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Y-contained high-abundance rare earth permanent magnet and preparation method thereof

A rare earth permanent magnet, high abundance technology, applied in magnetic objects, inductance/transformer/magnet manufacturing, magnetic materials, etc. Anisotropic field, effect of compensating for loss of coercivity

Active Publication Date: 2018-06-12
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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  • Y-contained high-abundance rare earth permanent magnet and preparation method thereof
  • Y-contained high-abundance rare earth permanent magnet and preparation method thereof
  • Y-contained high-abundance rare earth permanent magnet and preparation method thereof

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Embodiment 1

[0038] In this embodiment, the high-abundance rare-earth permanent magnet is calculated 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) Quick-setting: After grinding, the well-proportioned master alloy is put into the quick-setting furnace for smelting. The main parameters in the smelting step are: the smelting temperature is controlled at 1350 ℃, and the speed of the copper roll is kept at 1.2m / s during smelting. The average thickness of the master alloy quick-setting sheet obtained by the quick-setting process is 0.3-0.5 mm;

[0041] 2) Hydrogen breaking: the obtained quick-setting sheet is placed in a hydrogen breaking furnace, and hydrogen is absorbed under a hydrogen pressure of 0.2-0.25 MPa; then, fully dehydrogenated at 550 ° C for a long time, and the quick-setting sheet is broken into 100-150 μm Alloy coa...

Embodiment 2

[0048] In this embodiment, the high-abundance rare-earth permanent magnet is calculated 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) Quick-setting: After grinding, the well-proportioned master alloy is put into the quick-setting furnace for smelting. The main parameters in the smelting step are: the smelting temperature is controlled at 1350 ℃, and the speed of the copper roll is kept at 1.2m / s during smelting. The average thickness of the master alloy quick-setting sheet obtained by the quick-setting process is 0.3-0.5 mm;

[0051] 2) Hydrogen breaking: the obtained quick-setting sheet is placed in a hydrogen breaking furnace, and hydrogen is absorbed under a hydrogen pressure of 0.2-0.25 MPa; then, fully dehydrogenated at 550 ° C for a long time, and the quick-setting sheet is broken into 100-150 ...

Embodiment 3

[0058] In this embodiment, the high-abundance rare-earth permanent magnet is calculated 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) Quick-setting: After grinding, the well-proportioned master alloy is put into the quick-setting furnace for smelting. The main parameters in the smelting step are: the smelting temperature is controlled at 1350 ℃, and the speed of the copper roll is kept at 1.2m / s during smelting. The average thickness of the master alloy quick-setting sheet obtained by the quick-setting process is 0.3-0.5 mm;

[0061] 2) Hydrogen breaking: the obtained quick-setting sheet is placed in a hydrogen breaking furnace, and hydrogen is absorbed under a hydrogen pressure of 0.2-0.25 MPa; then, fully dehydrogenated at 550 ° C for a long time, and the quick-setting sheet is broken into 100-150 μ...

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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 rare earth permanent magnet containing Y with high abundance and a preparation method thereof. Background technique [0002] The rare earth NdFeB permanent magnet material was developed in the early 1980s and is known as the "Magnetic King" because of its extremely high coercivity and maximum magnetic energy product. It is widely used in various industries of the national economy such as automobiles. [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 prices of light rare earth elements Nd, Pr and heavy rare earth elements Dy, Tb, etc., the price of NdFeB magnets remains high; , La, Nd, Pr, Sm, Gd, Dy, Tb..., and the large-scale use of rare earth permanent magnets makes Pr, Nd, Dy, Tb rapidly consu...

Claims

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Application Information

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Patent Type & Authority Applications(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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