Sintered neodymium-iron-boron-based permanent magnet material with high coercive force and high corrosion resistance, prepared by doping copper nano-particles, and preparation method thereof

A copper nanoparticle, high coercivity technology, applied in the direction of magnetic materials, magnetic objects, electrical components, etc., can solve problems such as grain shedding and overall corrosion of alloys

Active Publication Date: 2012-07-04
浙江爱智机电有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Its corrosion will lead to the main phase Nd 2 Fe 14 The bonding interface between the B grains disappears, and the grains fall off, which eventually leads to the overall corrosion of the alloy

Method used

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  • Sintered neodymium-iron-boron-based permanent magnet material with high coercive force and high corrosion resistance, prepared by doping copper nano-particles, and preparation method thereof
  • Sintered neodymium-iron-boron-based permanent magnet material with high coercive force and high corrosion resistance, prepared by doping copper nano-particles, and preparation method thereof
  • Sintered neodymium-iron-boron-based permanent magnet material with high coercive force and high corrosion resistance, prepared by doping copper nano-particles, and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0014] Use quick-setting technology to change the composition to Nd 13.7 Fe bal Al 0.3 B 6 (atomic percent content) of the alloy is prepared as flakes, and then the powder is made into a powder with an average particle size of 3 microns by using a hydrogen crushing-jet milling process. Then, 0.2% by weight of Cu nano powder with an average particle size of 100 nm was added to the above-mentioned initial powder, and the two powders were uniformly mixed by a mixer. The uniformly mixed powder was oriented in a magnetic field of 2.5T and pressed into shape. Then put the compact into a high-vacuum sintering furnace, and heat up to 1120°C for sintering for 3 hours. Then carry out secondary heat treatment, wherein the temperature of the primary heat treatment is 930°C for 2 hours; the temperature of the secondary heat treatment is 580°C for 1 hour to obtain a sintered magnet.

Embodiment 2

[0022] Use quick-setting technology to change the composition to Nd 12.8 Dy 0.5 Fe bal Al 1.0 Nb0.3 B 6 (atomic percent content) of the alloy is prepared as flakes, and then the powder is made into a powder with an average particle size of 5 microns by using a hydrogen crushing-jet milling process. Afterwards, 2.5% by weight of Cu nano powder with an average particle size of 500 nm was added to the above-mentioned initial powder, and the two powders were uniformly mixed by a mixer. The uniformly mixed powder was oriented in a magnetic field of 2.5T and pressed into shape. Then put the compact into a high-vacuum sintering furnace and heat up to 1020°C for sintering for 4 hours. Then carry out secondary heat treatment, wherein the temperature of the primary heat treatment is 830°C for 3 hours, and the temperature of the secondary heat treatment is 480°C for 3 hours to obtain a sintered magnet.

Embodiment 2 and comparative example 2

[0026] Table 2 Example 2 and Comparative Example 2 magnet magnetic properties and corrosion resistance comparison

[0027]

[0028] The above results illustrate that for the same sintered NdFeB magnets with the same composition, the magnets prepared by the Cu particles with an average particle diameter of 500 nanometers of the present invention are better than those of undoped, doped with 4 microns of average particle diameter and 40 nanometers of Cu particles with an average particle diameter of 40 nanometers. The coercive force of the magnet is significantly improved, and the remanence of the magnet is equivalent to the magnetic energy product, and the corrosion resistance of the magnet is obviously improved.

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Abstract

The invention relates to a sintered neodymium-iron-boron-based permanent magnet material with high coercive force and high corrosion resistance, prepared by doping copper nano-particles, and a preparation method thereof, belonging to the technical field of magnetic materials. The preparation method comprises the following steps of: adding Cu nano-powder with average particle size of 100-500nm into neodymium-iron-boron-based powder which is of 3-5 mu m, and uniformly mixing, wherein the adding proportion of the Cu nano-powder is 0.2-2.5% of the weight of the neodymium-iron-boron-based powder; performing orientation and press-forming in a 2.5T magnetic field; placing into a vacuum sintering furnace, then increasing the temperature to 1020-1120 DEG C for sintering for 2-4 hours, and finally performing two-stage heat treatment to get the sintered neodymium-iron-boron magnetic material, wherein the temperature of first-stage heat treatment is 830 DEG C-930 DEG C, and the time is 1-3 hours; and the temperature of second-stage heat treatment is 480 DEG C-630 DEG C and the time is 1-3 hours. The coercive force and the corrosion resistance of the neodymium-iron-boron-based permanent magnet material can be greatly improved through the process of adding the nano-Cu powder, sintering and performing the heat treatment.

Description

technical field [0001] The invention relates to a prepared neodymium-iron-boron-based permanent magnet material with high coercive force and high corrosion resistance and a preparation method thereof, belonging to the technical field of magnetic materials. Background technique [0002] NdFeB permanent magnet materials have been developed since the middle and late 1980s. They are new materials encouraged by the state. They mainly include sintered and other rare earth permanent magnet materials. They have become irreplaceable in various industries of the national economy, especially in the electronics and automobile industries. There are many kinds of basic materials, which are widely used in many fields such as electronics, automobiles, computers, electric power, machinery, energy, environmental protection, national defense, medical equipment, etc. develop. [0003] Since the emergence of NdFeB series rare earth permanent magnet materials, they have developed rapidly in just...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01F1/057B22F3/16
Inventor 刘卫强岳明孙超张东涛张久兴
Owner 浙江爱智机电有限公司
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