A high-performance nanocrystalline thermally deformed NdFeB permanent magnet and its preparation method

A thermal deformation and permanent magnet technology, which is applied in the manufacture of inductors/transformers/magnets, magnetic objects, magnetic materials, etc., can solve the problem of unsatisfactory plastic deformation ability of high melting point materials, reduction of magnet remanence and magnetic energy product, NdFeB microscopic Microstructure deterioration and other problems, to achieve the effect of inhibiting grain growth, increasing strength and hardness, and uniform structure

Active Publication Date: 2020-01-17
JIANGXI UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the remanence of the magnet decreases due to the large enrichment of the introduced low-melting nonmagnetic phase in the rare earth-rich phase
[0004] Another method is to select high melting point metals or compounds to improve the coercive force of NdFeB permanent magnets, such as the disclosed NdFeB permanent magnet material of CN106158204A, but the plastic deformation ability of this type of high melting point material is not ideal, making NdFeB permanent magnets The microstructure of boron deteriorates, resulting in a significant reduction in the remanence and energy product of the magnet, and the high melting point material is too expensive to be suitable for mass production

Method used

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  • A high-performance nanocrystalline thermally deformed NdFeB permanent magnet and its preparation method
  • A high-performance nanocrystalline thermally deformed NdFeB permanent magnet and its preparation method
  • A high-performance nanocrystalline thermally deformed NdFeB permanent magnet and its preparation method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0045] ① Select the nominal composition of the main alloy and the auxiliary alloy as Nd 13.5 Fe 76 co 4.5 Ga 0.5 B 5.5 (at%) and FeCoNi 1.25 Cu 1.25 Al 0.5 According to the nominal composition ratio, the material ratio of the two alloys is carried out respectively.

[0046] ②The prepared alloy raw material Nd 13.5 Fe 76 co 4.5 Ga 0.5 B 5.5 and FeCoNi 1.25 Cu 1.25 Al 0.5 Put them into vacuum arc melting furnace or induction melting furnace respectively, and melt them repeatedly 5 times under the protection of inert gas, so that the ingots are fully alloyed, and alloy ingots are respectively obtained after cooling.

[0047] ③ Put the obtained main alloy ingot into the quartz tube of the vacuum rapid quenching furnace after coarse crushing, and perform rapid quenching of the melt under the protection of the argon atmosphere to obtain the required rapid quenching strips. Wherein, the diameter of the nozzle of the quartz tube is 0.8mm, the distance from the roller su...

Embodiment 2

[0053] ① Select the nominal composition of the main alloy and the auxiliary alloy as Nd 13.5 Fe 76 co 4.5 Ga 0.5 B 5.5 (at%) and FeCoNi(AlSi) 0.2 According to the nominal composition ratio, the material ratio of the two alloys is carried out respectively.

[0054] ②The prepared alloy raw material Nd 13.5 Fe 76 co 4.5 Ga 0.5 B 5.5 and FeCoNi(AlSi) 0.2 Put them into vacuum arc melting furnace or induction melting furnace respectively, and melt them repeatedly 5 times under the protection of inert gas, so that the ingots are fully alloyed, and alloy ingots are respectively obtained after cooling.

[0055] ③ Put the obtained main alloy ingot into the quartz tube of the vacuum rapid quenching furnace after coarse crushing, and perform rapid quenching of the melt under the protection of the argon atmosphere to obtain the required rapid quenching strips. Wherein, the diameter of the nozzle of the quartz tube is 0.6mm, the distance from the roller surface is 2mm, and the ro...

Embodiment 3

[0061] ① Select the nominal composition of the main alloy and the auxiliary alloy as Nd 13.5 Fe 76 co 4.5 Ga 0.5 B 5.5 (at%) and Al 0.25 CoFeNiCu 0.75 According to the nominal composition ratio, the material ratio of the two alloys is carried out respectively.

[0062] ②The prepared alloy raw material Nd 13.5 Fe 76 co 4.5 Ga 0.5 B 5.5 and Al 0.25 CoFeNiCu 0.75 Put them into vacuum arc melting furnace or induction melting furnace respectively, and melt them repeatedly 5 times under the protection of inert gas, so that the ingots are fully alloyed, and alloy ingots are respectively obtained after cooling.

[0063] ③ Put the obtained main alloy ingot into the quartz tube of the vacuum rapid quenching furnace after coarse crushing, and perform rapid quenching of the melt under the protection of the argon atmosphere to obtain the required rapid quenching strips. Wherein, the diameter of the nozzle of the quartz tube is 1mm, the distance from the roller surface is 1mm, ...

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Abstract

Provided are a nanocrystalline thermal deformation neodymium-iron-boron permanent magnet and a preparing method thereof. The nanocrystalline thermal deformation neodymium-iron-boron permanent magnet is prepared from main alloy powder and auxiliary high-entropy alloy powder; the main alloy powder is composed of RexFe(100-x-y-z)MyBz on the basis of an atomic percent, wherein Re is one or more of La,Ce, Pr, Nd, Dy, Tb, Gd, Ho, Er, Y and the like, M is one or more of Co, Ga, Cu and Al, x is bigger than or equal to 12 and smaller than or equal to 15, y is bigger than or equal to 0.1 and smaller than or equal to 6, and z is bigger than or equal to 5 and smaller than or equal to 8; main elements of the auxiliary high-entropy alloy powder are FeCoNiM1M2, wherein M1 and M2 are one or more of Cu, Al, Cr, Mn, Ga, Zn, Sn, Mg, Si and B and are different, and all the elements are distributed on the basis of a high-entropy alloy design principle. The obtained nanocrystalline thermal deformation neodymium-iron-boron permanent magnet integrated magnet mixed with the high-entropy alloy powder with high plasticity and good soft magnetism is excellent in performance.

Description

technical field [0001] The invention relates to the technical field of rare earth permanent magnet materials, in particular to a high-performance nanocrystalline thermally deformed NdFeB permanent magnet and a preparation method thereof, specifically by doping a high-entropy high-plasticity, medium-strength, and soft magnetic good Alloy powders are used to improve the magnetic properties of nanocrystalline hot-deformed NdFeB permanent magnets. Background technique [0002] NdFeB magnetic material is an alloy composed of praseodymium neodymium metal and boron iron, also known as magnetic steel. NdFeB permanent magnet materials are widely used in emerging technical fields such as wind power generation, new energy vehicles, and maglev trains due to their excellent magnetic properties. As a technology invented at the same time as the sintering process, the thermal deformation process has been highly regarded by the majority of scientific researchers. Attention, it can be used t...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01F1/057H01F41/02
CPCH01F1/0576H01F41/0266
Inventor 李家节仲洁邓永芳曾亮亮黄祥云喻玺杜君峰杨斌
Owner JIANGXI UNIV OF SCI & TECH
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