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A kind of manufacturing method of intensive sintered NdFeB permanent magnet

A manufacturing method, NdFeB technology, applied in the direction of inductance/transformer/magnet manufacturing, magnetic objects, magnetic materials, etc., can solve problems affecting magnetic properties, surface corrosion, etc., and achieve the effect of reducing the use of rare earths

Active Publication Date: 2020-04-24
TIANJIN SANHUAN LUCKY NEW MATERIAL CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Dysprosium infiltrated NdFeB permanent magnets are mainly concentrated on the surface, and the surface of the sample will be rusted during transportation or storage in the air, which will affect the magnetic properties.

Method used

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  • A kind of manufacturing method of intensive sintered NdFeB permanent magnet

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0016] NdFeB permanent magnets are prepared into quick-setting flakes by using a vacuum induction quick-setting casting furnace, and the roll speed is controlled at 1m / s, and the thickness of the flakes is 0.3mm; the above-mentioned quick-setting flakes are crushed by hydrogen explosion and dehydrogenated. ; Utilize the speed of high-speed airflow in the jet mill to be 1.7 times the sonic inert gas flow (argon) to crush the powder after the hydrogen explosion, and make a micropowder with an average particle size of 2 μm; The mold is loaded in the atmosphere, the mold is high temperature resistant carbon, and the powder filling density range is 2g / cm3.

[0017] Place the mold containing the micropowder in a 3T pulsed magnetic field under the protection of argon inert gas for orientation, and the orientation sequence is positive and negative, thereby making a green magnet; under the protection of argon inert gas, place the green magnet in a vacuum In the sintering furnace, vacuu...

Embodiment 2

[0020] NdFeB permanent magnets are prepared into quick-setting flakes by using a vacuum induction quick-setting casting furnace, and the roll speed is controlled at 5m / s, and the thickness of the flakes is 0.1mm; the above-mentioned quick-setting flakes are crushed by hydrogen explosion and dehydrogenated. ; Utilize the speed of the high-speed airflow in the jet mill to be 1.3 times the sonic inert gas flow (argon) to crush the powder after the hydrogen explosion and make a micropowder with an average particle size of 5 μm; The mold is loaded in the atmosphere, the mold is high temperature resistant graphite, and the range of powder filling density is 4g / cm3.

[0021] Place the mold containing the micropowder in a 3T pulsed magnetic field under the protection of argon inert gas for orientation, and the orientation sequence is positive and negative, thereby making a green magnet; under the protection of argon inert gas, place the green magnet in a vacuum In the sintering furnac...

Embodiment 3

[0024]NdFeB permanent magnets are prepared into quick-setting flakes by using a vacuum induction quick-setting casting furnace, and the roll speed is controlled at 3m / s, and the thickness of the flakes is 0.2mm; the above-mentioned quick-setting flakes are crushed by hydrogen explosion and dehydrogenated. ; Utilize the speed of the high-speed airflow in the jet mill to be 1.5 times the sonic inert gas flow (argon) to crush the powder after the hydrogen explosion and make a micropowder with an average particle size of 4 μm; Load the mold in the atmosphere, the mold is high temperature resistant graphite, and the powder filling density range is 3g / cm3.

[0025] Place the mold containing the micropowder in a 3T pulsed magnetic field under the protection of argon inert gas for orientation, and the orientation sequence is positive and negative, thereby making a green magnet; under the protection of argon inert gas, place the green magnet in a vacuum In the sintering furnace, vacuum...

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Abstract

The present invention provides a manufacturing method of an intensively sintered NdFeB permanent magnet. The manufacturing method comprises the steps of preparing a NdFeB permanent magnet into rapidly solidified strips by utilization of a vacuum induction rapidly solidified casting strip furnace, performing hydrogen explosion crushing on the rapidly solidified strips and performing dehydrogenation, crushing powder after hydrogen explosion crushing by utilization of high-speed inert gas flow in an airflow mill and preparing micro powder having an average particle size of 1-5 [mum], and sintering to obtain a high-performance NdFeB permanent magnet material after performing orientation and compression on the micro powder. By means of performing magnetron sputtering twice, magnetic performance and corrosion resistant performance of the NdFeB permanent magnet can be effectively improved, and service lifetime of the NdFeB permanent magnet can be prolonged.

Description

technical field [0001] The invention relates to a production method of an NdFeB permanent magnet, in particular to a production method of an intensive sintered NdFeB permanent magnet. Background technique [0002] Neodymium iron boron (NdFeB) permanent magnet material is the rare earth permanent magnet material with the highest magnetic performance at present, known as the "magnet king". It has been widely used in many fields such as electroplating devices, machinery, medical treatment, automobiles, etc., and has a very broad prospect. There are many methods for preparing NdFeB permanent magnet materials, such as (CN201310416673) a method for preparing low-dysprosium corrosion-resistant sintered NdFeB, which is characterized in that it includes the following steps: Step 1. Prepare a master alloy ingot, the atomic percentage of which is: Nd:9.0 -13.5%, Pr: 0-3.0%, Fe: 80.2-81.5%, B: 6.3-6.7%, the rest are unavoidable impurities, and the master alloy quick-setting casting is ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01F41/02H01F1/057H01F1/08
Inventor 白晓刚潘广麾李大军
Owner TIANJIN SANHUAN LUCKY NEW MATERIAL CO LTD
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