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Heat-resisting oxidation-resistance nitrogen-containing anisotropic rare earth permanent magnet alloy powder and preparation thereof

An anisotropic, rare-earth permanent magnet technology, applied in the direction of magnetic materials, magnetic objects, inorganic materials, etc., can solve the problem of decreased magnetic performance, small amplitude reduction of anisotropy field, reduction of saturation magnetization and anisotropy field and other problems, to achieve the effect of good anti-oxidation performance, low oxygen content and high service temperature

Inactive Publication Date: 2008-08-13
GRIREM ADVANCED MATERIALS CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Later scholars believed that nitrogen atoms entered the crystal lattice, and the volume expanded. Although the Curie temperature was increased, the saturation magnetization and anisotropy field were also reduced, resulting in a decrease in magnetic properties.
However, according to the obtained experimental data, after nitrogen atoms enter the lattice gap, the reduction amplitude of the saturation magnetization and anisotropy field is very small, and how much such a small change can have on the overall performance of the material. Not yet reported
Patents US5114502, US5122203, US5244510, and US5266128 believe that pure nitrogen or nitrogen-containing gas is used to passivate the powder, and the oxidation resistance and corrosion resistance of the powder are improved by forming a nitride film on the surface of the powder, but nitrogen is not involved Interstitial Atom Effects of Atoms in Compounds

Method used

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  • Heat-resisting oxidation-resistance nitrogen-containing anisotropic rare earth permanent magnet alloy powder and preparation thereof
  • Heat-resisting oxidation-resistance nitrogen-containing anisotropic rare earth permanent magnet alloy powder and preparation thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] A thin plate-shaped alloy ingot with a composition of 20Nd7.8Pr1.2Dy66.7Fe1.5Co1.5Ga0.25Nb1.05B is broken into small pieces of alloy in a jaw crusher under the protection of an inert gas, and then placed in a hydrogenation furnace. Vacuum down to 1×10 -3 Pa, and then feed 0.2MPa high-purity hydrogen gas to make the raw material absorb hydrogen to saturation at room temperature. When the hydrogen pressure does not change significantly, the alloy material is slowly heated to 720°C and kept for 5 hours. During the whole heating process, the hydrogen pressure is continuously replenished, and the hydrogen pressure is always kept at 50KPa. Then rapidly raise the temperature to 750°C and keep it warm for 30 minutes, the hydrogen pressure is 5KPa. Then evacuate to 1×10 -3 Pa, rapidly cooled to room temperature.

[0029] Put the above-mentioned treated powder in the nitriding reaction furnace and vacuumize to 1×10 -3 After Pa, feed high-purity nitrogen with a nitrogen pressu...

Embodiment 2

[0034] The alloy rapid cooling thick strip with the composition of 20Nd7.8Pr1.2Dy66.7Fe1.5Co1.5Ga0.25Nb1.05B is broken into small pieces of alloy in a jaw crusher under the protection of inert gas, and then placed in a hydrogenation furnace. Vacuum down to 1×10 -3 Pa, and then 0.1MPa of high-purity hydrogen is introduced to make the raw material absorb hydrogen to saturation at room temperature. When the hydrogen pressure does not change significantly, the alloy material is slowly heated to 820°C and kept for 1 hour. During the whole heating process, the pressure is adjusted at any time and kept at 30KPa. Then rapidly raise the temperature to 850°C and keep it warm for 60 minutes, the hydrogen pressure is 3KPa. Then evacuate to 1×10 -3 Pa, rapidly cooled to room temperature.

[0035] Put the above-mentioned treated powder in the nitriding reaction furnace and vacuumize to 1×10 -3 After Pa, feed high-purity nitrogen with a nitrogen pressure of 1.5MPa; then heat up to 600°C ...

Embodiment 3

[0040] Under the protection of inert gas, the alloy rapid cooling thick strip with the composition of 20Nd7.8Pr1.2Dy69.26Fe0.5Al0.14Cu1.1B is broken into small pieces of alloy in a jaw crusher, and then placed in a hydrogenation furnace and vacuumized to 1×10 -3 Pa, and then 0.15MPa high-purity hydrogen gas is introduced, and heated to 400°C, so that the raw material absorbs hydrogen to saturation. When the hydrogen pressure does not change significantly, the alloy material is slowly heated up to 770°C and kept for 3 hours. During the whole heating process, the pressure is adjusted at any time and kept at 40KPa. Then rapidly raise the temperature to 800°C and keep it warm for 45 minutes, with the hydrogen pressure at 1KPa. Then evacuate to 1×10 -3 Pa, rapidly cooled to room temperature.

[0041] Put the above-mentioned treated powder in the nitriding reaction furnace and vacuumize to 1×10 -3 After Pa, feed high-purity nitrogen gas with a nitrogen pressure of 1 MPa; then he...

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Abstract

The invention provides a heat-proof oxidation resistance nitrogen-containing anisotropic rare earth permanent magnet alloy powder and a method for making same, pertaining to magnetic material preparation techniques, which is characterized in: disposing the high performance anisotropic powder formed by treating the rare earth alloy raw material with hydrogenation-dismutation-dehydrogenation-regrouping (HDDR) technique into nitrogen-containing atmosphere to be nitridized, then crushing it to produce powder with a proper granule size, which is the invented nitrogen-containing anisotropic rare earth permanent magnet alloy powder with good thermostability, excellent antioxidant ability, good magnetic property and excellent combination property. Anisotropic bonded permanent magnets made of the invented magnetic powder have characteristics of excellent antioxidant ability, high service temperature and excellent magnetic property.

Description

technical field [0001] The invention belongs to the field of rare earth permanent magnet material production, and relates to a production method of rare earth permanent magnet alloy anisotropic magnetic powder and heat-resistant and anti-oxidation anisotropic bonded magnet. Background technique [0002] Bonded rare-earth iron-boron magnets have excellent magnetic properties, mechanical properties and good processability, and have been widely used in high-tech fields such as home appliances, automobiles, computers, and medical equipment. At present, bonded rare earth iron boron magnets are divided into two types: isotropic and anisotropic magnets. The former is widely used because of its simple production process and low cost. It is mainly used in voice coil motors, hard disk drive motors and micro motors for automobiles. Medium; the production process of the latter is relatively complicated and the cost is high, but its magnetic properties are very excellent, and it is mainl...

Claims

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Application Information

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IPC IPC(8): B22F1/00B22F9/16C22C1/04H01F1/053H01F1/08H01F1/09
Inventor 李红卫于敦波李世鹏胡权霞杨红川王鹏飞
Owner GRIREM ADVANCED MATERIALS CO LTD
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