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Preparation method of neodymium-iron-boron magnetic material

A neodymium-iron-boron and magnetic material technology, applied in the direction of magnetic materials, inductance/transformer/magnet manufacturing, magnetic objects, etc., can solve the problems of reducing the saturation magnetization of the main phase crystal grains and reducing the remanence of the magnet, so as to reduce the residual magnetization. Magnetic reduction, high coercivity effect

Active Publication Date: 2021-07-09
宁波合力磁材技术有限公司
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  • Abstract
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  • Claims
  • Application Information

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Problems solved by technology

[0005] However, during the grain boundary diffusion, due to the influence of the microstructure of the main phase grains and the grain boundary phase, part of dysprosium and terbium did not continue to diffuse into the magnet along the grain boundary phase, but entered into the main phase grains, and were separated from the main phase. The replacement of Nd in the phase grains reduces the saturation magnetization of the main phase grains, resulting in a decrease in the remanence of the magnet, and the (Dy / Tb) formed by the substitution reaction at the grain boundary 2 Fe 14 The relative reduction of B inhibits the improvement of the coercive force of the magnet

Method used

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  • Preparation method of neodymium-iron-boron magnetic material
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  • Preparation method of neodymium-iron-boron magnetic material

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preparation example Construction

[0038] Examples of Preparation of Raw Materials and / or Intermediates

[0039] Praseodymium neodymium powder (PrNd): Purchased from Beijing Xingrongyuan Technology Co., Ltd., it is made by mixing praseodymium powder and neodymium powder. The purity of both praseodymium powder and neodymium powder is 99.99%, and praseodymium accounts for 15.5wt% of the total amount of praseodymium neodymium powder , and its particle size can be adjusted according to needs. In this embodiment, the two grades of particle size of 1-6 μm and 8-12 μm are used as examples for illustration.

[0040] Ferro-boron powder: purchased from Hebei Yirui Alloy Welding Material Co., Ltd., low-carbon ferro-boron powder (C≤0.1%), with a boron content of 20%, and its particle size can be adjusted according to needs. This embodiment also uses 1-6 μm and The two particle sizes of 6-12μm are taken as an example to illustrate.

[0041] Iron powder: purchased from Shijiazhuang Hualang Mineral Products Trading Co., Ltd., ...

Embodiment 1

[0048] A neodymium-iron-boron magnetic material consisting of the following fractions: praseodymium neodymium 15wt%, boron 0.92wt%, terbium 1.2wt%, holmium 2wt%, cerium 18wt%, lanthanum 4wt%, cobalt 1wt%, copper 0.1wt% %, aluminum 0.8wt%, gallium 1wt%, zirconium 0.1wt%, the balance is Fe and non-removable impurities.

[0049] The preparation method of the above-mentioned NdFeB magnetic material comprises the following steps:

[0050] ①. Melting belt: According to the content of each component of the above-mentioned NdFeB magnetic material, weigh the corresponding mass of NdPr powder, FeB powder, iron powder and auxiliary metal powder (cerium, lanthanum, cobalt, copper, aluminum, gallium, etc.) and zirconium) into the melting furnace, wherein the particle size of neodymium powder, boron-iron powder and iron powder are all 1-6μm, and the particle size of auxiliary metal powder is 8-12μm, and the furnace is evacuated to a vacuum degree of 5Pa. Melting is carried out to obtain Th...

Embodiment 2

[0058] A neodymium-iron-boron magnetic material consisting of the following fractions: praseodymium neodymium 20wt%, boron 1wt%, terbium 2wt%, dysprosium 4wt%, cerium 15wt%, lanthanum 1wt%, copper 0.15wt%, aluminum 0.2wt% , gallium 1.3wt%, zirconium 0.2wt%, the balance is Fe and non-removable impurities.

[0059] The preparation method of the above-mentioned NdFeB magnetic material comprises the following steps:

[0060] ①. Melting belt: According to the content of each component of the above-mentioned NdFeB magnetic material, weigh the corresponding mass of NdPr powder, FeB powder, iron powder and auxiliary metal powder (cerium, lanthanum, copper, aluminum, gallium and zirconium) Throw it into the melting furnace, in which the particle size of neodymium powder, boron-iron powder and iron powder are all 8-12 μm, and the particle size of the auxiliary metal powder is 8-12 μm, and smelting is carried out when the furnace is evacuated to a vacuum degree of 3 Pa, and the obtained ...

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Abstract

The invention relates to the technical field of neodymium-iron-boron magnetic materials, in particular to a preparation method of a neodymium-iron-boron magnetic material, which comprises the preparation steps of melt-spinning, hydrogen demolishing and grinding, compression molding, magnetism generation and sheet preparation, rare earth pulping, slurry coating and diffusion sintering. The diffusion of heavy rare earth elements such as dysprosium and terbium in the crystalline phase can be effectively promoted, meanwhile, diffusion of the rare earth elements into main phase grains is inhibited, the effective utilization rate of heavy rare earth elements such as dysprosium and terbium is increased, and the coercive force of the neodymium-iron-boron magnetic material is greatly improved.

Description

technical field [0001] The present application relates to the technical field of NdFeB magnetic materials, more specifically, it relates to a preparation method of NdFeB magnetic materials. 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. [0003] The addition of heavy rare earth elements such as terbium and dysprosium can significantly increase the coercive force of sintered NdFeB magnets. Therefore, heavy rare earth elements such as terbium and dysprosium are indispensable and important component elements in the production of high-performance NdFeB magnets. However, heavy rare earth elements such as terbium and dysprosium are rare and non-renewable resources. While adhering to sust...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01F41/02H01F1/057
CPCH01F1/0573H01F1/0576H01F1/0577H01F41/0293
Inventor 赵吉明韩春昌赵文超徐林云
Owner 宁波合力磁材技术有限公司
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