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Sintered neodymium-iron-boron magnet and preparation method thereof

A technology of NdFeB and magnets, which is applied in the direction of magnetic objects, inductors/transformers/magnets, magnetic materials, etc. It can solve the problems of magnet microstructure deterioration, magnet squareness decrease, sintered NdFeB magnet coercive force decrease, etc. , to achieve the effect of promoting healthy and stable development, reducing energy consumption, and solving accumulation problems

Active Publication Date: 2016-06-22
ZHEJIANG DONGYANG DMEGC RARE EARTH MAGNET CO LTD
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  • Abstract
  • Description
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Problems solved by technology

[0004] However, the addition of a large amount of cheap and low-cost cerium (Ce) elements will lead to a sharp drop in the coercive force of the sintered NdFeB magnet; at the same time, the deterioration of the magnet microstructure caused by the addition of Ce will also cause a decrease in the squareness of the magnet.

Method used

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

Examples

Experimental program
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Effect test

Embodiment 1

[0024] The composition ratio of the main phase alloy is (Ce 0.5 Nd 0.2 Ho 0.3 ) 31 Fe bal Al 0.1 Cu 0.1 Zr 0.1 B is prepared by the process of quick setting, hydrogen breaking and jet milling, and the average powder particle size is 3.5μm. The Nd-Cu auxiliary phase powder is prepared by smelting ingots, hydrogen breaking, and high-energy ball milling, and the average powder particle size is 1.5 μm. Incorporate 1 wt% Nd-Cu auxiliary phase powder into (Ce 0.5 Nd 0.2 Ho 0.3 ) 31 Fe bal 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 1000°C and 900°C+400°C two-stage tempering treatment, 1000°C sintering and 400°C one-stage Sintered NdFeB magnets were prepared by tempering treatment. The magnetic properties are shown in Table 1.

Embodiment 2

[0026] The composition ratio of the main phase alloy is (Ce 0.5 Nd 0.2 Ho 0.3 ) 31 Fe bal Al 0.1 Cu 0.1 Zr 0.1 B is prepared by the process of quick setting, hydrogen breaking and jet milling, and the average powder particle size is 3.5μm. The Nd-Cu auxiliary phase powder is prepared by smelting ingots, hydrogen breaking, and high-energy ball milling, and the average powder particle size is 1.5 μm. Incorporate 2wt% Nd-Cu auxiliary phase powder into (Ce 0.5 Nd 0.2 Ho 0.3 ) 31 Fe bal 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 990°C and 900°C + 380°C two-stage tempering treatment and 990°C sintering and 380°C one-stage Sintered NdFeB magnets were prepared by tempering treatment. The magnetic properties are shown in Table 1.

Embodiment 3

[0028] The composition ratio of the main phase alloy is (Ce 0.5 Nd 0.2 Ho 0.3 ) 31 Fe bal Al 0.1 Cu 0.1 Zr 0.1 B is prepared by the process of quick setting, hydrogen breaking and jet milling, and the average powder particle size is 3.5μm. The Nd-Cu auxiliary phase powder is prepared by smelting ingots, hydrogen breaking, and high-energy ball milling, and the average powder particle size is 1.5 μm. Incorporate 3wt% Nd-Cu auxiliary phase powder into (Ce 0.5 Nd 0.2 Ho 0.3 ) 31 Fe bal 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 950°C and 900°C + 360°C two-stage tempering treatment and 950°C sintering and 360°C one-stage Sintered NdFeB magnets were prepared by tempering treatment. The magnetic properties are shown in Table 1.

[0029] Table 1. Comparison of magnetic properties

[0030]

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Abstract

The invention discloses a sintered neodymium-iron-boron magnet and a preparation method thereof. The sintered neodymium-iron-boron magnet is prepared by mixing high-Ce main phase alloy powder and low-melting-point Nd-Cu auxiliary phase powder evenly. The method comprises the steps as follows: the high-Ce main phase alloy powder is prepared by quick coagulating, hydrogen breaking and airflow milling processes; the low-melting-point Nd-Cu auxiliary phase powder is prepared by smelting and ingoting, hydrogen breaking and high-energy ball milling; and the high-Ce main phase alloy powder and the low-melting-point Nd-Cu auxiliary phase powder are mixed evenly at the ratio, and are sintered at a low temperature in a magnetic field after being mixed evenly; and a sintered sample is subjected to low-temperature tempering treatment to prepare the sintered neodymium-iron-boron magnet. The sintered neodymium-iron-boron magnet has the beneficial effects that the heavy addition practicability of a Ce element is achieved; after the Ce element is greatly added, the low-cost and high-Ce content sintered neodymium-iron-boron magnet is prepared; the problem of accumulation of the Ce element is solved; the energy consumption in magnet preparation is also reduced; and the sintered neodymium-iron-boron magnet has important practical significance for promotion of healthy and stable development of the rare-earth industry.

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. A large amount of rare earth elements such as Pr, Nd, Dy and Tb are used in the preparation process of sintered NdFeB. Lanthanum cerium, the most abundant element in ore resources, has not been fully utilized, mainly because the substitution of cerium will lead to a significant decrease in the magnetic properties of sintered NdFeB magnets. [0003] Theoretical studies show that Ce 2 Fe 14 B has certain intrinsic magnetic properties, although its saturation magnetization and anisotropy field are much lower than those of Nd 2 Fe 14 B, but some low-end sintered NdFeB magnets...

Claims

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Application Information

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IPC IPC(8): H01F1/057H01F41/02
CPCH01F1/0577H01F41/0293
Inventor 章晓峰郝忠彬洪群峰
Owner ZHEJIANG DONGYANG DMEGC RARE EARTH MAGNET CO LTD
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