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Minute spherical Nd-Fe-B powder preparation method

A nd-fe-b, micro-fine technology, applied in metal processing equipment, transportation and packaging, etc., can solve the problems of complex production process and high cost, achieve the effect of shortening the process flow, good sphericity and fluidity, and reducing pollution

Inactive Publication Date: 2010-07-07
UNIV OF SCI & TECH BEIJING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The magnetic properties of sintered NdFeB are better, but the production process is more complicated and the cost is higher

Method used

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  • Minute spherical Nd-Fe-B powder preparation method

Examples

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Effect test

example 1

[0031] Example 1: Preparation of fine spherical NdFeB powder with an average particle size of 20 μm

[0032] Using hydrogen-absorbing NdFeB powder with an average particle size of 100 μm as the raw material, the stable radio frequency (RF) plasma power is 55KW, the flow rate of argon working gas is 35 slpm, the flow rate of argon protective gas is 100 slpm, and the system negative pressure is 200 mm Mercury. The hydrogen-absorbing NdFeB powder is sent into the high-temperature plasma with the argon gas with a flow rate of 5 slpm. The powder delivery rate is 50g / min. boron powder.

example 2

[0033] Example 2: Preparation of fine spherical NdFeB powder with an average particle size of 40 μm

[0034] Using hydrogen-absorbing NdFeB powder with an average particle size of 150 μm as raw material, the stable operating radio frequency (RF) plasma power is 60KW, the flow rate of argon working gas is 40 slpm, the flow rate of argon protective gas is 120 slpm, and the system negative pressure is 180 mm Mercury. The hydrogen-absorbing NdFeB powder is sent into the high-temperature plasma with the argon gas flow rate of 6 slpm, and the powder delivery rate is 60g / min. After the spheroidization treatment, the fine spherical NdFeB powder with an average particle size of 45μm can be obtained by cyclone separation. boron powder.

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Abstract

The invention provides a minute spherical Nd-Fe-B powder preparation method, belonging to the powder preparation technical field. The method combines the hydrogen decrepitation (HD) technology with the radio frequency (RF) plasma melting and spheroidizing technology, selects hydrogen absorbing Nd-Fe-B powder as the raw material, completes the steps of hydrogen decrepitation, dehydrogenization and titanium powder spheroidization of the hydrogen absorbing Nd-Fe-B powder simultaneously by plasma treatment and prepares minute spherical Nd-Fe-B powder. The invention has the advantages that the method combines the hydrogen decrepitation (HD) technology with the radio frequency (RF) plasma melting and spheroidizing technology, shortening the technological process of production, improving the production efficiency, reducing the production cost, and guaranteeing that the prepared spherical Nd-Fe-B powder has minute granularity, even ingredient, good fluidity, high sphericity and low oxygen content and meets the demand for bonding Nd-Fe-B permanent magnet in industrial production.

Description

technical field [0001] The invention belongs to the technical field of powder preparation, and in particular provides a preparation method of fine spherical NdFeB powder. technical background [0002] Rare earth permanent magnet materials have excellent magnetic properties, and Nd-Fe-B is known as the "magnet king". Since the third-generation permanent magnet Nd-Fe-B came out in the 1980s, it has developed rapidly due to its advantages of high cost performance and abundant resources. NdFeB permanent magnet materials can be divided into sintered NdFeB and bonded NdFeB, both of which have their own advantages and disadvantages. Sintered NdFeB has better magnetic properties, but the production process is more complicated and the cost is higher. Although the magnetic properties of bonded NdFeB magnets are reduced due to the addition of binders, they have many advantages such as easy mass production, precise manufacturing dimensions, large degree of shape freedom, low density, ...

Claims

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Application Information

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IPC IPC(8): B22F9/04B22F1/00B22F1/065
CPCC22C38/002B22F1/0048C22C38/005B22F2999/00C22C33/025B22F9/023B22F1/065B22F1/142B22F2202/13
Inventor 郭志猛盛艳伟曲选辉郝俊杰林涛邵慧萍罗骥
Owner UNIV OF SCI & TECH BEIJING
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