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Rare earth permanent magnet material and preparation method thereof

A technology of rare earth permanent magnets and magnets, which is applied in the fields of magnetic materials, metal material coating technology, inductance/transformer/magnet manufacturing, etc., can solve the problems of limited coercive force improvement, low efficiency, waste of heavy rare earth metals, etc., and achieve Significant coercive force, high efficiency, and reduced heavy rare earth content

Active Publication Date: 2018-06-19
ADVANCED TECHNOLOGY & MATERIALS CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the efficiency of evaporation or sputtering in mass production is low. During the evaporation process, a large amount of rare earth metals are scattered in the heating furnace chamber, resulting in unnecessary waste of heavy rare earth metals.
However, when the surface is coated with a single rare earth oxide or fluoride and heated and diffused, there is a problem of limited coercive force improvement.

Method used

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  • Rare earth permanent magnet material and preparation method thereof

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] (1) According to the powder composition formula (TbF 3 ) 95 Nd 2 al 3 (The suffix in the formula is the atomic percentage of the corresponding element) Composite powder configuration: take TbF3 powder (particle size: -150 mesh), metal Nd powder (particle size: -150 mesh), metal Al powder (particle size: -150 mesh) , mix the above powders evenly, pass through a 150-mesh sieve, and take the undersize as a composite powder, wherein the powder mixing and sieving process is carried out under a nitrogen environment.

[0035] (2) NdFeB commercial magnetic powder (ingredient distribution ratio: Nd 9.2 PR 3 Dy 1.2 Tb 0.6 Fe 80 B 6 , where the subscript is the atomic percentage of the corresponding component) is loaded into a cemented carbide mold, and at the same time, a 20 μm thick composite powder configured in step (1) is laid on the surface layer perpendicular to the orientation, using spark plasma sintering technology, in a vacuum 10 -3 pa, pressure 30Mpa, hot pre...

Embodiment 2

[0041] (1) According to the powder ratio formula (DyF 3 ) 95 Nd 1 al 4 (The subscript in the formula is the atomic percent of corresponding element) configures composite powder. Weigh DyF 3 Powder, -150 mesh; metal Nd powder, -150 mesh; metal Al powder, -150 mesh; mix the above powders evenly, and sieve through 150 mesh, and the powder mixing and sieving process is carried out under nitrogen environment.

[0042] (2) NdFeB commercial magnetic powder (ingredient distribution ratio: Nd 10.8 PR 3 Tb 0.4 Fe 79.8 B 6 , where the subscript is the atomic percentage of the corresponding component) into a cemented carbide mold, and at the same time lay the powder described in (1) with a thickness of 25 μm on the surface layer in the vertical direction, using spark plasma sintering technology, in a vacuum of 10 -3 pa, pressure 30Mpa, hot pressing at 750°C to obtain surface curing adhesion (DyF 3 ) 95 Nd 1 A l4 NdFeB magnet with powder solidification layer; the orientation d...

Embodiment 3

[0048] (1) According to the powder ratio formula (TbF 3 ) 95 Cu 5 (The subscript in the formula is the atomic percent of corresponding element) configures composite powder. Weigh TbF 3 Powder, -150 mesh; Metal Cu powder, -150 mesh; Mix the above powders evenly, and sieve through 150 mesh, and the powder mixing and sieving process is carried out under nitrogen environment.

[0049] (2) NdFeB commercial magnetic powder (ingredient distribution ratio: Nd 11.9 PR 3 Dy 0.1 Fe 79 B 6 , where the subscript is the atomic percentage of the corresponding component) into a cemented carbide mold, and at the same time lay the powder described in (1) with a thickness of 30 μm on the surface layer oriented vertically, using spark plasma sintering technology, vacuum 10 -3 pa, pressure 50Mpa, hot pressing at 780°C to obtain surface curing adhesion (TbF 3 ) 95 Cu 5 NdFeB magnet with powder solidification layer; the orientation direction is 12mm thick.

[0050] (3) The magnet that th...

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Abstract

The invention discloses a rare earth permanent magnet material and a preparation method thereof. The method comprises the steps of sintering treatment, diffusion heat treatment and tempering; during sintering treatment, composite powder for diffusion is laid on the surface of a neodymium-iron-boron magnetic powder layer and subjected to spark plasma sintering treatment, a neodymium-iron-boron magnetic body with a diffusion layer solidified on the surface is obtained, wherein the proportional expression of components of the composite powder for diffusion is H100-x-yMxQy, H is one or more of Dy,Tb, Ho and Gd metal powder, fluoride powder or oxide powder, M is Nd or Pr or Nd and Pr metal powder, and Q is one or more of Cu metal powder, Al metal powder, Zn metal powder and Sn metal powder; xis the atomic percent of the M component in the composite powder for diffusion, y is the atomic percent of the Q component in the composite powder for diffusion, x is within 0-20, and y is within 0-40. The preparation method is high in efficiency, good in diffusion effect and low in use amount of heavy rare earth.

Description

technical field [0001] The invention belongs to the technical field of rare earth permanent magnet materials, and in particular relates to a rare earth permanent magnet material and a preparation method thereof. The method adopts integrated technologies of pressing, plasma sintering and grain boundary diffusion, and adopts less amount of heavy rare earth to achieve remarkable magnet performance. Improve and high-quality use of heavy rare earths. Background technique [0002] Sintered NdFeB rare earth permanent magnet is the most magnetic permanent magnet material so far. It is widely used in many fields such as electronics, electromechanical, instrumentation and medical treatment. It is the fastest growing permanent magnet material with the best market prospect in the world today. With the rapid development of hybrid vehicles, high-temperature permanent magnets with an operating temperature above 200 °C are required. Therefore, higher requirements are placed on the high-temp...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01F41/02H01F1/057
CPCH01F1/0577H01F41/0266H01F41/0293C23C10/30C23C10/02C23C10/60B22F3/105B22F3/24B22F2003/1051B22F2003/248B22F2301/355C22C38/005C22C2202/02H01F1/057C23C12/02B22F2304/10C22C32/001C22C32/00
Inventor 周磊刘涛程星华喻晓军
Owner ADVANCED TECHNOLOGY & MATERIALS CO LTD
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