Fabrication method of high-coercivity Nd-Ce-Fe-B sintered magnet

A technology of Nd-Cerium-Fe-Bron and sintered magnets, which is applied in the fields of magnetic objects, inductance/transformer/magnet manufacturing, magnetic materials, etc., can solve the problems of low coercive force and easy oxidation of magnetic powder, so as to improve coercive force and save energy Consumption, the effect of preventing powder oxidation

Inactive Publication Date: 2018-11-30
NANJING UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] The purpose of the present invention is to overcome the problems of low coercive force and easy oxidation of magnetic powder in the prior art of Ce-rich rare earth permanent magnet materials, so as to provide a method for preparing NdCeFeB magnets with simple process and obvious coercive force improvement

Method used

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  • Fabrication method of high-coercivity Nd-Ce-Fe-B sintered magnet
  • Fabrication method of high-coercivity Nd-Ce-Fe-B sintered magnet
  • Fabrication method of high-coercivity Nd-Ce-Fe-B sintered magnet

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Embodiment 1

[0037] (1) The Ce principal element alloy is prepared by induction smelting and quick-setting strip technology to prepare alloy flakes, wherein the alloy is expressed in mass percentage, and its composition is (Pr 0.12 Nd 0.48 Ce 0.4 ) 33 Fe 65 m 1.0 B 1.0 , wherein M is Co=0.5, Cu=0.35, Zr=0.05, Ga=0.1.

[0038] (2) The alloy flakes are subjected to hydrogen explosion and jet milling, and the average particle size is about 3.5 μm.

[0039] (3) Add the Dy organic complex solution to the mixed alloy powder, under nitrogen (N 2 ) under a protective atmosphere in a three-dimensional drum mixer for 0.5h, wherein dysprosium tricyclopentadiene Dy(C 5 h 5 ) 3 The volume of the 95# aviation gasoline solution is compared to the mixed alloy powder mass ratio to add 5mL in every kilogram of alloy powder; Described Dy organic complex solution is preferably tricyclopentadiene dysprosium Dy(C 5 h 5 ) 3 95# aviation gasoline solution. The three-dimensional drum mixer is preferab...

Embodiment 2

[0045] (1) The Ce-rich principal element alloy and the Ce-free principal element alloy are respectively prepared into alloy powders by induction melting, rapid solidification casting, hydrogen explosion and jet milling. The average particle size of the powder is about 3.5 μm. Elemental alloys are expressed in mass percentages, and their composition is (Pr 0.1 Nd 0.4 Ce 0.5 ) 30.5 Fe 67 m 1.5 B 1.0 , wherein M is Al=0.5, Co=0.5, Cu=0.35, Zr=0.05, Ga=0.1; the Ce-free principal element alloy is expressed in mass percentage, and its composition is (Pr 0.2 Nd 0.8 ) 30.5 Fe 67 m 1.5 B 1.0 , wherein M is Al=0.5, Co=0.5, Cu=0.35, Zr=0.05, Ga=0.1.

[0046] (2) Take the Ce-rich principal element alloy powder and the Ce-free principal element alloy powder according to the ratio of mass fraction of 6:4, and then add the Pr complex organic solution to the mixed alloy powder, under nitrogen protection atmosphere Mix evenly in a three-dimensional drum mixer for 0.5h, in which tri...

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Abstract

The invention belongs to the technical field of a permanent-magnet material, and particularly discloses a fabrication method of a high-coercivity Nd-Ce-Fe-B sintered magnet. According to the method, surface wetting and coating is performed on magnet powder by employing a rare-earth complex organic solvent during mixing, the oxidization of Ce-rich magnetic powder is effectively controlled; meanwhile, elements C and H become gas and are escaped during the high-temperature sintering and decomposition process of a rare-earth complex on a surface of the magnetic powder, heavy rare-earth elements Pr/Nd/Tb/Dy/Ho resided on surfaces of alloy powder particles are used as diffusion sources and are diffused towards a grain surface, magnetic hardening on a main-phase grain surface is achieved, the local magnetocrystalline anisotropy is improved, and the coercivity of the Nd-Ce-Fe-B magnet is improved. The Nd-Ce-Fe-B sintered magnet fabricated by the method is relatively high in coercivity, a traditional sintered magnet fabrication technology is improved, and the technology is simple in process and low in cost and is suitable for mass production.

Description

technical field [0001] The invention belongs to the technical field of permanent magnet materials, and in particular relates to a preparation method of a high coercive force NdCeFeB sintered magnet. Background technique [0002] Neodymium iron boron (Nd-Fe-B) permanent magnet material is currently the most magnetic and widely used magnetic functional material. After more than 30 years of development since its discovery in 1984, Nd-Fe-B permanent magnets are widely used in hybrid vehicles and Wind turbines, etc., have become indispensable important functional materials for high-tech industries. At the same time, Nd-Fe-B permanent magnets are also the materials that consume the most rare earths, and the annual consumption of rare earths is close to half of the total amount of rare earths used in my country. In recent years, the downstream industry's demand for Nd-Fe-B permanent magnets has grown by leaps and bounds. Nd-Fe-B magnets are highly dependent on Nd, Pr, Dy, Tb and ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01F1/057H01F41/02
Inventor 张玉晶徐锋龚元元缪雪飞徐桂舟刘二
Owner NANJING UNIV OF SCI & TECH
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