Method for preparing neodymium-iron-boron permanent magnetic alloy powder by water/oil flow grinding

A permanent magnet alloy and NdFeB technology, which is applied in the field of NdFeB permanent magnet alloy powder preparation by water/oil flow milling, can solve the problems of poor pressing performance of alloy powder and affecting the magnetic properties of the final magnet, and achieve Improve the crushing effect and efficiency, and the effect of good crushing effect

Active Publication Date: 2015-04-08
UNIV OF SCI & TECH BEIJING
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The surface shape of the NdFeB alloy powder prepared by the above-mentioned plasma melting and atomization method is mostly spherical, which leads to poor compression molding performance of the alloy powder and affects the magnetic properties of the final magnet.

Method used

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  • Method for preparing neodymium-iron-boron permanent magnetic alloy powder by water/oil flow grinding
  • Method for preparing neodymium-iron-boron permanent magnetic alloy powder by water/oil flow grinding

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] Example 1 Preparation of Nd by high pressure pulsed water jet 29.7 Dy 1.3 Fe 68.0 B 1.0 alloy powder

[0030] The NdFeB alloy is smelted by vacuum induction, and its atomic composition is Nd 29.7 Dy 1.3 Fe 68.0 B 1.0 ; The alloy ingot is subjected to vacuum annealing treatment, the annealing temperature is 950 ~ 1050 ℃, the time is 8 ~ 16h; the NdFeB alloy ingot is broken into small ingots of 10 ~ 30mm with a press, and placed in a hydrogen explosion device In the stainless steel pressure tank, the pressure tank is evacuated to 1.0 ~ 2.0 × 10 -3 Pa, feed high-purity hydrogen to 0.1-1.5MPa, and keep the temperature for 30-50min to obtain hydrogen-absorbing Nd with an average particle size of 100-300μm 29.7 Dy 1.3 Fe 68.0 B 1.0 Alloy powder; 100MPa high-pressure passivation water jet passes through the jet cut-off orifice plate (rotation speed 900rpm) to form a pulse jet, and the hydrogen-absorbing Nd in the feeding device is discharged. 29.7 Dy 1.3 Fe 68.0 ...

Embodiment 2

[0031] Example 2 Preparation of Nd by high pressure pulsed water jet 29.0 Pr 0.6 Dy 0.5 Fe 68.5 Ga 0.4 B 1.0 alloy powder

[0032] The NdFeB alloy is smelted by vacuum induction, and its atomic composition is Nd 29.0 Pr 0.6 Dy 0.5 Fe 68.5 Ga 0.4 B 1.0 ;Preparation of Nd with a thickness of about 0.4mm for quick-setting cast sheets (SC sheets) 29.0 Pr 0.6 Dy 0.5 Fe 68.5 Ga 0.4 B 1.0 Alloy casting; Nd 29.0 Pr 0.6 Dy 0.5 Fe 68.5 Ga 0.4 B 1.0 Alloy cast sheet SC sheet is placed in the stainless steel pressure tank of the hydrogen explosion device, and the pressure tank is evacuated to 1.0 ~ 2.0 × 10 -3 Pa, feed high-purity hydrogen to 0.2-1.6 MPa, and keep the temperature for 30-60 min to obtain hydrogen-absorbing Nd with an average particle size of 70-160 μm 29.0 Pr 0.6 Dy 0.5 Fe 68.5 Ga 0.4 B 1.0 Alloy powder; 80MPa high-pressure oil (No. 120 gasoline) jet flows through the jet cut-off orifice plate (speed 1020rpm) to form a pulse jet, which removes t...

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Abstract

The invention relates to a method for preparing neodymium-iron-boron permanent magnetic alloy powder by water/oil flow grinding. The method includes: taking hydrogen absorption neodymium-iron-boron particles as raw materials, and crushing the hydrogen absorption neodymium-iron-boron particles under water hammer action of high-pressure pulse water jet, water wedge stretch action, friction shearing action, strong impact action between particles and targets, grinding action between particles and grinding media and the like to finally prepare neodymium-iron-boron alloy powder proper in granularity. The method has the advantages that powder preparation is realized by high-pressure pulse water/oil flow jet, impact force for crushing the particles is greatly increased by the water hammer action of high-pressure pulse water jet, the water wedge stretch action, the shearing action, the strong impact action between particles and targets and the like besides high-speed collision among particles, and effectiveness and efficiency in crushing are improved; oxygen content of alloy powder is effectively reduced by adoption of passivated water or oil.

Description

technical field [0001] The invention belongs to the field of magnetic materials, and relates to a preparation method of NdFeB permanent magnet alloy powder prepared by water / oil flow mill. Background technique [0002] NdFeB rare earth permanent magnet alloys are increasingly used for their excellent magnetic properties, and are widely used in medical MRI, computer hard drives, audio, mobile phones, etc. With the requirements of energy saving and low-carbon economy , NdFeB rare earth permanent magnet alloys have begun to be used in auto parts, household appliances, energy-saving and control motors, hybrid vehicles, wind power and other fields. As of 2011, the actual output of rare earth NdFeB permanent magnets in my country has exceeded 100,000 tons, and the achievable output has reached 150,000-200,000 tons, ranking first in the world. However, most of the permanent magnet materials produced in my country are low-end products. , we can only rely on cheap labor and low commo...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22F9/04
Inventor 李纪恒高学绪包小倩汤明辉
Owner UNIV OF SCI & TECH BEIJING
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