Multi-main-phase Nd-Fe-B type permanent magnet with high crack resistance and high coercive force and preparation method thereof

A high coercivity, nd-fe-b technology, used in magnetic objects, inductance/transformer/magnet manufacturing, magnetic materials, etc., can solve the problem that mechanical properties cannot meet the new needs of application fields

Active Publication Date: 2016-01-13
CENT IRON & STEEL RES INST
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the magnets prepared by the above patents / patent applications are limited to two main phases, and the mechanical properties cannot meet the new requirements of the application field because the performance and structural advantages of different main phase magnets cannot be fully utilized.

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  • Multi-main-phase Nd-Fe-B type permanent magnet with high crack resistance and high coercive force and preparation method thereof
  • Multi-main-phase Nd-Fe-B type permanent magnet with high crack resistance and high coercive force and preparation method thereof
  • Multi-main-phase Nd-Fe-B type permanent magnet with high crack resistance and high coercive force and preparation method thereof

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preparation example Construction

[0067] The invention provides a high crack resistance, multi-main phase Nd-Fe-B type permanent magnet and its preparation method. According to the performance requirements of multi-hard magnetic main phase Nd-Fe-B permanent magnet alloy, the design is different Size, different distribution, different anisotropy field H A The main phase alloy of the main phase alloy determines the phase structure composition of a variety of different multi-hard magnetic main phase Nd-Fe-B type permanent magnets; in the final magnet, Nd is the rare earth element with the most content by mass percentage, and the method includes the following process steps:

[0068] (1) A variety of different hard magnetic main phase alloy raw materials are prepared respectively. These hard magnetic main phases all have a 2:14:1 structure and are composed of the following three types of main phases:

[0069] I) (Nd, Pr)-Fe-B phase: It is a permanent magnetic phase based on rare earth elements Nd and Pr, and does n...

Embodiment 1

[0080] Design composition (Nd 0.65 PR 0.20 Dy 0.09 Tb 0.06 ) 29.6 Fe 68 B 0.9 tm 1.5 (TM=Co, Cu, Nb).

[0081] (1) According to the alloy mass percentage composition (Nd 0.9 PR 0.1 ) 28.6 Fe 69.5 B 0.9 tm 1.0 , (Dy 0.9 PR 0.1 ) 31 Fe 66.1 B 0.9 tm 2 and Tb 30 Fe 67.1 B 0.9 tm 2 Prepare raw materials separately.

[0082] (2) Melt the prepared raw materials separately. The alloy without heavy rare earth is prepared into quick-setting thin strips and then hydrogen crushed, and the alloy containing heavy rare earth is made into quick-quenched thin strips and then hydrogen crushed, then dehydrogenated, and then passed through jet mill or high-energy ball mill to obtain coarse particles with different particle sizes. (Nd 0.9 PR 0.1 ) 28.6 Fe 69.5 B 0.9 tm 1.0 Magnetic powder, fine (Dy 0.9 PR 0.1 ) 31 Fe 66.1 B 0.9 tm 2 Magnetic powder, nanocrystalline Tb 30 Fe 67.1 B 0.9 tm 2 Magnetic powder etc.

[0083] (3) According to the equivalent compo...

Embodiment 2

[0089] Design composition (Nd 0.87 PR 0.1 Dy 0.03 ) 29 Fe 68.1 B 0.9 tm 2 (TM = Ga, Co, Cu, Nb).

[0090] (1) According to the alloy mass percentage composition Nd 29 Fe 68.1 B 0.9 tm 2 , Pr 29 Fe 68.1 B 0.9 tm 2 and Dy 29 Fe 68.1 B 0.9 tm 2 Prepare raw materials separately.

[0091] (2) Melt the prepared raw materials separately. The alloy without heavy rare earth is prepared into quick-setting thin strips and then hydrogen crushed, and the alloy containing heavy rare earths is prepared into quick-quenched thin strips and then hydrogen crushed, then dehydrogenated, and then passed through jet mill or high-energy ball mill to obtain different particle sizes. Coarse Nd 29 Fe 68.1 B 0.9 tm 2 Magnetic powder, fine Pr 29 Fe 68.1 B 0.9 tm 2 Magnetic powder, nanocrystalline Dy 29 Fe 68.1 B 0.9 tm 2 Magnetic powder etc.

[0092] (3) According to the equivalent composition (Nd 0.87 PR 0.1 Dy 0.03 ) 29 Fe 68.1 B 0.9 tm 2 (TM=Ga, Co, Cu, Nb), respe...

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Abstract

The invention pertains to the technical field of rare earth magnetically hard material, in particular to a multi-main-phase Nd-Fe-B type permanent magnet with high crack resistance and high coercive force and a preparation method thereof.A final magnet contains multiple differently-sized hard-magnetic main-phase particles having different anisotropic fields HA. Different main-phase particles account for different volume fractions and are differently distributed, wherein Nd denotes a red earth element having the most content based on the mass percent. According to mass percent, the chemical formula of the permanent magnet is expressed as (Dd, Re) aFe100-a-b-cBbTmc. By respective selection, different types of main-phase materials such as (Nd, Pr)-Fe-B, (PR, La, Ce)-Fe-B, (Dy, Tb, Ho, Gd, Er)-Fe-B in the ratio of 2:14:1 in order to prepare corresponding coarse magnetic powder, thin magnetic powder and magnetic nanocrystalline powder. Power is utilized for absorbing hydrogen and controlling oxygen. Liquid-phase sintering technology on the pressurized condition at low temperature is adopted for preparation. The multi-main-phase Nd-Fe-B type permanent magnet with high crack resistance and high coercive force and the preparation method thereof have following beneficial effects: a large piece of magnet does not easily have crack; crack resistance of the magnet is improved; high coercive force and high magnetic energy product are obtained; and the preparation technology is suitable for scale production in engineering.

Description

technical field [0001] The invention belongs to the technical field of rare earth permanent magnet materials, in particular to a multi-hard magnetic main phase Nd-Fe-B permanent magnet with high crack resistance and high coercive force and a preparation method thereof. Background technique [0002] So far, NdFeB, as the third generation rare earth permanent magnet material, has high remanence B r , high coercive force H cj , high energy product (BH) max It is still one of the key materials of modern science and technology, such as computer technology, information technology, aerospace technology, communication technology, transportation (automobile) technology, office automation technology, home appliance technology and human health and health care technology. alternative. With the expansion of high-tech application fields, the requirements for the performance indicators of rare earth permanent magnet materials are not only coercive force, remanence and magnetic energy pr...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01F1/057H01F41/02B22F3/14
Inventor 朱明刚俞能君李安华李卫朱琛瑶李岩峰石晓宁张文臣
Owner CENT IRON & STEEL RES INST
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