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Method for preparing cheap light rare earth lanthanum cerium iron boron nano-crystal permanent magnet

A light rare earth, nanocrystalline technology, used in magnetic objects, inductance/transformer/magnet manufacturing, magnetic materials, etc., can solve the problem of difficult magnetic hardening of magnets, no pure lanthanum cerium bulk magnets, low intrinsic magnetic properties, etc. question

Active Publication Date: 2017-06-09
BEIJING UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] There are several problems in the preparation of light rare earth lanthanum and cerium iron boron magnets: 1) The intrinsic magnetism is relatively low
La 2 Fe 14 B and Ce 2 Fe 14 The saturation magnetization of B is 13.8kGs and 11.7kGs respectively, the anisotropy field is 20kOe and 26kOe, and the Curie temperature is 257°C and 149°C, which are much lower than that of Nd 2 Fe 14 The saturation magnetization of B is 16.1kGs, the anisotropy field is 73kOe and the Curie temperature is 313°C; therefore, the sintered La / Ce-Fe-B magnet prepared by traditional powder metallurgy method is difficult to magnetically harden and obtain coercive force, which This is one of the reasons why it is not widely used
2) It is difficult to form a stable single-phase 2:14:1 compound
However, there are no related reports on pure lanthanum cerium bulk magnets with high coercive force, and the research on bulk magnets is of great significance for practical applications

Method used

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  • Method for preparing cheap light rare earth lanthanum cerium iron boron nano-crystal permanent magnet
  • Method for preparing cheap light rare earth lanthanum cerium iron boron nano-crystal permanent magnet
  • Method for preparing cheap light rare earth lanthanum cerium iron boron nano-crystal permanent magnet

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] A (La 0.3 Ce 0.7 ) 2 Fe 14 B hot-pressed magnet preparation, implement according to the following steps:

[0026] In the first step, press (La 0.3 Ce0.7 ) 2 Fe 14 Proportion B is carried out, and after the batching is completed, it is placed in a suspension melting furnace, heated to melt it under an argon atmosphere, mixed evenly and cooled to room temperature naturally, and smelted repeatedly in this way for 4 times to obtain a uniform ingot;

[0027] In the second step, the ingot obtained in the first step is taken out, the surface oxide is mechanically polished off, and mechanically crushed, the ingot fragments are as uniform as possible, and then put into a quartz tube;

[0028] The third step is to install the quartz tube containing the ingot on the melt quenching equipment, turn on the heating system to melt the ingot block, let the alloy liquid spray from the nozzle to the high-speed rotating copper roller, and then collect the quenching belt. The surface...

Embodiment 2

[0032] A (La 0.3 Ce 0.7 ) 3 Fe 14 B hot-pressed magnet preparation, implement according to the following steps:

[0033] In the first step, press (La 0.3 Ce 0.7 ) 3 Fe 14 Proportion B is carried out, and after the batching is completed, it is placed in a suspension melting furnace, heated to melt it under an argon atmosphere, mixed evenly and cooled to room temperature naturally, and smelted repeatedly in this way for 4 times to obtain a uniform ingot;

[0034] In the second step, the ingot obtained in the first step is taken out, the surface oxide is mechanically polished off, and mechanically crushed, the ingot fragments are as uniform as possible, and then put into a quartz tube;

[0035] The third step is to install the quartz tube containing the ingot on the melt quenching equipment, turn on the heating system to melt the ingot block, let the alloy liquid spray from the nozzle to the high-speed rotating copper roller, and then collect the quenching belt. The surfa...

Embodiment 3

[0039] A (La 0.3 Ce 0.7 ) 4 Fe 14 B hot-pressed magnet preparation, implement according to the following steps:

[0040] In the first step, press (La 0.3 Ce 0.7 ) 4 Fe 14 Proportion B is carried out, and after the batching is completed, it is placed in a suspension melting furnace, heated to melt it under an argon atmosphere, mixed evenly and cooled to room temperature naturally, and smelted repeatedly in this way for 4 times to obtain a uniform ingot;

[0041] In the second step, the ingot obtained in the first step is taken out, the surface oxide is mechanically polished off, and mechanically crushed, the ingot fragments are as uniform as possible, and then put into a quartz tube;

[0042] The third step is to install the quartz tube containing the ingot on the melt quenching equipment, turn on the heating system to melt the ingot block, let the alloy liquid spray from the nozzle to the high-speed rotating copper roller, and then collect the quenching belt. The surfa...

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Abstract

A method for preparing a cheap light rare earth lanthanum cerium iron boron nano-crystal permanent magnet belongs to the field of rare-earth permanent magnets. The method includes: performing matching according to (Lax / Ce1-x) yFe14B, x=0-1, y=2.0-4.0 element mole ratio, putting the matched material into a suspension smelting furnace, performing heating and smelting in the argon atmosphere, and acquiring an even ingot casting; performing mechanical grinding on the ingot casting to remove surface oxide, performing smashing, and filling the ingot casting fragments in a quartz tube; arranging the quartz tube filled with the ingot casting on a melt rapid quenching device to perform melting, spraying alloy fluid to a copper roller which is rotating at a high speed from a nozzle, allowing the alloy fluid to contact the copper roller to be rapidly cooled, and acquiring a rapid quenching band; and screening the rapid quenching band to remove impurities, smashing the rapid quenching band and performing screening, putting the smashed rapid quenching band in a die, putting the die in a discharging plasma sintering furnace, and performing hot pressing sintering at a suitable temperature and pressure. The method can easily achieve rapid sintering of materials, and can acquire compact ultra-fine crystal even nano-crystal sintering body.

Description

technical field [0001] The invention relates to a preparation method of a cheap light rare earth lanthanum cerium iron boron nanocrystalline permanent magnet, belonging to the field of rare earth permanent magnets. Background technique [0002] Among all magnetic materials, permanent magnet materials are used in the first place, and rare earth permanent magnets are an important part of permanent magnet materials. They are widely used in many fields such as machinery, information, energy, and transportation. one of the supporting materials. [0003] In 1984, researchers in Japan and the United States prepared NdFeB (2:14:1) permanent magnets with a tetragonal structure by using powder metallurgy and rapid quenching respectively, thus announcing the birth of the third generation of rare earth permanent magnet materials. Today, NdFeB permanent magnets are still the permanent magnets with the best performance, known as the "magnet king". With the development of automation tech...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01F1/057H01F41/02
Inventor 路清梅钮建岳明刘卫强张东涛
Owner BEIJING UNIV OF TECH
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