Micro-powder for preparing neodymium-iron-boron permanent magnet material, target type air-current powder milling method and milled powder

A permanent magnet material, NdFeB technology, used in magnetic materials, electrical components, magnetic objects, etc., can solve the problems of high price of helium, high specific gravity of ultrafine powder, slow powder extraction rate, etc., to achieve high consistency, The effect of low particle attachment rate and improved productivity

Active Publication Date: 2018-06-29
SANVAC BEIJING MAGNETICS +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, hydrogen and oxygen are explosive gases, and helium can make the particle size of magnetic powder smaller, but the specific gravity of ultra-fine powder is large, the powder extraction rate is slow, and helium is expensive

Method used

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  • Micro-powder for preparing neodymium-iron-boron permanent magnet material, target type air-current powder milling method and milled powder
  • Micro-powder for preparing neodymium-iron-boron permanent magnet material, target type air-current powder milling method and milled powder
  • Micro-powder for preparing neodymium-iron-boron permanent magnet material, target type air-current powder milling method and milled powder

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0049] The Nd-Fe-B alloy ingot is prepared into a strip sheet with an average thickness of 0.32mm by the quick-setting thin sheet method, and its composition is Nd 31 Dy 1 co 1 Cu 0.1 Zr 0.08 Ga 0.12 Al 0.1 Nb 0.3 Fe bal B 0.97 (wt.%, for mass percentage). The NdFeB quick-setting thin strips are crushed by the HD method to obtain coarse powder. Add 0.05wt% lubricant to the coarse powder and mix through a powder mixer. The mixed powder is ultrafinely crushed by a target jet mill. The grinding pressure is 0.6MPa, the jet mill nozzle and the target material are all made of silicon nitride Laval nozzle, the formula of the target diameter, the side nozzle diameter, and the distance between the target and the side nozzle is m=3, and the jet air velocity is 400m / s. At the same time, the ceramic classifying wheel is selected, and in the formula of its diameter and the target diameter, p=4. The final powder output is divided into two parts. The qualified micro powder accoun...

Embodiment 2

[0057] The NdFeB alloy ingot is prepared into a strip sheet with an average thickness of 0.1mm by the quick-setting thin sheet method, and its composition is (PrNd) 30.8 co 0.5 Cu 0.06 Zr 0.10 Ga 0.10 Al 0.3 Nb 0.3 Fe bal B 0.94 (wt.%, for mass percentage). The NdFeB quick-setting thin strips are crushed by the HD method to obtain coarse powder. Add 0.5wt% lubricant to the coarse powder and mix through a powder mixer. The mixed powder is ultrafinely crushed by a target jet mill. The grinding pressure is 0.3MPa, the jet mill nozzle and the target material are all made of silicon nitride Laval nozzle, the formula of the target diameter, the side nozzle diameter, and the distance between the target and the side nozzle is m=2, and the jet air velocity is 520m / s. At the same time, the ceramic grading wheel is selected, and in the formula of its diameter and the diameter of the bull's-eye, p=3.5. The final powder output is divided into two parts. The qualified micro powde...

Embodiment 3

[0065] The NdFeB alloy ingot is prepared into a strip sheet with an average thickness of 0.4mm by the quick-setting thin sheet method, and its composition is (PrNd) 26 Dy 5 co 1.3 Cu 0.15 Zr 0.08 Ga 0.16 Al 0.25 Fe bal B 0.97 (wt.%, for mass percentage). The NdFeB quick-setting thin strips are crushed by the HD method to obtain coarse powder. Add 0.3wt% lubricant to the coarse powder and mix through a powder mixer. The mixed powder is ultrafinely crushed by a target jet mill. The grinding pressure is 0.8MPa, the jet mill nozzle and the target material are all made of silicon nitride Laval nozzle, the formula of the target diameter, the side nozzle diameter, and the distance between the target and the side nozzle is m=5, and the jet air velocity is 320m / s. At the same time, the ceramic grading wheel is selected, and in the formula of its diameter and the target diameter, p=4.5. The final powder output is divided into two parts. The qualified micro powder accounts for...

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Abstract

The invention discloses a kind of micro-powder for preparing a neodymium-iron-boron permanent magnet material, a target type air-current powder milling method adopted for preparing the micro-powder and the powder milled from an air-current mill. The sphericity degree of the micro-powder is greater than or equal to 90%, and the particle adhesive rate of the micro-powder is less than or equal to 10%. According to the target type air-current powder milling method, the relation of the diameter A of a target center, the diameter B of a side nozzle and the distance C between the target center and the side nozzle is A / B=m*(C / A+B), wherein the value range of m is 1-7, and the jet stream speed of the side nozzle is 320-580 m / s. The relation of the diameter F of a grading wheel and the diameter A ofthe target center is F=p*A, wherein the value range of p is 3-6. The air-current milled powder obtained through the method comprises ultrafine powder and the micro-powder, wherein the ratio of the mass of the ultrafine powder to the total mass of the air-current milled powder is less than or equal to 0.5%. The micro-powder provided by the invention is uniform in particle size distribution, narrowin range, low in nitrogen content and suitable for large-scale production of the high-quality sintered neodymium-iron-boron permanent magnet material. The milled powder obtained through the target type air-current powder milling method does not contain spit materials. The subsequent process is omitted.

Description

technical field [0001] The invention relates to the preparation of micropowder of sintered NdFeB permanent magnet material, a target-type airflow milling method for preparing the micropowder, and the airflow milling powder obtained by the method. Background technique [0002] with R 2 T 14 The sintered NdFeB composite material with B as the main phase has the characteristics of high magnetic properties, relatively low price, and easy processing. It is widely used in many national pillar industries such as energy, communication, transportation, national defense, and medical equipment. Huge market demand. At present, the powder metallurgy method is generally used to prepare sintered NdFeB materials, and its final magnetic properties are largely determined by the quality of the powder before pressing. Among them, the particle size distribution of the powder is the key factor affecting the coercive force and magnetization behavior of the magnet. In modern industrial producti...

Claims

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Application Information

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IPC IPC(8): B22F1/00B22F9/04H01F1/057B22F1/052B22F1/065
CPCH01F1/0571B22F9/04B22F2009/044B22F1/065B22F1/052B22F1/00B22F2999/00B02C19/06B02C23/10B22F2201/02B22F2301/355B22F2304/10
Inventor 陈国安方彬孙立柏赵玉刚
Owner SANVAC BEIJING MAGNETICS
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