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Cerium rare earth permanent magnet material and preparation method thereof

A rare-earth permanent magnet and rare-earth permanent magnet technology, applied in the direction of magnetic materials, magnetic objects, electrical components, etc., can solve the problems of reducing material costs, improve product competitiveness, increase the proportion of addition, and reduce material costs Effect

Active Publication Date: 2018-10-12
NINGBO KETIAN MAGNET
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] CN105575577A proposes a sintered rare-earth-rich permanent magnet material, which requires at least one rare-earth element in Dy, Tb, Gd, and Ho to be included in the Nd-based alloy when using Ce to replace Nd in the rare-earth alloy. Since Dy, Tb, Gd, and Ho are all precious metal heavy rare earth elements, even if the magnetic properties of cerium-rich rare earth permanent magnet materials can be improved, the purpose of reducing material cost cannot be achieved

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  • Cerium rare earth permanent magnet material and preparation method thereof

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] 1) Alloy composition

[0022] Ce main phase alloy composition is Nd 28.5 co 1.0 Al 0.2 B 1.05 Fe 余量 ;

[0023] Grain boundary Ce alloy composition: Ce 70 Fe 20 co 5 Cu 5 ;

[0024] Composition control: the method of directly adding an appropriate amount of Ce to the main phase combined with the addition of Ce at the grain boundary, the direct addition of the main phase is: (Ce x Re 1-x ) y co 0.5 Cu 0.2 Al 0.4 Fe 余量 B 0.95 (wt%), wherein Re is a rare earth element containing at least Nd, and Ce is added directly in the main phase, which inevitably enters the main phase and causes a significant drop in magnetic properties, so it is necessary to control the amount of addition, 0≤x≤15wt%, while ensuring that the main The phase ratio is as high as possible, and y needs to be close to the main phase composition, so 28.5wt%≤y≤30.5wt%, the Ce alloy composition added to the grain boundary is Ce z Fe 余量 m 15 (wt%), 50wt%≤z≤70wt%, M is added Cu, Co, Al metal e...

Embodiment 2

[0040] 1) Alloy composition

[0041] Ce main phase alloy composition (Ce 10 Nd 90 ) 30.5 co 1.0 Cu 0.2 al 0.4 B 1.05 Fe 余量 ;

[0042] Grain Boundary Ce Alloy Composition Ce 50 Fe 35 co 5 Cu 4 al 6 ;

[0043] 2) Quick-setting cast sheet

[0044] Ce main phase alloy (Ce 10 Nd 90 ) 30.5 co 1.0 Cu 0.2 al 0.4 B 1.05 Fe 余量 The quick-setting process is adopted, and the casting temperature according to the addition ratio of Ce is: 1425°C;

[0045] Grain Boundary Ce Alloy Ce 50 Fe 35 co 5 Cu 4 al 6 Smelting and quick-setting cast pieces;

[0046] 3) Diffusion treatment

[0047] Ce main phase alloy according to (Ce 10 Nd 90 ) 30.5 co 1.0 Cu 0.2 al 0.4 B 1.05 Fe 余量 and grain boundary Ce alloy Ce 50 Fe 35 co 5 Cu 4 al 6 , mixed at a ratio of 95:5, the mixed alloy was diffused at 800°C for 10 hours, and the vacuum degree of diffusion treatment was controlled at 2*10 -2 Pa;

[0048] 4) Pulverization, orientation molding

[0049] After the diffusi...

Embodiment 3

[0055] 1) Alloy composition

[0056] Ce main phase alloy composition (Ce 15 Nd 85 ) 29 co 0.5 al 0.2 Cu 0.1 B 1.0 Fe 余量 ;

[0057] Grain Boundary Ce Alloy Composition Ce 50 Fe 35 co 5 Cu 4 al 6

[0058] 2) Quick-setting cast sheet

[0059] Ce main phase alloy (Ce 15 Nd 85 ) 29 co 0.5 al 0.2 Cu 0.1 B 1.0 Fe 余量 The quick-setting process is adopted, and the casting temperature according to the addition ratio of Ce is: 1410°C;

[0060] Grain Boundary Ce Alloy Ce 50 Fe 35 co 5 Cu 4 al 6 Melting, quick-setting casting

[0061] 3) Diffusion treatment

[0062] Ce main phase alloy (Ce 15 Nd 85 ) 29 co 0.5 al 0.2 Cu 0.1 B 1.0 Fe 余量 and grain boundary Ce alloy Ce 50 Fe 35 co 5 Cu 4 al 6 Mix according to the ratio of 90:10, the mixed alloy cast sheet is 4*10 -2 Diffusion treatment at 720°C for 12 hours under vacuum condition of Pa;

[0063] 4) Pulverization, orientation molding

[0064] After the above-mentioned alloy diffusion treatment, carry...

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Abstract

A rare earth permanent magnetic material comprises Ce base phase alloy which is expressed by weight percentage as (CexRe1-x)yCo0.5Cu0.2Al0.4FebalanceB0.95, wherein x is larger than or equal to 0 and less than or equal to 15wt%, and y is larger than or equal to 28.5wt% and less than or equal to 30.5wt%. The rare earth permanent magnetic material further comprises grain boundary Ce alloy which is expressed by weight percentage as CezFebalanceM15, wherein z is larger than or equal to 50wt% and less than or equal to 70wt%, and M represents added elements of Cu, Co and Al. A preparation method of the rare earth permanent magnetic material includes: respectively compounding and smelting the Ce base phase alloy and the grain boundary Ce alloy by component ratio and respectively coagulating the Ce base phase alloy and the grain boundary Ce alloy rapidly for obtaining casting strips; mixing the Ce base phase alloy and the grain boundary Ce alloy in proportion, and keeping heat diffusion treatment for 4-25h at 500-900 DEG C in vacuum or pressurized argon environment; performing oriented molding after performing hydrogen demolishing and airflow powder grinding on the mixed casting strips after the heat diffusion treatment, and sintering the mixed casting strips into a permanent magnet. The heat diffusion treatment guarantees that Ce is gathered in a grain boundary as much as possible, guarantees performance of the magnet, increases an adding proportion of the Ce, reduces material cost, and improves product competitiveness.

Description

technical field [0001] The invention relates to a cerium rare earth permanent magnet material and a preparation method thereof. Background technique [0002] Cerium Ce is one of the rare earth elements with the largest reserves found in the earth's crust, and its price is lower than that of neodymium Nd. Therefore, if the development of Ce to replace Nd to prepare rare earth permanent magnet materials can not only reduce the cost of materials, but also achieve the purpose of balanced utilization of resources and sustainable development. But due to: 1) Ce 2 Fe 14 B compared to Nd 2 Fe 14 The saturation magnetic polarization J of B s and the anisotropy field H A Both are significantly reduced, adding Ce instead of Nd to prepare rare earth permanent magnet materials will lead to a sharp drop in magnetic properties; 2) Ce 2 Fe 14 B compared to Nd 2 Fe 14 Phase B is more difficult to form, and it is also easier to decompose, resulting in deterioration of magnetic proper...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01F1/053C22C30/02
CPCC22C30/02H01F1/0536
Inventor 徐峰严长江王育平
Owner NINGBO KETIAN MAGNET
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