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Method for preparing high-coercive-force neodymium magnet through grain boundary diffusion under constant magnetic field

A technology of high coercive force and grain boundary diffusion, which is applied in the direction of magnetic objects, inductor/transformer/magnet manufacturing, magnetic materials, etc., can solve the problems of high production cost of Nd-Fe-B permanent magnetic materials and achieve high coercivity Force, the effect of improving grain boundary characteristics

Inactive Publication Date: 2018-11-16
CHINA JILIANG UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, due to the continuous rise of rare earth prices in recent years, the production cost of Nd-Fe-B permanent magnet materials has increased significantly, and the development of new low-cost rare earth permanent magnet materials has become one of the current research hotspots.

Method used

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  • Method for preparing high-coercive-force neodymium magnet through grain boundary diffusion under constant magnetic field

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] 1) Weigh and mix the raw materials according to the composition of the NdFeB alloy, vacuum melt the mixed raw materials, and then quickly quench and throw the strips to make alloy thin strips; the composition and mass percentage of the NdFeB alloy are: Nd: 31%, Fe : 66.8%, B: 1.2%, Zr: 0.4%, Co: 0.6%; the quick quenching speed of the described quick quenching strip is 25m / s;

[0019] 2) The low melting point rare earth ternary Ce 50 Al 25 Cu 25 The alloy is weighed and proportioned by atomic percentage, then the mixed raw materials are vacuum smelted, and then the alloy thin strip is made into a quick quenching strip; the rapid quenching speed of the quick quenching strip is 15m / s;

[0020] 3) The Ce prepared in step 2) 50 Al 25 Cu 25 Homogeneous low melting point rare earth ternary Ce 50 Al 25 Cu 25 Nano powder;

[0021] 4) The low melting point rare earth ternary Ce prepared in step 3) 50 Al 25 Cu 25 Nano-powder coating the free surface and quenched surfac...

Embodiment 2

[0026] 1) Weigh and mix the raw materials according to the composition of the NdFeB alloy, vacuum melt the mixed raw materials, and then quickly quench and throw the strips to make alloy thin strips; the composition and mass percentage of the NdFeB alloy are: Nd: 32%, Fe : 65.2%, B: 1.4%, Zr: 0.6%, Co: 0.8%; the quick quenching speed of the described quick quenching strip is 28m / s;

[0027] 2) The low melting point rare earth ternary La 50 Al 25 Cu 25 The alloy is weighed and proportioned by atomic percentage, and then the mixed raw materials are vacuum smelted, and then the alloy thin strip is made into a rapid quenching strip; the rapid quenching speed of the rapid quenching strip is 20m / s;

[0028] 3) The La prepared in step 2) 50 Al 25 Cu 25 After the ribbon is milled by high-energy ball, a uniform low-melting point rare earth ternary La 50 Al 25 Cu 25 Nano powder;

[0029] 4) The low melting point rare earth ternary La 50 Al 25 Cu 25 Nano-powder coating the fr...

Embodiment 3

[0034] 1) Weigh and mix the raw materials according to the composition of the NdFeB alloy, vacuum melt the mixed raw materials, and then quickly quench and throw the strips to make alloy thin strips; the composition and mass percentage of the NdFeB alloy are: Nd: 33%, Fe : 63.4%, B: 1.8%, Zr: 0.8%, Co: 1.0%; the quick quenching speed of the described quick quenching strip is 28m / s;

[0035] 2) The low melting point rare earth ternary Pr 50 Al 25 Cu 25 The alloy is weighed and proportioned by atomic percentage, and then the mixed raw materials are vacuum smelted, and then the alloy thin strip is made into a rapid quenching strip; the rapid quenching speed of the rapid quenching strip is 20m / s;

[0036] 3) The Pr prepared in step 2) 50 Al 25 Cu 25 After the thin ribbon is milled by high-energy ball, a uniform low-melting point rare earth ternary Pr 50 Al 25 Cu 25 Nano powder;

[0037]4) The low melting point rare earth ternary Pr prepared in step 3) 50 Al 25 Cu 25 Na...

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Abstract

The invention discloses a method for preparing a high-coercive-force neodymium magnet through grain boundary diffusion under a constant magnetic field. The method comprises the steps that material preparation is conducted according to NdFeB alloy components, an alloy ingot is obtained through vacuum melting, and the alloy ingot is rapidly quenched to be a strip; material preparation is conducted according to rare earth ternary Re-Al-Cu alloy components, a mother alloy ingot is obtained through vacuum melting, the mother alloy ingot is rapidly quenched to be a strip, and high-energy ball milling is conducted to obtain uniform low-melting-point rare earth ternary Re-Al-Cu nano powder; the free surface and rapid cooling surface of the NdFeB alloy strip are coated with the Re-Al-Cu nano powder; the strip alloy is parallel placed in a constant magnetic field annealing furnace with the magnetic field strength of 1.5T to perform vacuum magnetic field heat processing. According to the method,the low-melting-point rare earth ternary Re-Al-Cu nano alloy is taken as a diffusion source, diffusion heat processing is conducted on the NdFeB alloy under the action of the thermal magnetic field tomake hard magnetic phases in the NdFeB alloy to be arranged along an easy axis of magnetization, and therefore the grain characteristics of the diffused neodymium magnet is improved.

Description

technical field [0001] The invention relates to the technical field of magnetic materials, in particular to a method for preparing a high-coercivity neodymium-iron-boron magnet by grain boundary diffusion under a constant magnetic field. Background technique [0002] Since its inception, NdFeB permanent magnet materials have been widely used in many fields because of their high remanence, coercive force and maximum energy product. However, due to the continuous rise of rare earth prices in recent years, the production cost of Nd-Fe-B permanent magnet materials has increased significantly, and the development of new low-cost rare earth permanent magnet materials has become one of the current research hotspots. There are generally two ideas for developing a new generation of high-performance, low-cost rare earth permanent magnet materials: one is to develop composite permanent magnet materials, making full use of the high saturation magnetization of soft magnetic materials and...

Claims

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Application Information

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IPC IPC(8): H01F1/057H01F41/02
CPCH01F41/0293H01F1/0571
Inventor 吴琼黄益红葛洪良吴中平泮敏翔
Owner CHINA JILIANG UNIV
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