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Low-cost diffusion source alloy, grain boundary diffusion magnet and preparation method thereof

A technology of grain boundary diffusion and diffusion source, applied in magnetic objects, inductance/transformer/magnet manufacturing, magnetic materials, etc., to achieve the effect of reducing raw material cost and improving cost performance

Inactive Publication Date: 2018-08-17
CENT IRON & STEEL RES INST
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in the current diffusion source alloy, the content of heavy rare earth elements is relatively high, and the cost of the diffusion source alloy can be further reduced

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0056] Preparation of diffusion source alloy:

[0057] Using electric arc furnace to smelt diffusion source alloy Ce 5 Pr 7 Nd 28 Tb 30 Cu 20 Al 10 (Atomic percentage), the alloy ingot is prepared, the alloy ingot is roughly crushed, and then hydrogen is broken under the hydrogen pressure of 0.4 MPa, and finally ball milled under the protection of ethanol for 24 hours to obtain the diffusion source alloy slurry.

[0058] Among them, the mass ratio of ethanol to alloy is 1:1.

[0059] Preparation of grain boundary diffusion magnet:

[0060] (1) Cut the neodymium iron boron magnet (original magnet) into a cylinder of Φ10mm*5mm.

[0061] (2) Clean the oil stains on the surface of the neodymium iron boron magnet, and polish off the oxide layer on the surface of the neodymium iron boron magnet with sandpaper.

[0062] (3) The cylindrical magnet is immersed in the diffusion source alloy slurry, taken out and dried in a glove box, to obtain an attached diffusion source alloy powder magnet.

[00...

Embodiment 2

[0070] Preparation of diffusion source alloy:

[0071] Using electric arc furnace to smelt diffusion source alloy Ce 0.1 Pr 80 Tb 10 Dy 4.9 Cu 2.5 Al 2.5 (Atomic percentage), the alloy ingot is prepared, the alloy ingot is roughly crushed, and then hydrogen is broken under the hydrogen pressure of 0.4 MPa, and finally ball milled under the protection of ethanol for 24 hours to obtain the diffusion source alloy slurry.

[0072] Among them, the mass ratio of ethanol to alloy is 1:1.

[0073] Preparation of grain boundary diffusion magnet:

[0074] (1) Cut the cerium magnet (original magnet) into a cylinder of Φ10mm*5mm.

[0075] (2) Clean the oil stains on the surface, and polish off the oxide layer on the surface with sandpaper.

[0076] (3) The cylindrical magnet is immersed in the alloy slurry, taken out and dried in a glove box to obtain a magnet with attached alloy powder.

[0077] (4) The adhered alloy powder magnet was subjected to diffusion treatment at 980°C for 10 hours and then t...

Embodiment 3

[0084] Preparation of diffusion source alloy:

[0085] Using electric arc furnace to smelt diffusion source alloy Ce 20 Dy 56 Cu 12 Al 12 (Atomic percentage), the alloy ingot is prepared, the alloy ingot is roughly crushed, and then hydrogen is broken under the hydrogen pressure of 0.4 MPa, and finally ball milled under the protection of ethanol for 24 hours to obtain the diffusion source alloy slurry.

[0086] Among them, the mass ratio of ethanol to alloy is 1:1.

[0087] Preparation of grain boundary diffusion magnet:

[0088] (1) Cut the cerium magnet (original magnet) into a cylinder of Φ10mm*5mm.

[0089] (2) Clean the oil stains on the surface, and polish off the oxide layer on the surface with sandpaper.

[0090] (3) The cylindrical magnet is immersed in the alloy slurry, taken out and dried in a glove box to obtain a magnet with attached alloy powder.

[0091] (4) Diffusion treatment of the attached alloy powder magnet at 940°C for 4h.

[0092] (5) The diffusion treated magnet was...

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Abstract

The invention relates to low-cost diffusion source alloy for magnet grain boundary diffusion, a grain boundary diffusion magnet and a preparation method thereof. Chemical components of the diffusion source alloy comprise an element Ce, a light rare earth element LRE, a heavy rare earth element HRE and a metal element M, and are shown as Cex(LREaHRE1-a)yM100-x-y according to atomic percentage, wherein 0< x< / = 20, 15< / = y< / = 99.9 and 15<x+ y< / = 99.9, 0< / = a< / = 1.0; LRE is one or more of La, Pr, Nd and Y; HRE is one or more of Tb, Dy and Ho; and M is one or more of Al, Cu, Zn, Ga, Ag, Pb, Bi andSn. The light rare earth element, particularly cerium, is used for partially replacing a heavy rare earth element, raw material costs of the diffusion source alloy is reduced, the melting point of thediffusion source alloy is adjusted, by improvement of the diffusion efficiency of the heavy rare earth element, the coercivity temperature coefficient of the grain boundary diffusion magnet is increased, and the high-temperature stability of the grain boundary diffusion magnet is improved.

Description

Technical field [0001] The invention relates to the field of rare earth permanent magnet materials, and relates to a low-cost diffusion source alloy used for magnet grain boundary diffusion, a grain boundary diffusion magnet and a preparation method thereof. Background technique [0002] NdFeB permanent magnet materials are widely used in the fields of electromechanics, information, robotics and intelligent manufacturing due to their excellent comprehensive magnetic properties. However, ordinary non-heavy rare earth sintered NdFeB magnets have low Curie temperature and poor high-temperature magnetic properties, which cannot meet the requirements of (hybrid) electric vehicle traction motors and wind energy generators under high temperature conditions, which limits the application of magnets range. [0003] The traditional method to solve this problem is master alloy smelting and adding heavy rare earth elements Dy and Tb or adding heavy rare earth elements Dy and Tb fluorides, hydr...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01F41/02H01F1/057
CPCH01F1/057H01F41/0293
Inventor 冯海波谭敏李安华陈鑫烁陈红升李卫
Owner CENT IRON & STEEL RES INST
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