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Cerium-enriched rare earth permanent magnet applying lanthanum in batches and preparation method thereof

A technology of cerium-rich rare earth and permanent magnet, which is applied in the fields of magnetic objects, inductor/transformer/magnet manufacturing, magnetic materials, etc., can solve the problem that lanthanum cannot be applied in batches, and achieve the suppression of magnetic dilution effect, protection of rare earth resources, and promotion of production and sales balanced effect

Active Publication Date: 2017-10-20
ZHEJIANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to overcome the long-standing deficiency that lanthanum cannot be applied in batches to rare earth permanent magnets, and provide a cerium-rich rare earth permanent magnet with batch application of lanthanum and a preparation method thereof

Method used

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preparation example Construction

[0017] The preparation method of the cerium-rich rare earth permanent magnet using lanthanum in batches is as follows:

[0018] 1) According to the design of the main phase components, the ingredients are separately prepared, and the vacuum degree is higher than 10 -2 Different main phase alloys are smelted in a vacuum intermediate frequency induction furnace in Pa, and different main phase alloy flakes with a thickness of 0.2-0.5mm are obtained by quick-setting casting strip technology, and then prepared by hydrogen explosion and jet milling processes with an average particle size of 3-4μm. Corresponding alloy powder;

[0019] 2) Uniformly mix the corresponding main phase alloy powders according to the ratio to obtain mixed main phase powders with different La-Ce substitution amounts, and then carry out orientation pressing under a magnetic field of 1.5-2T to obtain a green body;

[0020] 3) Vacuum-encapsulate the green body obtained, cold isostatic pressing at 15-20 MPa for...

Embodiment 1

[0023] 1) In terms of mass percentage, the composition is [Nd 0.6 (La 0.25 Ce 0.75 ) 0.4 ] 30.5 Fe 67.11 co 0.8 Zr 0.59 B 1 The main phase A and Nd 30.5 Fe 67.11 co 0.8 Zr 0.59 B 1 The main phase B is batched separately, and the vacuum degree is higher than 10 -2 After smelting in a vacuum intermediate frequency induction furnace in Pa, the corresponding main phase flakes with a thickness of 0.3mm are obtained by using the quick-setting casting belt technology;

[0024] 2) Prepare the corresponding alloy powder with an average particle size of 3.3 μm by subjecting the corresponding main phase flakes to hydrogen explosion and jet milling;

[0025] 3) After uniformly mixing the A and B main phase alloy powders according to the mass ratio of 1:4, under the protection of nitrogen, the mixed main phase powders are oriented and formed under a magnetic field of 2T, and are formed into a green body by 17MPa cold isostatic pressing;

[0026] 4) Put the green body in a vac...

Embodiment 2

[0036] 1) In terms of mass percentage, the composition is [Nd 0.5 (La 0.25 Ce 0.75 ) 0.5 ] 30.5 Fe 67.11 Ga 1.39 B 1 The main phase A, [Nd 0.7 (La 0.25 Ce 0.75 ) 0.3 ] 30.5 Fe 67.11 Ga 1.39 B 1 The main phase B and Nd 30.5 Fe 67.11 Ga 1.39 B 1 The main phase C is batched separately, and the vacuum degree is higher than 10 -2 After smelting in a vacuum intermediate frequency induction furnace in Pa, the corresponding main phase flakes with a thickness of 0.31mm are obtained by using the quick-setting casting belt technology;

[0037] 2) Prepare the corresponding alloy powder with an average particle size of 3.2 μm by subjecting the corresponding main phase flakes to hydrogen explosion and jet milling;

[0038] 3) After uniformly mixing the main phase alloy powders of A, B and C according to the mass ratio of 1:1:2, under the protection of nitrogen, the mixed main phase powder was oriented and formed under a magnetic field of 2T, and subjected to 17MPa cold is...

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Abstract

The invention discloses a cerium-enriched rare earth permanent magnet applying lanthanum in batches and a preparation method thereof. The rare earth permanent magnet has the multi-principal-phase structure including a RE-Fe-B principal phase and one or more lanthanum added cerium-enriched principal phases. After component designing, dosing and powder making of the different principal phases are performed separately, alloy powder of the corresponding principal phases is proportionally mixed to be uniform, and then the magnet is prepared through magnetic field compression, sintering and thermal treatment. The problem that a lanthanum element cannot be applied to a rare earth permanent magnet for a long time is solved, and a large number of lanthanum elements can be applied to the rare earth permanent magnet; meanwhile, by adding the lanthanum elements with the large atomic radius into the cerium-enriched principal phase components, the magnetic performance of the cerium-enriched principal phase is kept and improved, so that the performance of the permanent magnet can meet the commercial standard, and massive production and application can be performed.

Description

technical field [0001] The invention relates to a cerium-rich rare earth permanent magnet using lanthanum in batches and a preparation method thereof Background technique [0002] Generally, the abundance index is used to measure the content percentage of each element in the earth's crust. The two most abundant rare earth elements in the earth's crust, Ce (cerium) and La (lanthanum), are veritable high-abundance elements. In recent years, the application of Ce or La to rare earth permanent magnets has received extensive attention, and researchers at home and abroad have done a lot of research work on it. Although Ce 2 Fe 14 B and La 2 Fe 14 The intrinsic magnetic properties of B are better than those of Nd 2 Fe 14 B is much worse, but the Ce-rich rare earth permanent magnet prepared by substituting part of Nd element with Ce element has made great progress. By optimizing the traditional preparation process, the researchers greatly weakened the magnetic dilution effect...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01F1/057H01F41/02
CPCH01F1/0573H01F1/0576H01F1/0577H01F41/0266
Inventor 严密彭白星金佳莹
Owner ZHEJIANG UNIV
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