Cerium-containing magnet with high coercivity and preparation method thereof

A technology of high coercive force and magnets, applied in the direction of magnetic objects, inductors/transformers/magnets, magnetic materials, etc. question

Active Publication Date: 2020-02-28
ADVANCED TECHNOLOGY & MATERIALS CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in the engineering batch production process, after the auxiliary alloy with high rare earth content is prepared into a fine powder below 4 μm, it is very easy to oxidize, and it is difficult to store for a long time. If the air is not properly isolated during the storage process, it may even occur fire accident
After the auxiliary alloy is oxidized and then mixed with the main alloy, it will not be able to modify the grain boundary, let alone improve the magnetic properties

Method used

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  • Cerium-containing magnet with high coercivity and preparation method thereof
  • Cerium-containing magnet with high coercivity and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] 1) Proportioning various rare earth and transition metal raw materials into

[0038] The nominal composition of Pr4Nd16Ce8Ho3FebalCo1Zr0.1B1 is prepared by conventional vacuum smelting and quick-setting flake technology to prepare Ce-containing main alloy quick-setting flakes with a thickness of about 0.3mm;

[0039] 2) Proportioning Pr10Nd40Fe50 with praseodymium and neodymium metal and iron raw materials to form a nominal composition of Pr10Nd40Fe50, using a conventional quick-setting flake process to prepare a grain boundary optimized auxiliary alloy quick-setting sheet with a thickness of about 0.3 mm;

[0040] 3) Mix the quick-setting flakes of the main alloy containing Ce and the quick-setting flakes of the grain boundary optimized auxiliary alloy at a weight ratio of 1:0.06, and carry out hydrogen crushing and jet milling together to obtain a mixed powder with an average particle size of 2.8 μm; among them, hydrogen crushing The specific treatment is: under the h...

Embodiment 2

[0045] 1) Proportioning various rare earth and transition metal raw materials into

[0046] The nominal composition of Pr3Nd16Ce10Gd2FebalCo1Nb0.3B1 is prepared by conventional vacuum melting and quick-setting flake technology to prepare Ce-containing main alloy quick-setting flakes with a thickness of about 0.3mm;

[0047] 2) Proportion the raw materials into the nominal composition of Pr20Nd60Cu20, and prepare a grain boundary optimized auxiliary alloy quick-setting sheet with a thickness of about 0.3 mm by conventional quick-setting flake technology;

[0048] 3) Mix the Ce-containing main alloy quick-setting flakes and the grain boundary optimized auxiliary alloy quick-setting flakes at a weight ratio of 1:0.04, and perform hydrogen crushing and jet milling together to obtain a mixed powder with an average particle size of 2.6 μm; among them, hydrogen crushing The specific treatment is as follows: under the hydrogen pressure of 0.0.3Mpa, the mixed alloy quick-setting sheet ...

Embodiment 3

[0054] 1) Proportioning various rare earth and transition metal raw materials into

[0055] The nominal composition of Pr5Nd20Ce6Al0.2Cu0.2FebalCo1Nb0.2B1 is prepared by conventional vacuum melting and quick-setting flake technology to prepare Ce-containing main alloy quick-setting flakes with a thickness of about 0.3mm;

[0056] 2) Proportion the raw materials into the nominal composition of Ho56Fe14Cu30, and prepare a grain boundary optimized auxiliary alloy quick-setting sheet with a thickness of about 0.3 mm by using a conventional quick-setting flake process;

[0057] 3) Mix the Ce-containing main alloy quick-setting flakes and grain boundary optimized auxiliary alloy quick-setting flakes at a weight ratio of 1:0.08, and carry out hydrogen crushing and jet milling together to obtain a mixed powder with an average particle size of 3.0 μm; wherein, hydrogen crushing The specific treatment is: under the hydrogen pressure of 0.25Mpa, the mixed alloy quick-setting sheet absorb...

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Abstract

The invention discloses a preparation method of a cerium-containing magnet with high coercivity. The method comprises steps that raw materials of the Ce-containing main alloy are blended; raw materials of the grain boundary optimization auxiliary alloy are blended; the raw materials of the Ce-containing main alloy and the raw materials of the grain boundary optimization auxiliary alloy are subjected to vacuum smelting and rapid hardening melt-spinning treatment correspondingly, and a Ce-containing main alloy rapid hardening sheet and a boundary optimization auxiliary alloy rapid hardening sheet are obtained; the Ce-containing main alloy rapid hardening sheet and the grain boundary optimization auxiliary alloy rapid hardening sheet are mixed according to a weight ratio of 1:x, then hydrogendecrepitation treatment and jet milling treatment are performed to obtain mixed powder, lubricating agent is added into the mixed powder and mixed to obtain mixture; magnetic field orientation compression of the mixture is performed, and isostatic cool pressing is performed to obtain a green body; sintering of the green body is performed, and then tempering heat treatment is performed to obtain acerium-containing magnet. The method is advantaged in that the preparation process is effectively simplified, and the risk that the auxiliary alloy is oxidized can be effectively reduced.

Description

technical field [0001] The invention belongs to the field of rare earth permanent magnet preparation, and in particular relates to a high coercive force cerium-containing magnet and a preparation method thereof. Background technique [0002] Sintered NdFeB magnets have the characteristics of high magnetic energy product and high coercive force at the same time, and are widely used in electronic products, wind power generation, new energy vehicles, industrial motors and other fields. In sintered NdFeB magnets, rare earths such as praseodymium, neodymium, dysprosium, and terbium are crucial and irreplaceable core raw materials. Although China is the largest owner of rare earth mines in the world, since it supplies more than 90% of the world's demand for rare earth raw materials, it has brought enormous pressure and risks to the country's sustainable development of rare earth resources. The Baiyun Obo Mine in Inner Mongolia is the largest bastnaesite rare earth mine in the wor...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01F1/057H01F41/02C22C38/00C22C30/00B22F5/00
CPCB22F5/00C22C30/00C22C38/005H01F1/0576H01F1/0577H01F41/0266
Inventor 李建陈杰周磊程星华刘涛邓志伟喻晓军
Owner ADVANCED TECHNOLOGY & MATERIALS CO LTD
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