Cerium-rich rare earth permanent magnet using yttrium and preparation method thereof

A cerium-rich rare earth and permanent magnet technology, applied in magnetic objects, inductance/transformer/magnet manufacturing, magnetic materials, etc., can solve the problem of yttrium element can not be used, to suppress the magnetic dilution effect, protect rare earth resources, and realize the cost of raw materials Effect

Active Publication Date: 2019-02-05
ZHEJIANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to overcome the deficiency that yttrium element cannot be applied to rare earth permanent magnets for a long time, and provide a cerium-rich rare earth permanent magnet using yttrium and a preparation method thereof

Method used

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preparation example Construction

[0017] The preparation method of the cerium-rich rare earth permanent magnet using yttrium is as follows:

[0018] 1) According to the design of the main phase components, the ingredients are separately prepared, and the vacuum degree is higher than 10 -2 Different main phase alloys are smelted in a vacuum intermediate frequency induction furnace in Pa, and different main phase alloy flakes with a thickness of 0.2-0.5 mm are obtained by using the quick-setting casting strip technology, and then prepared by hydrogen explosion and jet milling processes with an average particle size of 3-4 μm. Corresponding main phase alloy powder;

[0019] 2) Uniformly mixing the corresponding main phase alloy powders according to the ratio to obtain mixed main phase powders with different Y-Ce substitution amounts;

[0020] 3) Orienting and pressing the mixed main phase powder under a magnetic field of 1.5-2T to obtain a green body;

[0021] 4) Vacuum-encapsulate the green body obtained, cold...

Embodiment 1

[0024] 1) In terms of mass percentage, the composition is [(Y 0.2 Ce 0.8 ) 0.5 Nd 0.5 ] 30.5 Fe 67.11 co 0.8 Zr 0.59 B 1 The main phase A and Nd 30.5 Fe 67.11 co 0.8 Zr 0.59 B 1 The main phase B is batched separately, and the vacuum degree is higher than 10 -2 After smelting in a vacuum intermediate frequency induction furnace in Pa, the corresponding main phase flakes with a thickness of 0.31mm are obtained by using the quick-setting casting belt technology;

[0025] 2) Prepare the corresponding alloy powder with an average particle size of 3.3 μm by subjecting the corresponding main phase flakes to hydrogen explosion and jet milling;

[0026] 3) After uniformly mixing the A and B main phase alloy powders according to the mass ratio of 3:7, under the protection of nitrogen, the mixed main phase powders are oriented and formed under a magnetic field of 2T, and are made into a green body by 17MPa cold isostatic pressing;

[0027] 4) Put the green body in a vacuum ...

Embodiment 2

[0037] 1) In terms of mass percentage, the composition is [(Y 0.25 Ce 0.75 ) 0.6 Nd 0.4 ] 30.2 Fe 67.45 co 0.8 Ga 0.55 B 1 The main phase A, the composition is [(Y 0.25 Ce 0.75 ) 0.4 Nd 0.6 ] 30.2 Fe 67.45 co 0.8 Ga 0.55 B 1 The main phase is B and the composition is Nd 30.2 Fe 67.45 co 0.8 Ga 0.55 B 1 The main phase C is batched separately, and the vacuum degree is higher than 10 -2 After smelting in Pa's vacuum intermediate frequency induction furnace, the corresponding main phase flakes with a thickness of 0.33mm are obtained by using the quick-setting casting belt technology;

[0038] 2) Prepare the corresponding alloy powder with an average particle size of 3.1 μm by subjecting the corresponding main phase flakes to hydrogen explosion and jet milling;

[0039] 3) After the main phase alloy powders of A, B and C are uniformly mixed according to the mass ratio of 2:2:1, the mixed main phase powder is oriented and formed under a magnetic field of 2T und...

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Abstract

The invention discloses a cerium-rich rare earth permanent magnet applying yttrium and a preparation method of the permanent magnet. The prepared rare earth permanent magnet contains a RE-Fe-B principle phase and one or more yttrium-added cerium-rich principle phases. After different main phases are subjected to ingredient design, blending and flour milling separately, the corresponding main phase alloy powder is uniformly mixed in proportion, then, magnetic field profiling, sintering and heat treatment are conducted, and the rare earth permanent magnet which is of a multiple principle phase structure is obtained. By optimizing a sintering and heat treatment technology, the magnetic dilution effect is relieved, and the comprehensive magnetic performance of the magnet is improved. Accordingly, a large amount of application of the yttrium element in the rare earth permanent magnet is achieved, the performance of the permanent magnet can meet the commercial standard, the cost of the raw materials is lowered, and meanwhile the market requirements are met.

Description

technical field [0001] The invention relates to a cerium-rich rare earth permanent magnet using yttrium and a preparation method thereof Background technique [0002] In recent years, due to the extensive attention of researchers at home and abroad, great progress has been made in the preparation of Ce-rich rare earth permanent magnets prepared by replacing part of Nd (neodymium) elements with Ce (cerium) elements. Although Ce 2 Fe 14 The intrinsic magnetic properties of B (saturation magnetic polarization J S =1.17T, magnetocrystalline anisotropy field H A =26kOe) than Nd 2 Fe 14 The intrinsic magnetic properties of B (saturation magnetic polarization J S =1.60T, magnetocrystalline anisotropy field H A =73kOe) is much weaker, but the researchers optimized the preparation process and changed the traditional preparation method, which greatly weakened the serious magnetic dilution effect of Ce added to the NdFeB magnet. As another kind of rare earth element Y (yttrium)...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01F1/057H01F41/02
CPCH01F1/0573H01F1/0576H01F1/0577H01F41/0266
Inventor 严密彭白星金佳莹马天宇
Owner ZHEJIANG UNIV
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