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Hybrid preparation method of high-performance sintered NdFeB permanent magnet

A neodymium-iron-boron, permanent magnet technology, applied in the manufacture of inductors/transformers/magnets, electrical components, circuits, etc., can solve the problems of low performance indicators of magnets, difficult to overcome α-Fe, segregation of main phase components, etc. The effect of remanence and magnetic energy product to avoid segregation of main phase components

Active Publication Date: 2011-10-19
内蒙古北方众恒磁谷新材料有限公司
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  • Description
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  • Application Information

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Problems solved by technology

[0006] The purpose of the present invention is to overcome the above disadvantages of the prior art, that is, it is difficult to overcome the generation of α-Fe by ingot casting process cooling after smelting, and the main phase component segregation is caused by the metastable crystallization process, so the magnet performance index Relatively low problem, providing a hybrid preparation method of high-performance sintered NdFeB permanent magnets

Method used

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  • Hybrid preparation method of high-performance sintered NdFeB permanent magnet

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Experimental program
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Effect test

Embodiment 1

[0017] To prepare a formula of Nd 30 B 0.95Al 0.4 Fe 68.65 (all the following ratios are weight percentages), first use the existing strip stripping process, smelt and strip the raw materials according to the above proportions, the main phase and The neodymium-rich phase is formed at the same time, and then the main phase and the neodymium-rich phase alloy are subjected to hydrogen crushing, jet milling, magnetic field orientation, pressing, sintering, and tempering.

[0018] Then adopt the method described in the present invention to make a magnet: the main phase and the neodymium-rich phase are designed separately, the raw material ratio of the main phase is Nd29.5 B 0.95Fe 69.55, and after smelting, it is cooled by stripping technology, hydrogen crushing, and air-flow milling The ratio of Nd54.5 B0.95Al 20 Fe 24.55 is Nd54.5 B0.95Al 20 Fe 24.55. After smelting, the ingot casting process is used for cooling, hydrogen crushing, and jet milling. After that, the main phase and N...

Embodiment 2

[0026] A formula is prepared as Nd 30 Dy 0.8 B 1.0 Co 0.5 Cu 0.25 Fe 67.45. First, the existing stripping process is adopted, and the raw materials are smelted and stripped according to the above ratio. The main phase is formed at the same time as the rich neodymium, and then The main phase and neodymium-rich phase alloy are subjected to hydrogen crushing, jet milling, magnetic field orientation, pressing, sintering and tempering.

[0027] Then adopt the method described in the present invention to obtain a magnet: the main phase and the Nd-rich phase are designed separately, the raw material ratio of the main phase is Nd30 B 1.0 Fe 69, and after smelting, the belt-slinging process is used for cooling, hydrogen crushing, and air-flow milling; The neodymium phase ratio is Nd 30 Dy 16 B 1.0Co 10 Cu 5 Fe 38. After smelting, the ingot casting process is used for cooling, hydrogen crushing, and jet milling. After that, the main phase and neodymium-rich phase powder are mixed in a ra...

Embodiment 3

[0035] A formula is prepared as Nd 28 Pr 1.8 B 1.2 Ga 0.2 Nb 0.4 Fe 68.4. Firstly, the existing stripping process is adopted, and the raw materials are smelted and stripped according to the above ratio. The main phase is formed at the same time as Nd-rich, and then The main phase and neodymium-rich phase alloy are subjected to hydrogen crushing, jet milling, magnetic field orientation, pressing, sintering and tempering.

[0036] Then adopt the method described in the present invention to make a magnet: the main phase and the Nd-rich phase are designed separately, the raw material ratio of the main phase is Nd28 B 1.2 Fe70.8, and after smelting, it is cooled by strip-spinning process, hydrogen crushing, and air-flow milling; The ratio of Nd 28 Pr 22.5 B 1.2 Ga 2.5 Nb 5 Fe40.8 is Nd 28 Pr 22.5 B 1.2 Ga 2.5 Nb 5 Fe40.8. After smelting, the ingot casting process is used for cooling, hydrogen crushing, and jet milling, and then the main phase and Nd rich phase powder are mixed accor...

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Abstract

The invention relates to a preparation method of sintered NdFeB, in particular to a hybrid preparation method of a high-performance sintered NdFeB permanent magnet. By means of the method, the problems that magnet performance indexes are relatively lower as the generation of alpha-Fe is difficult to overcome in the conventional process for ingot casting after smelting, and the main phase composition segregation is brought on by a metastable crystallization in a strip casting process for cooling are solved. The hybrid preparation method provided by the invention comprises the steps of separately designing a main phase and Nd-rich phase, wherein the main phase is prepared through smelting the raw materials in percentage by weight: 28-30% of Nd, 0.95-1.2% of B and the balance of Fe and adopting the strip casting process for cooling, hydrogen decrepitation and jet milling, and the Nd-rich phase is prepared through smelting the raw materials in percentage by weight: 46-54.5% of R, 0.95-1.2% of B. 7.5-20% of M and the balance of Fe and adopting an ingot casting process for cooling, hydrogen decrepitation and jet milling; mixing the main phase and Nd-rich phase powders according to a proportion of (92-98%):(2-8%); and finally, carrying out magnetic field orientation, compression moulding, sintering and tempering on the mixed magnetic powders.

Description

technical field [0001] The invention relates to a preparation method of sintered NdFeB, in particular to a mixed preparation method of high-performance sintered NdFeB permanent magnets. Background technique [0002] Neodymium iron boron (chemical name Nd-Fe-B) permanent magnet material is the third generation of rare earth permanent magnet. , machinery, energy, medical equipment and many other fields. Sintered Nd-Fe-B permanent magnet materials occupy an important position in Nd-Fe-B permanent magnet materials. [0003] The sintered Nd-Fe-B permanent magnet material has a multi-phase structure, and the theoretical main phase in the magnet is Nd 2 Fe 14 B, The excellent remanence and energy product of the magnet depend on this phase. In addition, there is a certain amount of neodymium-rich phase, which is a thin-layer grain boundary phase dispersed around the main phase grains, and its existence and distribution have a decisive impact on the coercive force of the magnet. ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22F1/00B22F3/16B22F9/04C22C38/00H01F41/02
Inventor 高志翔张宝权
Owner 内蒙古北方众恒磁谷新材料有限公司
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