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Preparation method of high-coercivity sintered neodymium-iron-boron magnet

A high coercive force, neodymium iron boron technology, applied in the direction of magnetic objects, inductance/transformer/magnet manufacturing, magnetic materials, etc., can solve the problem that the coercive force is not high enough to improve the coercive force and coercive force high effect

Active Publication Date: 2020-11-10
YANTAI DONGXING MAGNETIC MATERIALS INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The purpose of the present invention is to solve the shortcomings of the traditional magnetic powder surface diffusion method, the coercive force increase range is not high, and provide a high coercive force sintered NdFeB magnet preparation method

Method used

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  • Preparation method of high-coercivity sintered neodymium-iron-boron magnet

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] In this embodiment, NdFeB alloy powder with an average particle size of 2 μm is used, and the aforementioned NdFeB alloy powder is divided into three parts A, B and C.

[0024] A powder does not do any treatment.

[0025] Use magnetron sputtering equipment to coat B powder with Tb film layer and Pr film layer successively, and form a Tbx+Prz mixed film layer on its surface, that is, do not process B powder to form M metal layer, wherein the average thickness of the Tb film layer is x is 1nm, and the thickness z of the Pr film is controlled at 10nm.

[0026] Using magnetron sputtering equipment, C powder is coated with Tb film layer, W film layer and Pr film layer successively, forming a Tbx+Wy+Prz mixed film layer on the surface, wherein the average thickness of the Tb film layer is 1nm, and the W film layer The average thickness y of the Pr film is 1nm, and the thickness of the Pr film is controlled at 10nm.

[0027] Three kinds of neodymium-iron-boron alloy powders ...

Embodiment 2

[0034] In this embodiment, NdFeB alloy powder with an average particle size of 3 μm is used, and the aforementioned NdFeB alloy powder is divided into three parts A, B and C.

[0035] A powder does not do any treatment.

[0036] Use magnetron sputtering equipment to coat Dy film layer and PrNd film layer successively on B powder, and form Dyx+(PrNd)z mixed film layer on its surface, wherein the average thickness x of Dy film layer is 5nm, and the thickness z of PrNd film layer is controlled at 15nm .

[0037]Use magnetron sputtering equipment to successively coat Dy film layer, Mo film layer and PrNd film layer on C powder, form Dyx+Moy+(PrNd)z mixed film layer on its surface, wherein the average thickness of Dy film layer is x is 5nm, Mo The average thickness y of the film layer is 10nm, and the thickness of the PrNd film layer is controlled at 15nm.

[0038] The processed NdFeB alloy powders A, B, and C are respectively oriented and formed in a magnetic field of 1.8T, and ...

Embodiment 3

[0045] In this embodiment, NdFeB alloy powder with an average particle size of 4.1 μm is used, and the aforementioned NdFeB alloy powder is divided into three parts A, B and C.

[0046] A powder does not do any treatment.

[0047] Use magnetron sputtering equipment to coat Dy film and Nd film layer successively on the B powder, and form a Dyx+Ndz mixed film layer on its surface, wherein the average thickness x of the Dy film layer is 10nm, and the thickness z of the Nd film layer is controlled at 20nm.

[0048] Using magnetron sputtering equipment, C powder is coated with Dy film layer, Mo film layer and Nd film layer successively, and a Dyx+Moy+Ndz mixed film layer is formed on the surface, wherein the average thickness of the Dy film layer is 10nm, and the Mo film layer The average thickness y of the film is 5nm, and the thickness of the Nd film is controlled at 20nm.

[0049] The three kinds of neodymium-iron-boron alloy powders A, B, and C after treatment were respectivel...

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Abstract

The invention discloses a preparation method of a high-coercivity sintered neodymium-iron-boron magnet, and the method comprises the following steps: before oriented profiling, sequentially depositingan R metal layer, an M metal layer and an H-L or H-H metal layer on neodymium-iron-boron powder by adopting a vapor deposition method to form an Rx + My + (H-L) z / (H-H) z mixed metal film layer, wherein R is at least one of Tb / Dy, M is at least one of W / Mo / Zr / Nb, H is at least one of Pr / Nd / La / Ce, and L is one of Cu / Al / Ga; and performing vacuum sintering aging treatment after oriented compressionto finally obtain the high-coercivity sintered neodymium-iron-boron magnet. By means of the isolation effect of the high-temperature-resistant M metal film layer in the sintering aging process, on theone hand, diffusion of R metal is promoted, the grain edge of the neodymium-iron-boron magnet is hardened, on the other hand, HH / HL metal is distributed around grains in a uniform thin-layer latticedmode through liquid diffusion, good isolation of main-phase grains is achieved, and the demagnetization coupling effect is enhanced; therefore, the coercive force of the sintered neodymium-iron-boronmagnet is greatly improved.

Description

technical field [0001] The invention relates to the technical field of rare earth material preparation, in particular to a preparation method of a high coercive force sintered NdFeB magnet. Background technique [0002] NdFeB permanent magnet materials are the most concerned rare earth application industry in my country's rare earth industry. With the development of science and technology and technological progress, the demand for high-performance NdFeB permanent magnet materials is becoming more and more extensive. The coercive force of sintered NdFeB is a very important magnetic parameter and a sensitive parameter of the structure, which is mainly affected by the HA of the main phase grains of the magnet and the grain boundaries between the main phase grains. The main phase grains The larger the HA of the magnet, the greater the final coercive force of the magnet, the wider and more continuous the grain boundary between the main phase grains, and the higher the coercive fo...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01F41/02H01F1/057
CPCH01F41/0293H01F41/0266H01F41/0253H01F1/0572H01F1/0577B22F1/05B22F1/17B22F2301/355B22F2304/10
Inventor 杨昆昆彭众杰丁开鸿
Owner YANTAI DONGXING MAGNETIC MATERIALS INC
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