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High-strength tenacity agglomeration neodymium-iron-boron magnet reconstructed by crystal boundary phase and preparation method thereof

A high-strength toughness, NdFeB technology, applied in the field of high-strength toughness sintered NdFeB magnets and its preparation, can solve the problems of not meeting the application requirements, and achieve the effects of improving toughness, low cost, and simple process

Inactive Publication Date: 2008-12-17
ZHEJIANG UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the microscopic addition of elements cannot change the microscopic fracture mechanism of the magnet. Therefore, the change of the strength and toughness of the magnet is limited, and the magnet cannot fundamentally get rid of the nature of poor toughness. Application requirements in areas with strong shock and vibration

Method used

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  • High-strength tenacity agglomeration neodymium-iron-boron magnet reconstructed by crystal boundary phase and preparation method thereof
  • High-strength tenacity agglomeration neodymium-iron-boron magnet reconstructed by crystal boundary phase and preparation method thereof
  • High-strength tenacity agglomeration neodymium-iron-boron magnet reconstructed by crystal boundary phase and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] 1) Redesign of grain boundary phase alloy composition, the composition is Nd 15.3 Dy 2.4 Ti 35 Cu 13.1 al 34.2 (at%);

[0022] 2) The main phase alloy and the reconstructed grain boundary phase alloy were prepared separately. The main phase alloy is made of NdFeB ingot alloy by casting process, and its composition is Nd 13.12 Fe 80.69 B 5.73 (Dy 0.22 Ga 0.24 )(at%), reconstructed grain boundary phase alloy Nd 15.3 Dy 2.4 Ti 35 Cu 13.1 al 34.2 (at%) The quick quenching strip is made by the quick quenching process;

[0023] 3) Powder the main phase alloy and the reconstructed grain boundary phase alloy separately. The primary crushing is carried out by the jaw crusher, the secondary crushing is carried out by the secondary crusher, and then the powders with an average particle diameter of 4.3 μm and 2 μm are respectively made into powders by means of a jet mill under the protection of nitrogen;

[0024] 4) Evenly mix the reconstituted grain boundary phase ...

Embodiment 2

[0032] 1) Redesign of grain boundary phase alloy composition, the composition is Nd 12.58 Tb 2.6 co 10.13 mn 8.89 Cu 12.7 Zn 26.1 Ga 22.5 sn 4.5 (at%);

[0033] 2) Prepare the main phase alloy and the reconstructed grain boundary phase alloy separately. The main phase alloy is made of NdFeB flakes by quick-setting stripping process, and its composition is Nd 14.33 Fe 78.91 B 6 (Ga 0.36 Cu 0.2 Zr 0.2 )(at%), reconstructed grain boundary phase alloy Nd 12.58 Tb 2.6 co 10.13 mn 8.89 Cu 12.7 Zn 26.1 Ga 22.5 sn4.5 (at%) Ingot alloy made by casting process;

[0034] 3) Powder the main phase alloy and the reconstructed grain boundary phase alloy separately. The primary crushing is carried out by the jaw crusher, the secondary crushing is carried out by the secondary crusher, and then the powders with an average particle diameter of 3.5 μm and 1.5 μm are respectively made by ball milling under the protection of petroleum ether;

[0035] 4) Uniformly mix the recon...

Embodiment 3

[0043] 1) Redesign of grain boundary phase alloy composition, the composition is Nd 16.44 Ce 3.56 Nb 17.3 Ta 13.3 Si 4.4 Cu 9.7 Mg 9.7 In 5.6 al 20 (at%);

[0044] 2) The main phase alloy and the reconstructed grain boundary phase alloy were prepared separately. Both of them are made of NdFeB flakes by using the quick-setting stripping process, and their components are Nd 12.2 Fe 80.15 B 5.9 (Tb 0.31 co 1.24 Nb 0.2 )(at%) and Nd 16.44 Ce 3.56 Nb 17.3 Ta 13.3 Si 4.4 Cu 9.7 Mg 9.7 In 5.6 al 20 (at%);

[0045] 3) Powder the main phase alloy and the reconstructed grain boundary phase alloy separately. Direct crushing by hydrogen explosion method, saturated hydrogen absorption at room temperature, then dehydrogenation at 520°C for 8 hours to make hydrogen explosion powder, and finally make powders with average particle diameters of 4.5 μm and 3 μm respectively by jet mill under nitrogen protection;

[0046] 4) Evenly mix the reconstituted grain boundary pha...

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Abstract

The invention discloses a high-obdurability Nd-Fe-B sintered magnet reconstructed by the grain boundary phase and the preparation method thereof. The Nd-Fe-B sintered magnet comprises the component of NdeFe100-e-f-gBfMg, wherein, e is more than or equal to 6 and less than or equal to 24, f is more than or equal to 5.3 and less than or equal to 6.4, and g is more than or equal to 0.01 and less than or equal to 6, and M is one or more elements of Dy, Tb, Pr, Sm, Ce, Yb, Co, Ni, Mn, Nb, Ta, Zr, Si, Ti, Mo, Ag, Au, Mg, Cu, Al, Zn, Ga, Bi, Sn and In; the preparation method comprises the following steps: main phase alloy and grain boundary phase alloy are respectively prepared into powder, and then the powder is intensively mixed; the mixed powder is pressed into the molded blank in the magnetic field; and the sintered magnet is obtained in a high-vacuum sintering oven. Through the restruction of the grain boundary phase component, the solution grain boundary phase alloy with low smelting point and high strength ductility is achieved, the obdurability of the grain boundary phase is enhanced on the basis that the magnetic property is guaranteed, thereby the high ductility of the magnet is enhanced, and the process is simple, the cost is low, and the magnet is suitable for the mass production, thereby the double-alloy method combined with the grain boundary restruction can be used for preparing the Nd-Fe-B sintered magnet with high obdurability.

Description

technical field [0001] The invention relates to a high-strength and toughness sintered Nd-Fe-B magnet with restructured grain boundary phase and a preparation method thereof. Background technique [0002] Sintered NdFeB permanent magnet material belongs to the third generation rare earth permanent magnet material. Compared with other types of permanent magnet materials, it has outstanding advantages such as high magnetic performance and low price, which makes its development and application have achieved extraordinary development. At present, its comprehensive magnetic properties have reached a high level, and its application has involved various fields of the national economy, especially in computer, information, automobile, nuclear magnetic resonance imaging, CD, ROM, DVD and other industries. [0003] As a functional material, sintered NdFeB has been focused on how to improve its magnetic properties. After 24 years of development, breakthroughs have been made. The maximu...

Claims

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Application Information

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IPC IPC(8): H01F1/057C22C38/00C22C33/02
Inventor 严密周向志崔熙贵樊熊飞
Owner ZHEJIANG UNIV
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