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A kind of y-containing high-abundance rare earth permanent magnet and its preparation method

A rare earth permanent magnet, high abundance technology, used in magnetic objects, inductor/transformer/magnet manufacturing, magnetic materials, etc., can solve the problems of reduced coercivity and remanence, deterioration of magnet microstructure, etc., to compensate for coercivity Loss of force, effect of enhanced anisotropy field

Active Publication Date: 2020-07-14
NINGBO INST OF MATERIALS TECH & ENG CHINESE ACADEMY OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This is due to Ce 2 Fe 14 Intrinsic properties of B (H a =26kOe, 4πM s =11.7kGs) is much lower than Nd 2 Fe 14 Intrinsic properties of B (H a =73kOe, 4πM s =16.0kGs); at the same time, after Ce replaces Nd, the microstructure of the magnet deteriorates significantly, which is also the reason for the significant decrease in coercive force and remanence

Method used

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  • A kind of y-containing high-abundance rare earth permanent magnet and its preparation method
  • A kind of y-containing high-abundance rare earth permanent magnet and its preparation method
  • A kind of y-containing high-abundance rare earth permanent magnet and its preparation method

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Effect test

Embodiment 1

[0038] In this embodiment, the high-abundance rare earth permanent magnet is expressed in mass percent, and its nominal composition is: [Nd 0.5 Ce 0.5 ] 30.5 Al 0.1 Cu 0.1 Fe 68.3 B 1 .

[0039] The preparation method of the high-abundance rare earth permanent magnet is as follows:

[0040] 1) Accelerated solidification: After grinding the master alloy with a good ratio, put it into the rapid solidification furnace for melting. The main parameters in the melting step are: the melting temperature is controlled at 1350 °C, the speed of the copper roll is kept at 1.2m / s during melting, and through The average thickness of the master alloy quick-setting sheet obtained by the quick-setting process is 0.3-0.5mm;

[0041] 2) Hydrogen breaking: place the obtained quick-setting sheet in a hydrogen breaking furnace, and absorb hydrogen under a hydrogen pressure of 0.2-0.25MPa; then, dehydrogenate fully at 550°C for a long time, and break the quick-setting sheet into 100-150μm Arou...

Embodiment 2

[0048] In this embodiment, the high-abundance rare earth permanent magnet is expressed in mass percent, and its nominal composition is: [Nd 0.5 (Ce 0.45 Y 0.05 )] 30.5 al 0.1 Cu 0.1 Fe 68.3 B 1 .

[0049] The preparation method of the high-abundance rare earth permanent magnet is as follows:

[0050] 1) Accelerated solidification: After grinding the master alloy with a good ratio, put it into the rapid solidification furnace for melting. The main parameters in the melting step are: the melting temperature is controlled at 1350 °C, the speed of the copper roll is kept at 1.2m / s during melting, and through The average thickness of the master alloy quick-setting sheet obtained by the quick-setting process is 0.3-0.5mm;

[0051] 2) Hydrogen breaking: place the obtained quick-setting sheet in a hydrogen breaking furnace, and absorb hydrogen under a hydrogen pressure of 0.2-0.25MPa; then, dehydrogenate fully at 550°C for a long time, and break the quick-setting sheet into 10...

Embodiment 3

[0058] In this embodiment, the high-abundance rare earth permanent magnet is expressed in mass percent, and its nominal composition is: [Nd 0.5 (Ce 0.4 Y 0.10 )] 30.5 al 0.1 Cu 0.1 Fe 68.3 B 1 .

[0059] The preparation method of the high-abundance rare earth permanent magnet is as follows:

[0060] 1) Accelerated solidification: After grinding the master alloy with a good ratio, put it into the rapid solidification furnace for melting. The main parameters in the melting step are: the melting temperature is controlled at 1350 °C, the speed of the copper roll is kept at 1.2m / s during melting, and through The average thickness of the master alloy quick-setting sheet obtained by the quick-setting process is 0.3-0.5mm;

[0061] 2) Hydrogen breaking: place the obtained quick-setting sheet in a hydrogen breaking furnace, and absorb hydrogen under a hydrogen pressure of 0.2-0.25MPa; then, dehydrogenate fully at 550°C for a long time, and break the quick-setting sheet into 100...

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Abstract

The invention provides a Y-contained high-abundance rare earth permanent magnet. The magnet comprises RealphaYbetaBgammaMxNyFe100-alpha-beta-gamma-x-y, wherein Re includes at least Nd and Ce; M is selected from Co and / or Cu; N is one or more elements selected from a group consisting of Nb, Ti, Zn, Ga, Al, Zr, Sn, Sb, Ta and W; alpha, beta, gamma, x and y are weight percentages of the respective elements, 23 <=alpha <=35, 0 < beta<=10, 0.95 <=gamma <=1.2, 0 <=x <=2, and 0 <=y <=2; the main phase grain of the Y-contained high-abundance rare earth permanent magnet is of a core-shell structure, element Y is more distributed at the core, Ce and Nd are more distributed in a shell layer, so that the loss of coercive force caused by the addition of Ce in Nd-Fe-B is compensated, and meanwhile temperature stability of use is improved.

Description

technical field [0001] The invention belongs to the field of preparation of rare earth permanent magnet materials, in particular to a Y-containing high-abundance rare earth permanent magnet and a preparation method thereof. Background technique [0002] The rare earth NdFeB permanent magnet material was developed in the early 1980s. It is called the "Magnetic King" because of its extremely high coercive force and the largest magnetic energy product. Various industries of the national economy such as automobiles are widely used. [0003] Up to now, light rare earth elements Nd, Pr and heavy rare earth elements Dy, Tb, etc. are still widely used in the preparation of NdFeB permanent magnets. On the one hand, due to the high price of light rare earth elements Nd, Pr and heavy rare earth elements Dy, Tb, etc., the price of NdFeB magnets remains high; on the other hand, the content of rare earth elements in the earth's crust is arranged in order of Ce, Y , La, Nd, Pr, Sm, Gd, D...

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 范晓东郭帅陈侃陈仁杰闫阿儒李东
Owner NINGBO INST OF MATERIALS TECH & ENG CHINESE ACADEMY OF SCI
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