Method for improving coercive force of neodymium iron boron quick-quenching nanocrystalline magnetic powder

A nanocrystalline, NdFeB technology, applied in the direction of magnetic materials, magnetic objects, electrical components, etc., can solve the problems such as the inability to effectively improve the coercive force of magnets, waste of resources, and poor results.

Active Publication Date: 2015-06-17
BEIJING ZHONG KE SAN HUAN HI TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the effect of coercive force enhancement is not good, probably because there is no continuous non-magnetic phase formed between the grains to play a magnetic i...

Method used

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  • Method for improving coercive force of neodymium iron boron quick-quenching nanocrystalline magnetic powder
  • Method for improving coercive force of neodymium iron boron quick-quenching nanocrystalline magnetic powder

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Experimental program
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Effect test

Embodiment 1

[0032] The nominal composition (atomic percentage) of the low melting point alloy used is Nd 70 Cu 30 , Alloy ingots were prepared by vacuum arc melting. The protective gas is high-purity argon, and the front and back are smelted four times.

[0033] The alloy ingot is put into a disc mill for disc grinding for 10 minutes to obtain alloy powder.

[0034] The disc-milled alloy powder was put into a gasoline-protected planetary ball mill jar and ball-milled for 100 minutes to obtain alloy powder, which was then vacuum-dried.

[0035] Mix the dried alloy powder with absolute ethanol at a mixing weight ratio of 1:4, and stir thoroughly to form a suspension.

[0036] The nominal composition (atomic percentage) of NdFeB quenching powder is Nd 11.8 Dy 0.5 Fe 79.7 Zr 0.8 Nb 0.8 Cu 0.4 B 6 , with an average particle size of 300 microns. Mix the NdFeB quick-quenching powder with the above-mentioned suspension, and stir thoroughly to make the NdFeB quick-quenching powder fully...

Embodiment 2

[0040] The nominal composition (atomic percentage) of the low melting point alloy used is Nd 70 Cu 30 , the alloy ingot was prepared by vacuum arc melting, the protective gas was high-purity argon, and the reverse side was smelted four times.

[0041] Put the alloy ingot into the disc mill, and disc mill for 10 minutes.

[0042] The disc-milled alloy powder was ball-milled for 100 minutes in a gasoline-protected planetary ball mill jar to obtain alloy powder, and then the powder was dried.

[0043] Mix the dried powder with absolute ethanol at a mixing weight ratio of 1:4, stir well to form a suspension.

[0044] Mix the same NdFeB quick-quenching powder as in Example 1 with the suspension, and stir thoroughly to make the NdFeB quick-quenching powder fully contact with the particles in the suspension. Then use a 300-mesh sieve to filter out the NdFeB quick-quenching powder, and dry it in a vacuum environment.

[0045]The above-mentioned dried NdFeB quick-quenching powder i...

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Abstract

The invention provides a method for improving coercive force of neodymium iron boron quick-quenching nanocrystalline magnetic powder. The method comprises the following steps that a, powder suspension liquid with low-melting-point alloy is prepared, and the weight ratio of the powder to a solvent is 1:1 to 1:10; b, the neodymium iron boron quick-quenching nanocrystalline magnetic powder prepared through a common method and the suspension liquid are mixed to be fully stirred, the powder in the suspension liquid evenly covers the particle periphery of the neodymium iron boron quick-quenching nanocrystalline magnetic powder, and the neodymium iron boron quick-quenching nanocrystalline magnetic powder is filtered out and dried in a vacuum manner; c, under the vacuum or atmosphere condition, heat treatment is carried out on the neodymium iron boron quick-quenching nanocrystalline magnetic powder treated in the step b, and the heat treatment is carried out for 5 minutes to 30 minutes at the temperature of 500 DEG C to 800 DEG C; and d, water quenching or oil quenching rapid cooling treatment is carried out on the neodymium iron boron quick-quenching nanocrystalline magnetic powder obtained after heat treatment. Through the method, the coercive force of the obtained magnetic powder is improved, and magnetizing becomes easy.

Description

technical field [0001] The invention relates to a method for improving the coercive force of NdFeB quick-quenching nanocrystalline magnetic powder. Background technique [0002] The NdFeB quick-quenching nanocrystalline permanent magnet alloy is composed of isotropic grains with a three-dimensional size of less than 100nm. Due to the small grain size, there is more room for its coercive force to be improved. Grain refinement is one of the effective means to improve the coercive force of nanocrystalline magnets. The more popular method is to add trace amounts of high melting point alloy elements such as Nb, Ti, Zr, etc. during the smelting process, and use these elements at the grain boundary. Enrichment inhibits the growth of grains and improves the coercive force. [0003] However, since the coercive force of bonded NdFeB products is controlled by the pinning field, the grain size decreases, the total amount of grain boundaries increases, and the pinning field increases ac...

Claims

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Application Information

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IPC IPC(8): B22F1/00H01F1/057
Inventor 陈治安钮萼蔡道炎敖学如饶晓雷胡伯平
Owner BEIJING ZHONG KE SAN HUAN HI TECH
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