Method for preparing sintered Nd-Fe-B alloy magnetic material

A magnetic material, NdFeB technology, applied in the direction of magnetic materials, magnetic objects, inorganic materials, etc., can solve the problems of poor fluidity of NdFeB magnetic powder, affecting uniform dispersion, easy oxidation, etc., to improve the magnetic properties of products, improve Degree of powder orientation, effect of preventing oxidation

Inactive Publication Date: 2007-11-14
ZHAOQING SANHUAN JINGYUE MAGNETIC MATERIAL +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] However, after fully analyzing the production process of NdFeB magnets, it can be found that there are two problems in the production process: First, because NdFeB permanent magnet powder contains about 30% of rare earth elements, it is very easy to oxidi...

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0016] Step 1: In parts by weight, put 100 parts of NdFeB alloy powder (particle size15 h 24 o 2 , while stirring and adding, after the addition, the agitator continued to run for 30 minutes to make it evenly mixed, then packed the NdFeB coarse powder coated with antioxidants in a container, and gradually poured it into the jet mill to grind it into For powders with a particle size of 2.8-4.5 μm, at this time, a layer of anti-oxidation film is wrapped on the surface of the powder particles, which prevents the powder from contacting and reacting with oxygen, thereby reducing the oxygen content of the magnetic powder;

[0017] The second step is to put the ground NdFeB powder in a container and then pour it into the mixer. Under the protection of argon or nitrogen, add 0.02 parts of lubricant Zn (C 17 h 35 COO) 2 (above-mentioned lubricant is diluted in organic solvent by weight percentage concentration 10%, and organic solvent is by volume percentage, is made up of 60% ethan...

Embodiment 2

[0020] Step 1: In parts by weight, put 100 parts of coarsely crushed NdFeB alloy powder (particle size 15 h 24 o 2 , while stirring and adding, after the addition, the agitator continued to run for 75 minutes to make it evenly mixed, then packed the NdFeB coarse powder coated with antioxidants in a container, and gradually poured it into the jet mill to grind it into Powder with a particle size of 2.8-4.5 μm;

[0021] The second step is to put the ground NdFeB powder in a container and then pour it into the mixer. Under the protection of argon or nitrogen, add 0.05 parts of lubricant Zn(C 17 h 35 COO) 2 (above-mentioned lubricant is diluted in organic solvent by weight percentage concentration 20%, and organic solvent is by volume percentage, is made up of 50% ethanol, 30% turpentine and 20% toluene), while stirring, while adding, after adding, stirrer Continue to run for 75 minutes, stir evenly, and obtain qualified magnetic powder;

[0022]In the third step, the magneti...

Embodiment 3

[0024] Step 1: In parts by weight, put 100 parts of coarsely crushed NdFeB alloy powder (particle size 15 h 24 o 2 , while stirring and adding, after the addition, the agitator continued to run for 120 minutes to make it evenly mixed, then packed the NdFeB coarse powder coated with antioxidants in a container, and gradually poured it into the jet mill to grind it into Powder with a particle size of 2.8-4.5 μm;

[0025] The second step is to put the ground NdFeB powder in a container and then pour it into the mixer. Under the protection of argon or nitrogen, add 0.05 parts of lubricant Zn (C 17 h 35 COO) 2 (above-mentioned lubricant is diluted in organic solvent by weight percentage concentration 30%, and organic solvent is by volume percentage, is made up of 55% ethanol, 10% turpentine and 35% toluene), while stirring, while adding, after adding, agitator Continue to run for 30 minutes, stir evenly, and get qualified magnetic powder;

[0026] In the third step, the magnet...

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Abstract

This invention discloses a sintered NdFeB alloy magnetic materials preparation methods, the method is the weight of the shares in the 100 Nd-Fe-B alloy powder to add 0.01 to 0.2 in antioxidants, mixed after ground into a uniform particle size 2.8 - 4.5 mu m powder; good Nd-Fe-B powder in the mill to add 0.01 to 0.5 in the lubricant, argon or nitrogen, under the protection of uniform mixing obtained magnetic; will magnetic suppression after forming and sintering heat treatment, access to the final product . This invention in the Nd-Fe-B magnets milling through the process of adding antioxidants, in the process of accession lubricant mixture, in the suppression of the Nd-Fe-B magnetic particle forming process, the magnetic field intensity in the same circumstances raise powder orientation, thereby improving Magnetic products if the production is the same as the magnetic properties of magnets, we can reduce the forming pressure and time, so that get more capacity and reduce costs.

Description

technical field [0001] The invention relates to the technical field of preparation of sintered magnetic materials, in particular to a preparation method of a sintered NdFeB alloy magnetic material. Background technique [0002] In recent years, the average annual growth rate of NdFeB output in the world has reached 25%, and the growth rate in my country has reached 40%. Therefore, since 2001, my country has surpassed Japan and become a major producer of NdFeB magnets. In 2004, the output accounted for more than 60% of the world's total output, and it still maintains a strong growth momentum. However, compared with foreign countries, there are still many gaps in the magnet performance of rare earth permanent magnet materials in my country. Although the output of NdFeB in my country exceeds that of Japan, the output value is less than 1 / 2 of that of Japan, and the price of the product is only 1 / 3 to 1 / 2 of the international market due to the low magnetic properties of the mag...

Claims

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Application Information

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IPC IPC(8): H01F1/06H01F1/057B22F3/00
Inventor 伍尚南肖方明唐仁衡黎缓朝王英胡为坤刘岩黄莉丽
Owner ZHAOQING SANHUAN JINGYUE MAGNETIC MATERIAL
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