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Sintered neodymium-iron-boron magnet and preparing method thereof

A technology of NdFeB magnets, which is applied in the direction of magnetic objects, inductors/transformers/magnet manufacturing, magnetic materials, etc., can solve the problems of reduced magnetic properties of sintered NdFeB magnets, save preparation costs, solve stacking problems, reduce The effect of performance reduction

Inactive Publication Date: 2015-12-30
ZHEJIANG DONGYANG DMEGC RARE EARTH MAGNET CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the addition of Ce element will lead to a sharp decrease in the magnetic properties of sintered NdFeB magnets

Method used

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  • Sintered neodymium-iron-boron magnet and preparing method thereof
  • Sintered neodymium-iron-boron magnet and preparing method thereof

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Experimental program
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Effect test

Embodiment 1

[0023] Supplementary phase CeH y It is directly obtained by crushing pure cerium metal with hydrogen absorption and jet milling, and the average particle size of the powder is 1.5 μm. 1wt% CeH y Incorporation (Ce 0.2 Nd 0.8 ) 31 Fe 67.7 al 0.1 Cu 0.1 Zr 0.1 B Jet mill powder, mixed evenly, oriented in a magnetic field to form a rough magnet, put it into a vacuum sintering furnace for sintering at 1020°C, 880°C + 500°C two-stage tempering treatment; and sintering at 1020°C, 880°C ℃+500℃+350℃ three-stage tempering treatment to prepare sintered NdFeB magnets, the magnetic properties are shown in Table 1.

Embodiment 2

[0025] Auxiliary phase PrNdH y It is directly obtained by hydrogen absorption crushing of praseodymium and neodymium metal, and jet milling powder, with an average particle size of 1.5 μm. 2wt% PrNdH y Incorporation (Ce 0.2 Nd 0.8 ) 31 Fe 67.7 al 0.1 Cu 0.1 Zr 0.1 B Jet mill powder, mixed evenly, oriented in a magnetic field to form a rough magnet, placed in a vacuum sintering furnace for sintering at 1010°C, 860°C+490°C two-stage tempering treatment; and sintering at 1010°C, 860°C ℃+490℃+320℃ three-stage tempering treatment to prepare sintered NdFeB magnets, the magnetic properties are shown in Table 1.

Embodiment 3

[0027] Supplementary phase CeH y It is directly obtained by crushing pure cerium metal with hydrogen absorption and jet milling, and the average particle size of the powder is 1.5 μm. 3wt% CeH y Incorporation (Ce 0.2 Nd 0.8 ) 31 Fe 67.7 al 0.1 Cu 0.1 Zr 0.1 B Jet mill powder, mixed evenly, oriented in a magnetic field to form a rough magnet, put it into a vacuum sintering furnace for sintering at 980°C, 850°C + 480°C two-stage tempering treatment; and sintering at 1050°C, 850°C ℃+480℃+280℃ three-stage tempering treatment to prepare sintered NdFeB magnets, the magnetic properties are shown in Table 1.

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Abstract

The invention discloses a sintered neodymium-iron-boron magnet and a preparing method thereof. The sintered neodymium-iron-boron magnet is prepared in the mode that Ce-enrichment main-phase alloy powder and low-melting-point TeHy auxiliary-phase powder are evenly mixed, sintered and subjected to three-section tempering. The mass-percent chemical formula of the Ce-enrichment main-phase alloy powder is (CexRe1-x)aFe100-a-b-cTMbBc. Re is one or more kinds of Pr and Nd, TM is one or more kinds of Co, Al, Cu, Ga, Nb and Zr, x ranges from 0.2 to 0.5, a ranges from 30 to 32.5, b ranges from 0.3 to 2.5, c ranges from 0.9 to 1.2, and Te is one or more kinds of La, Ce, Pr and Nd. The sintered neodymium-iron-boron magnet and the preparing method have the advantages that the performance reducing range caused by adding Ce is reduced, the utility ratio of Ce resources is increased, the preparing cost of sintered neodymium iron boron is saved, the Ce stacking problem is solved, the healthy-stable development of the rare earth industry is promoted, and important actual significance is achieved.

Description

technical field [0001] The invention relates to the related technical field of rare earth permanent magnet materials, in particular to a sintered NdFeB magnet and a preparation method thereof. Background technique [0002] NdFeB permanent magnet materials are widely used in the fields of computers, wind power generation, aerospace and equipment automation because of their excellent magnetic properties. In the preparation process of sintered NdFeB magnets, elements such as Pr, Nd, Dy and Tb need to be used in large quantities. In 2011, the drastic fluctuation of global rare earth price aroused widespread concern in the scientific and industrial circles at home and abroad. Seeking the replacement of key rare earth elements and the balanced utilization of rare earth resources has become a hot topic in current research. The most abundant element in ore resources is lanthanum and cerium, and the high-abundance Ce element has attracted the general interest of scientific research...

Claims

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Application Information

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IPC IPC(8): H01F1/057H01F1/08H01F41/02B22F3/10
Inventor 章晓峰郝忠彬洪群峰李润锋
Owner ZHEJIANG DONGYANG DMEGC RARE EARTH MAGNET CO LTD
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