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High-abundance rare earth sintered permanent magnet and preparation method thereof

A permanent magnet, high-abundance technology, used in the manufacture of magnetic objects, permanent magnets, inductors/transformers/magnets, etc., can solve the problems of poor consistency of cooling links, uneven sintering temperature, affecting product quality, etc., to improve product performance. , avoid grain growth, improve the effect of consistency

Active Publication Date: 2021-09-24
宁波市易赞磁业有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The conventional method uses graphite boxes to be stacked, and there are situations such as uneven sintering temperature, poor consistency of cooling links, and poor cooling effect, which affect product quality.

Method used

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  • High-abundance rare earth sintered permanent magnet and preparation method thereof
  • High-abundance rare earth sintered permanent magnet and preparation method thereof
  • High-abundance rare earth sintered permanent magnet and preparation method thereof

Examples

Experimental program
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Effect test

no. 1 example

[0028] This embodiment provides a method for preparing a high-abundance rare earth permanent magnet, comprising the following steps:

[0029] 1. Obtain metal raw materials according to the ratio of 0.9-1.12% of boron-iron alloy, 64.38-70.1% of pure iron, 29-32.5% of rare earth elements, and 0-2% of trace elements; pretreatment removes oxidized impurities on the surface.

[0030] 2. Smelt and process the alloy obtained from the above pretreatment, put it into the melting furnace, evacuate to below 0.4Pa, preheat for 20-30min, and fill it with 2.7×10 4 Pa, followed by high-power smelting, the melting temperature is 1300-1380°C and the melting time is 25-35min.

[0031] 3. Pour the refined alloy solution into the mullite tundish, cool and cast through the circulating water-cooled barrel roll, and finally cool it in the water-cooled plate. When cooling, 0.03MPa argon gas is introduced to supplement the air for cooling; the surface speed of the copper roller is required to be cont...

Embodiment 2

[0043] This embodiment provides a high-abundance rare earth sintered permanent magnet, which includes the following elements in proportion by mass: 0.92% of boron-iron alloy, 66.58% of pure iron, 31.5% of rare earth elements, and 1% of trace elements.

[0044] Wherein, the rare earth elements include 75% praseodymium-neodymium alloy, 5% gadolinium-iron alloy and 20% high-abundance cerium according to the mass ratio. The trace elements are one or more of gallium, cobalt, aluminum, copper, zirconium, niobium and manganese.

[0045] Refer to Example 1 for the preparation process of the above-mentioned permanent magnet, and its sintering process parameters are set as follows.

[0046] Degassing and dehydrogenation: in a vacuum environment, control the temperature at 500°C and keep it warm for 2 hours;

[0047] Secondary degassing: control the temperature at 800°C and keep it warm for 4 hours;

[0048] High-temperature sintering: control the temperature at 900°C and keep it warm ...

Embodiment 3

[0051] This embodiment provides a high-abundance rare earth sintered permanent magnet, which includes the following elements in proportion by mass: 0.98% of boron-iron alloy, 66.02% of pure iron, 31.8% of rare earth elements, and 1.2% of trace elements.

[0052] Wherein, the rare earth elements include 50% praseodymium-neodymium alloy, 10% gadolinium-iron alloy and 40% high-abundance cerium according to the mass ratio. The trace elements are one or more of gallium, cobalt, aluminum, copper, zirconium, niobium and manganese.

[0053] Refer to Example 1 for the preparation process of the above-mentioned permanent magnet, and its sintering process parameters are set as follows.

[0054] Degassing and dehydrogenation: In a vacuum environment, control the temperature at 530°C and keep it warm for 1.5 hours;

[0055] Secondary degassing: control the temperature at 820°C and keep it warm for 3 hours;

[0056] High-temperature sintering: control the temperature at 950°C and keep it wa...

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Abstract

The invention provides a high-abundance rare earth sintered permanent magnet and a preparation method thereof. The permanent magnet comprises the following components in percentage by mass of 0.9 to 1.12 percent of ferroboron alloy, 64.38 to 70.1 percent of pure iron, 29 to 32.5 percent of rare earth element and 0 to 2 percent of trace element. The preparation process adopts a specific sintering process curve and is combined with a specific sintering frame, so that the temperature stability is improved, and the comprehensive performance of a product is improved.

Description

technical field [0001] The invention relates to the technical field of new materials, in particular to a high-abundance rare earth sintered permanent magnet and a preparation method thereof. Background technique [0002] Among the rare earth permanent magnet materials, NdFeB permanent magnet materials are most commonly used. Because of their advantages of high energy density and high magnetic energy product, instruments and meters may become thinner and smaller. [0003] In the process of permanent magnet sintering preparation, there are many formula processes for adding metal cerium to sintered NdFeB. The sintering process temperature is basically a high-temperature sintering process at 1000-1100 ° C, which is more suitable for the sintering temperature of NdFeB. For sintering containing cerium The performance of NdFeB magnets has a certain influence, especially when the replacement ratio of cerium content is high. In the original sintering process, no specific sintering t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01F7/02H01F1/053H01F41/02
CPCH01F7/02H01F1/053H01F41/02
Inventor 郑标兵杨平达王磊龙东瑞凌世健
Owner 宁波市易赞磁业有限公司
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