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Composite magnet assembled by multiple permanent magnet main phase functional elements, and preparation method thereof

A technology of composite magnets and functional primitives, applied in the direction of magnetic objects, inductance/transformer/magnet manufacturing, magnetic materials, etc., can solve the problems of low magnetic performance, no more than 30wt.%, and difficulty in improving the magnetic performance of Ce-containing magnets. Achieve the effects of high saturation magnetization, high anisotropy field, and high mechanical properties

Active Publication Date: 2021-12-10
CENT IRON & STEEL RES INST
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Ce prepared by traditional preparation method 2 Fe 14 The B magnet cannot meet the user's performance requirements
At present, most of the existing technologies about Ce-containing magnets are partially replaced by Ce 2 Fe 14 Nd in B, the content of Ce is often no more than 40wt.%, for example: in the Chinese invention patent application CN1035737A of the General Iron and Steel Research Institute of the Ministry of Metallurgical Industry, the Ce content is no more than 30wt.%; Document [J.Magn.Magn.Mater .294, e127 (2005)] and [J.Appl.Phys.105, 07A704 (2009)] although Ce has also been added, but the content does not exceed 20wt.%; Nanjing University of Science and Technology, Jiangsu Chenlang Electronics Group Co., Ltd. Chinese invention patent application CN102220538A and Magnequench Magnetic (Tianjin) Co., Ltd. Chinese invention patent application CN101694797A raises the Ce content to 40wt.%, but its final product is isotropic magnetic powder, and magnetic performance is extremely low, and can not be obtained Anisotropic magnets; in the article [J.Appl.Phys.75,6268(1994)], although the Ce content is also raised to 40wt.%, it studies magnets containing silicon (Si), and uses a single alloy process, can not get dual main phase alloy, extremely low magnetic properties and no practical value
The literature [Applied Physics Letters63,3642(1993)] pointed out that Ce 2 Fe 14 The valence state of Ce in B ingot is +3.44, so the magnetic properties cannot be effectively improved
[0004] The applicant’s Chinese patents CN 102800454B and CN 102436892B involve dual main-phase Ce magnets, whose magnetic properties are higher than all previous single-alloy or double-alloy Ce-containing magnets, which have practical value and promote the development of the Ce magnet industry, but their When designing the composition, the main phase containing Ce must be added with other rare earth elements, without considering the matching rules of the intrinsic magnetic properties of the dual main phase magnetic base alloy, it is difficult to obtain higher magnetic properties
The biggest problem faced by the Ce-containing magnets prepared before is that the valence state of Ce is mostly around +3.44, and the Ce-containing magnets have not been prepared by the dual-main-phase alloy method, which is also one of the main reasons why the magnetic properties of Ce-containing magnets are difficult to improve.[ Mater.China 36,63(2017)], at the same time lack of understanding of the valence regulation of Ce

Method used

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  • Composite magnet assembled by multiple permanent magnet main phase functional elements, and preparation method thereof
  • Composite magnet assembled by multiple permanent magnet main phase functional elements, and preparation method thereof
  • Composite magnet assembled by multiple permanent magnet main phase functional elements, and preparation method thereof

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Experimental program
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Effect test

Embodiment 1

[0074] Composite magnets are prepared according to the above method, and at least two main phase alloys (Nd, RE')-Fe-TM-B and (RE", Ce)-Fe-TM-B of different functional units are prepared, and their respective Anisotropy field H a The ratio range of the anisotropy constant is 1.144 to 2.700, the ratio range of the anisotropy constant is 1.152 to 2.950, and the mass percentage of the final chemical composition of the magnet is (Nd 80 Ce 20 ) 30.00 Febal B 0.95 tm 0.70 (TM=Ga, Co, Cu, Al), in which 20wt.% of Nd is replaced by Ce, the spectral valence state of Ce in the magnet is about +3.09, and a magnet with high Ce content and high energy product is obtained.

[0075]

Embodiment 2

[0077] Composite magnets are prepared according to the above method, at least two main phase alloys (Nd, RE')-Fe-TM-B and (RE", Ce)-Fe-TM-B of different functional units are prepared, and their respective Anisotropy field H a The ratio range of the anisotropy constant is 1.144 to 2.700, the ratio range of the anisotropy constant is 1.152 to 2.950, and the mass percentage of the final chemical composition of the magnet is (Nd 20 Ce 80 ) 30.00 Febal B 0.95 tm 0.70 (TM=Ga, Co, Cu, Al), in which 80wt.% of Nd is replaced by Ce, the spectral valence state of Ce in the magnet is about +3.08, and the magnet with high Ce content and high magnetic energy product is obtained.

[0078]

Embodiment 3

[0080] Composite magnets are prepared according to the above method. The main main phase element of the final magnet is the permanent magnetic phase containing Nd-Fe-B and polycobalt (RE', Nd)-Fe-TM-Co-B, and its magnetocrystalline anisotropy constant K 1 (A) / K 1 (B) The ratio range is 0.990 ~ 1.260, and the mass percentage of the chemical composition is Nd 30.00 FebalCo 60 B 0.95 tm 0.70 (TM=Ga, Co, Cu, Al), Fe is replaced by 60wt.% Co, the spectral valence state of Ce in the magnet is about +3.09, and a magnet with high Ce content and high Co is obtained.

[0081]

[0082]

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Abstract

The invention relates to a composite magnet assembled by multiple permanent magnet main phase functional elements, and a preparation method thereof. The composite magnet has a RE-Fe-B first permanent magnet main phase and a multiferroic and / or multicobalt second permanent magnet main phase in a use state, the multiferroic or multicobalt permanent magnet main phase is formed by compounding permanent magnet main phase functional elements which contain RE or do not contain RE and have different functions; and main phase alloys are prepared firstly, and the following composite magnets with different functions of high resistivity, high corrosion resistance, high saturation magnetization intensity, high mechanical property, high Curie temperature, high wear resistance and high pressure resistance are obtained by adjusting the mass percent of the alloys. According to the invention, only the traditional preparation process needs to be improved, and no extra preparation process needs to be added.

Description

technical field [0001] The invention belongs to the technical field of rare earth permanent magnet materials, in particular to a composite magnet assembled with double / multiple permanent magnet main phase functional elements and a preparation method thereof. Background technique [0002] NdFeB magnets are the third generation of rare earth permanent magnet materials after SmCo magnets. Compared with SmCo magnets with high coercive force and low temperature coefficient, NdFeB magnets have high remanence B r , high energy product (BH) max , is a veritable "Magnetic King". Since its discovery, it quickly occupied the market and became one of the key materials of modern science and technology. Metal neodymium (Nd) in NdFeB magnets accounts for more than 90% of the cost of raw materials. With the increasing production of rare earth permanent magnets in the world, the usage of metal neodymium has been greatly increased, which has caused great pressure on magnetic material manufac...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01F1/057H01F41/02
CPCH01F1/0577H01F41/0266Y02T10/64
Inventor 朱明刚张乐乐孙齐松刘涛石晓宁郭英健李卫
Owner CENT IRON & STEEL RES INST
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