Cerium-containing neodymium-iron-boron magnet and heat treatment processs and application thereof

A neodymium-iron-boron and heat treatment technology, which is applied in the manufacture of magnetic objects, magnetic materials, inductors/transformers/magnets, etc., can solve the problems of the comprehensive performance decline of cerium-containing neodymium-iron-boron magnets, so as to ensure the comprehensive magnetic performance of the magnets, reduce cost effect

Active Publication Date: 2018-12-21
SHANGHAI JIAO TONG UNIV +2
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] In view of the shortcomings of the prior art described above, the purpose of the present invention is to provide a cerium-containing NdFeB magnet and its heat treatment process and application, which are used to solve the problem of the decline in the comprehensive performance of the cerium-containing NdFeB magnet in the prior art

Method used

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  • Cerium-containing neodymium-iron-boron magnet and heat treatment processs and application thereof
  • Cerium-containing neodymium-iron-boron magnet and heat treatment processs and application thereof
  • Cerium-containing neodymium-iron-boron magnet and heat treatment processs and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0047] A low-cost NdFeB magnet with high cerium content, which is prepared by sintering process with components: praseodymium neodymium (Pr-Nd): 29kg, cerium (Ce): 3kg, niobium (Nb): 0.2kg , boron (B): 1kg, aluminum (Al): 0.8kg, copper (Cu): 0.12kg, cobalt (Co): 0.2kg, iron (Fe): 65.68kg.

[0048]In the vacuum sintering furnace, firstly, the sintered NdFeB magnet is subjected to the primary tempering process, the heating rate is first 8°C / min, the temperature is raised to 590°C, the heating rate is reduced to 2°C / min, and the temperature is raised to the first-stage tempering The temperature is 645°C, the temperature is kept for 3 hours, and the vacuum degree is 0.8 Pa. After the end, the vacuum degree is filled with nitrogen and air-cooled to room temperature. Then perform secondary tempering, the heating rate is first 8°C / min, the temperature is raised to 485°C, the heating rate is reduced to 2°C / min, the temperature is raised to the secondary tempering temperature of 535°C,...

Embodiment 2

[0054] A low-cost NdFeB magnet with high cerium content, which is prepared by sintering the following components: praseodymium neodymium (Pr-Nd): 22.2kg, cerium (Ce): 8kg, dysprosium (Dy): 1.2 kg, holmium (Ho): 0.4kg, gallium (Ga): 0.2kg, niobium (Nb): 0.2kg, boron (B): 1kg, aluminum (Al): 0.4kg, copper (Cu): 0.15kg, cobalt (Co): 0.2 kg, zirconium (Zr): 0.1 kg, iron (Fe): 65.95 kg.

[0055] In the vacuum sintering furnace, firstly, the sintered NdFeB magnet is subjected to the primary tempering process, the heating rate is first 8°C / min, the temperature is raised to 590°C, the heating rate is reduced to 2°C / min, and the temperature is raised to the first-stage tempering The temperature is 640°C, the temperature is kept for 3 hours, and the vacuum degree is 0.8 Pa. After the end, the vacuum degree is filled with nitrogen and air-cooled to room temperature. Then perform secondary tempering, the heating rate is first 8°C / min, the temperature is raised to 485°C, the heating rate ...

Embodiment 3

[0061] A low-cost NdFeB magnet with high cerium content, which is prepared by sintering process from the following components: praseodymium neodymium (Pr-Nd): 21kg, cerium (Ce): 11kg, niobium (Nb): 0.2kg , boron (B): 1kg, aluminum (Al): 0.8kg, copper (Cu): 0.12kg, cobalt (Co): 0.2kg, iron (Fe): 65.68kg.

[0062] In the vacuum sintering furnace, firstly, the sintered NdFeB magnet is subjected to the primary tempering process, the heating rate is first 8°C / min, the temperature is raised to 590°C, the heating rate is reduced to 2°C / min, and the temperature is raised to the first-stage tempering The temperature is 645°C, the temperature is kept for 3 hours, and the vacuum degree is 0.8 Pa. After the end, the vacuum degree is filled with nitrogen and air-cooled to room temperature. Then perform secondary tempering, the heating rate is first 8°C / min, the temperature is raised to 485°C, the heating rate is reduced to 2°C / min, the temperature is raised to the secondary tempering tempe...

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Abstract

The invention provides a cerium-containing neodymium-iron-boron magnet and a heat treatment processs and application thereof. The cerium-containing neodymium-iron-boron magnet comprises that followingcomponent in parts by weight: 20-32 parts by weight of praseodymium-neodymium alloy (Pr-Nd), 3-11 parts by weight of cerium (Ce), 40.65 to 76.06 parts by weight of iron (Fe), wherein the percentage content of heavy rare earth elements in the cerium-containing neodymium-iron-boron magnet is low than 3 percent, and the cerium-containing neodymium-iron-boron magnet does not contain low melting pointrare earth liquid phase alloy. The heat treatment process comprises a three-stage tempering treatment. The cerium-containing neodymium-iron-boron magnet can be used for preparing motors, the cerium-containing NdFeB magnet has excellent performance.

Description

technical field [0001] The invention relates to a cerium-containing neodymium-iron-boron magnet and its heat treatment process and application. Background technique [0002] Compared with ordinary magnets, NdFeB magnets have a very large magnetic energy product and coercive force, and are widely used in high-tech fields such as communications, medical treatment, and electronics. With the increasing market demand, the demand for NdFeB magnet raw materials has also increased sharply, so the price of praseodymium-Nd alloy is getting more and more expensive, which leads to the higher cost of sintered NdFeB. In order to reduce the cost of sintered NdFeB magnets, cerium with large reserves and low price is currently used to replace NdPr in sintered NdFeB magnets. However, the saturation magnetization and anisotropy field of the cerium-iron-boron phase are lower than those of the NdFeB phase. If a large amount of cerium is added to the NdFeB magnet, the comprehensive magnetic prop...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01F1/057H01F41/02C22C38/12C22C38/06C22C38/16C22C38/10C22C38/14
CPCC22C38/002C22C38/005C22C38/06C22C38/10C22C38/12C22C38/14C22C38/16H01F1/0577H01F41/0253
Inventor 刘梅张澜庭赵文强张孙云夏贤爽
Owner SHANGHAI JIAO TONG UNIV
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