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A preparation method of high-performance sintered Nd-Fe-B permanent magnet material

A permanent magnet material, NdFeB technology, used in magnetic materials, inductor/transformer/magnet manufacturing, magnetic objects, etc., can solve problems such as coating, improve wettability, promote grain boundary diffusion process, reduce temperature Effect

Inactive Publication Date: 2019-01-11
UNIV OF SCI & TECH BEIJING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The main purpose of the present invention is to form a uniform and dense multi-element alloy film with adjustable thickness on the surface of the magnet, to make multiple improvements to the boundary structure of the magnet, and to solve the problem of coating the diffusion source in the industrial application of the low-melting point alloy grain boundary diffusion technology

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] Example 1 4mm thick N50 magnet surface sputtering Pr 60 Tb 10 Cu 15 A1 l5 (at.%) alloy film followed by heat treatment.

[0024] Select a commercial magnet N50 with a magnet size of Cylinder, the target composition is Pr 60 Tb 10 Cu 15 A1 l5 (at.%). The surface of the magnet is treated, the surface roughness of the pretreated magnet is Ra≤0.1μm, the surface is clean and free of oil; the cavity of the magnetron sputtering equipment is evacuated to 1×10 -3 Pa, into high-purity argon, adjust the working vacuum to 6×10 -2 Pa, the target power is 100W, the bias voltage is 100V, and the working time is 5min, the magnet to be treated is activated; then, turn on the DC power supply, bombard the surface of the target for 15min, remove the oxide layer and pollutants covered by the target surface, and bombard the target During the process, the baffle is used to block the substrate; the rare earth alloy film is deposited on the surface of the magnet by DC magnetron sputt...

Embodiment 2

[0027] Example 2 4mm thick 52M magnet surface sputtering Pr 60 Tb 10 Fe 15 Al l5 (at.%) alloy film followed by heat treatment.

[0028] Select a commercially available magnet 52M with a magnet size of Cylinder, the target composition is Pr 60 Tb 10 Fe 15 Al l5 (at.%). Surface treatment of the magnet, the surface roughness of the pretreated magnet is Ra≤0.1μm, the surface is clean and free of oil; the chamber of the magnetron sputtering equipment is evacuated to 1×10 -3 Pa, into high-purity argon, adjust the working vacuum to 6×10 -2 Pa, the sputtering power is 100W, the bias voltage is 100V, and the working time is 5min, the magnet to be treated is activated; then, the DC power is turned on, and the target surface is bombarded for 15min to remove the oxide layer and pollutants covered by the target surface. In the target process, the baffle is used to cover the substrate; the alloy film of the target composition is deposited on the surface of the magnet by DC magnet...

Embodiment 3

[0031]Example 3 4mm thick 48SH magnet surface sputtering Pr 50 Tb 20 Cu 10 Fe l5 Al 5 (at.%) alloy film followed by heat treatment.

[0032] Select a commercial magnet 48SH with a magnet size of Cylinder, the target composition is Pr 60 Tb 10 Cu 10 Fe l5 Al 5 (at.%). The surface of the magnet is treated, the surface roughness of the pretreated magnet is Ra≤0.1μm, the surface is clean and free of oil; the cavity of the magnetron sputtering equipment is evacuated to 1×10 -3 Pa, into high-purity argon, adjust the working vacuum to 6×10 -2 Pa, the target power is 100W, the bias voltage is 100V, and the working time is 5min, the magnet to be treated is activated; then, turn on the DC power supply, bombard the surface of the target for 15min, remove the oxide layer and pollutants covered by the target surface, and bombard the target In the process, the baffle is used to block the substrate; the rare earth alloy film of the target composition is deposited on the surface ...

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Abstract

The invention relates to a preparation method of a high-performance sintered Nd-Fe-B permanent magnet material, belonging to the field of rare earth permanent magnet material. The quaternary and abovequaternary rare earth alloy films are deposited on the surface of pretreated Nd-Fe-B magnet by magnetron sputtering. The homogenization, grain boundary diffusion and low temperature tempering are used as diffusion sources to improve the boundary structure of the magnet, so that the coercivity of the magnet is greatly increased and the remanence is kept basically unchanged. The composition of thequaternary and above quaternary rare earth alloy film is LRE 100-X-Y-ZHRExMyAlz (1 <= x <= 40, 1 <= y <= 20, 1 <= z <= 20), wherein LRE is one or more of the light rare earth elements such as Y, La, Ce, Pr, Nd, HRE is one or more of the heavy rare earth elements such as Tb, Dy, Ho, and M is one or more of the alloy elements such as Cu, Fe, Co, Ga, Zr, Zn, Mn, and Mg. The rare earth alloy thin filmprepared by the invention is uniform, compact and strong in adhesion as diffusion source, the quantity is continuously controllable, and the consistency of magnetic properties of the magnet after diffusion treatment is good; It can reduce the amount of rare earth and is suitable for industrial production.

Description

technical field [0001] The invention belongs to the field of rare earth permanent magnet materials, in particular to a preparation method of high-performance sintered NdFeB permanent magnet materials. Background technique [0002] Sintered neodymium iron boron (Nd-Fe-B) permanent magnets are known as the "Magnetic King" because of their excellent magnetic properties such as high remanence, coercive force and maximum energy product. With the continuous development of a new generation of information technology, high-end equipment, and new energy technologies, the requirements for Nd-Fe-B permanent magnets are getting higher and higher. [0003] Adding Dy and Tb heavy rare earth elements through direct alloying can form (Nd, Dy / Tb) with high magnetocrystalline anisotropy field in NdFeB magnets 2 Fe 14 B hardens the magnetic phase, thereby directly and effectively improving the coercive force and temperature stability of the magnet, but due to (Nd, Dy / Tb) 2 Fe 14 The antifer...

Claims

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Application Information

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IPC IPC(8): H01F41/02H01F1/057
CPCH01F1/0577H01F41/0293
Inventor 高学绪包小倩周一水卢克超汤明辉李纪恒
Owner UNIV OF SCI & TECH BEIJING
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