Mixed rare earth sintering permanent magnet and preparation method thereof

A technology of mixed rare earths and mixed rare earth alloys, which is applied in the manufacture of magnetic objects, permanent magnets, inductors/transformers/magnets, etc., can solve problems such as difficulties and adverse effects on magnetic properties, and achieve the effects of protecting the environment and saving costs

Active Publication Date: 2015-06-17
BEIJING ZHONG KE SAN HUAN HI TECH +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Chinese patent application 201310008783.3 presents a low-cost magnet prepared by using mixed rare earths and its preparation method, but La generates stable La in the magnet 2 Fe 14 The B main phase is a very difficult thing, and it needs a special heat treatment process to achieve it stably in batches in industrial production; when the sintering temperature of the mixed rare earth magnet is above 1100 ° C, α-Fe and La will be formed. 2 Fe 14 B phase, which has a significant adverse effect on magnetic properties; when the tempering temperature is above 900 ° C, La 2 Fe 14 Phase B will decompose into α-Fe and LaB phases, which also have a significant adverse effect on magnetic properties

Method used

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  • Mixed rare earth sintering permanent magnet and preparation method thereof
  • Mixed rare earth sintering permanent magnet and preparation method thereof
  • Mixed rare earth sintering permanent magnet and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] The mass fraction composition of alloy A is:

[0027] MM 32.6 Co 0.5 Cu 0.08 B 1.0 Fe More than MM is a typical mixed rare earth alloy of Baiyun Obo Mine in Baotou. Its composition is La27.1%, Ce51.5%, Pr5.2%, Nd16.2%, Sm less than 0.03%, and the rest are inevitable impurities.

[0028] The mass fraction composition of alloy B is:

[0029] (Pr, Nd) 28.8 Dy 1.8 Co 0.9 (Cu, Al, Nb) 0.5 B 1.0 Fe More than

[0030] The corresponding alloy flake A and alloy flake B are obtained by the quick-setting flake process, and their average thickness is 0.25mm. Then, the alloy flake A was kept at 800°C for 3 hours in a vacuum sintering furnace (vacuum degree 6.5 (Pr, Nd) 23.0 Dy 1.4 Co 0.7 B 1.0 (Cu, Al, Nb) 0.5 Fe More than . The sintered blank magnet is cut, ground to remove the oxide scale, and then the surface is cleaned with alkaline solution to obtain a base magnet of φ8mm×6.5mm, where the 6.5mm direction is the orientation direction.

[0031] Tb(NO 3 ) 3 And Tb-Fe-Al powder mixture,...

Embodiment 2

[0034] The composition of the used alloy A and alloy B and the preparation process of the fine powder are the same as in Example 1. The micropowders A and B were mixed at a ratio of 50:50 for 3 hours. The pressing and sintering process is also the same as in Example 1. The nominal composition of the obtained mixed rare earth permanent magnet sintered blank is MM 16.3 (Pr, Nd) 14.4 Dy 0.9 Co 0.5 B 1.0 (Cu, Al, Nb) 0.5 Fe More than . The sintered blank magnet is cut, ground to remove the oxide scale, and then the surface is cleaned with alkaline solution to obtain a base magnet of φ8mm×6.5mm, where the 6.5mm direction is the orientation direction.

[0035] The grain boundary diffusion method of the magnet and the subsequent tempering process are the same as in Example 1.

Embodiment 3

[0037] The composition of the used alloy A and alloy B and the preparation process of the fine powder are the same as in Example 1. The micropowders A and B were mixed at a ratio of 60:40 for 3 hours. The pressing and sintering process is also the same as in Example 1. The nominal composition of the obtained mixed rare earth permanent magnet sintered blank is MM 19.6 (Pr, Nd) 11.5 Dy 0.7 Co 0.4 B 1.0 (Cu, Al, Nb) 0.5 Fe More than . The sintered blank magnet is cut, ground to remove the oxide scale, and then the surface is cleaned with alkaline solution to obtain a base magnet of φ8mm×6.5mm, where the 6.5mm direction is the orientation direction.

[0038] The grain boundary diffusion method of the magnet and the subsequent tempering process are the same as in Example 1.

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Abstract

The present invention provides a mixed rare earth sintered permanent magnet and preparation method thereof. The preparation method of the mixed rare earth sintered permanent magnet prepares the sintered permanent magnet by more than two kinds of alloys. The preparation method of the mixed rare earth sintered permanent magnet of the present invention may produce a sintered magnet with a magnetic energy product such as 2-45 MGOe and optional performance by adjusting proportions of each alloy according to need. A stable main phase of R2Fe14B can be formed by multi-alloy process. Because the permanent magnet is prepared directly by the mixed rare earth, steps of extraction, separation and purification for preparing a single rare earth can be partly saved on one hand, the cost is greatly saved and the environment is protected; the comprehensive utilization of the rare earth resource can be maximized on the other hand.

Description

Technical field [0001] The invention relates to a mixed rare earth sintered permanent magnet and a preparation method thereof, in particular to a method for preparing a mixed rare earth sintered permanent magnet by adopting a multi-alloy process. Background technique [0002] In recent years, due to its excellent comprehensive magnetic properties, sintered NdFeB magnets are conducive to the realization of miniaturization, lightening and thinning of products such as motors, especially in terms of energy saving. Therefore, they have been widely used in various fields. Application, the demand for sintered NdFeB has also increased significantly. However, as the price of rare earths continues to rise, the price of neodymium iron boron magnets has also soared, which greatly limits the scope of application and further expansion of demand for sintered neodymium iron boron magnets. Therefore, there is an urgent need to find a new method to reduce the cost of sintered NdFeB magnets, reali...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01F1/053H01F7/02H01F41/02B22F9/04B22F3/16
CPCH01F1/0577
Inventor 胡伯平赵玉刚陈国安钮萼饶晓雷张瑾陈治安
Owner BEIJING ZHONG KE SAN HUAN HI TECH
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