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an inhibitor of cefe 2 Phase mixed rare earth iron boron magnet preparation method

A technology of mixing rare earths and magnets, which is applied in the fields of magnetic objects, magnetic materials, inductors/transformers/magnets, etc., which can solve problems such as restricting the development of mixed rare earth iron-boron, failing to meet the use requirements, reducing the magnetization intensity of magnets, etc., to improve performance , reduce production costs, optimize the effect of phase structure

Active Publication Date: 2019-08-23
BEIJING UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

CeFe 2 The soft magnetic phase will not only reduce the magnetization of the magnet, but also affect the coercive force of the magnet, resulting in the failure of the sintered magnet to meet the actual use requirements, which restricts the development of mixed rare earth iron boron

Method used

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  • an inhibitor of cefe <sub>2</sub> Phase mixed rare earth iron boron magnet preparation method
  • an inhibitor of cefe <sub>2</sub> Phase mixed rare earth iron boron magnet preparation method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] 1) Melting ingots and quick-setting tablets: according to the nominal composition La 7 MM 24.5 Fe 66 M(Al 0.3 Cu 0.3 co 0.2 Ga 0.4 Zr 0.3 )B 1 (wt.%), select metal lanthanum and mixed rare earth MM (MM composition is Ce: 50%, La: 30%, Pr: 4%, Nd: 16%), iron, iron boron and other metals are placed in the crucible and It is filled with argon for smelting, and then poured onto a copper roller with a rotating speed of 3m / s to prepare a quick-setting thin strip with a thickness of 0.2-0.5mm.

[0033] 2) Hydrogen explosion, using a vacuum rotary hydrogen crushing furnace to carry out hydrogen explosion treatment on the quick-setting thin strips to obtain particles of uniform size.

[0034] 3) Jet milling, orientation pressing and isostatic pressing: put the hydrogen explosion particles in the jet mill, use high-pressure inert gas, and carry out jet milling treatment at 6-9 atm to prepare magnetic powder with an average particle size of 3 μm, and then Orientation pres...

Embodiment 2

[0039] 1) Melting ingots and quick-setting tablets: according to the nominal composition La 10 MM 21.5 Fe 66.1 M(Al 0.3 Cu 0.2 co 0.2 Ga 0.5 Zr 0.2 )B 1

[0040] (wt.%), select metal lanthanum and mixed rare earth MM (MM composition is Ce: 50%, La: 30%, Pr: 4%, Nd: 16%), iron, iron boron and other metals are placed in the crucible and It is filled with argon for smelting, and then poured onto a copper roller with a rotational speed of 5m / s to prepare a quick-setting thin strip with a thickness of 0.2-0.5mm.

[0041] 2) Hydrogen explosion, using a vacuum rotary hydrogen crushing furnace to carry out hydrogen explosion treatment on the quick-setting thin strips to obtain particles of uniform size.

[0042] 3) Jet milling, orientation pressing and isostatic pressing: put the hydrogen explosion particles in the jet mill, use high-pressure inert gas, and carry out jet milling treatment at 6-9 atm to prepare magnetic powder with an average particle size of 5 μm, and then O...

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Abstract

The invention relates to a preparation method of a mischmetal ferroboron magnet for inhibiting a CeFe2 phase and belongs to the technical field of preparation of rare earth magnetic materials. The nominal component of the magnet is LaxMMyFe100-x-y-z-1MzB1 (x and y is larger than or equal to 20 and smaller than or equal to 40, x is larger than or equal to 4 and smaller than or equal to 10, z is larger than or equal to 0.1 and smaller than or equal to 2, the unit is wt.%), MM is mischmetal and comprises 48-58% of Ce, 20-30% of La, 4-6% of Pr and 15-17% of Nd, and M is one or more kinds of Nb, Ti, V, Co, Cr, Mn, Ni, Zr, Ga, Ag, Ta, Al, Au, Pb, Cu and Si. According to the preparation method, MM is replaced by La, the low-cost magnet is prepared, and meanwhile when MM is replaced by a certain amount of La, the CeFe2 soft magnetic phase in the magnet can be removed. The cost of sintering the magnet is lowered under the situation of improving the magnetic performance of the magnet, the marketrequirement is met, and comprehensive utilization of rare earth resources is achieved.

Description

technical field [0001] The invention provides a method for inhibiting CeFe 2 The invention discloses a preparation method of a mixed rare-earth iron-boron magnet, belonging to the technical field of preparation of rare-earth magnetic materials. Background technique [0002] Because of its excellent magnetic properties, sintered NdFeB is widely used in various fields and is closely related to people's lives. At the same time, sintered NdFeB is an ideal material for manufacturing high-efficiency, small-volume, and light-weight magnetic functional devices, and is expected to have a revolutionary impact on many application fields. However, with the advancement of science and technology, the demand has also increased rapidly, which has seriously reduced the rare earth raw material reserves of NdFeB permanent magnet materials, and at the same time the price has risen accordingly. Therefore, it is urgent to find a permanent magnet with magnetic properties that can meet market req...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01F1/057H01F41/02
Inventor 刘卫强张志鹏岳明李智张东涛张红国
Owner BEIJING UNIV OF TECH
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