, and in particular relates to a method for refining rare earth-transition group permanent magnet alloy micro / nano particles, improving their uniformity, and enhancing oxidation resistance and magnetic properties. Background technique [0002] Rare earth-transition group permanent magnet alloy micro / nanoparticles, such as commonly used rare earth iron series, rare earth cobalt series, and permanent magnetic alloy micro / nanoparticles containing other doping elements, etc., are used in the preparation of high-performance rare earth permanent magnet materials, new A generation of nano-two-phase composite permanent magnet materials, ultra-high-density magnetic recording materials, ferrofluids, etc. have important research and application backgrounds. [0003] Currently, methods for preparing rare earth-transition group permanent magnetic alloy particles include direct ball milling...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22F9/04H01F1/057
CPCB22F9/04B22F2009/043H01F1/0571
Inventor 王芳张健安小鑫杜娟夏卫星刘平闫阿儒
Owner NINGBO INST OF MATERIALS TECH & ENG CHINESE ACADEMY OF SCI