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A preparation method of light rare earth complex modified sintered samarium cobalt magnet

A technology of samarium-cobalt magnets and complexes, applied in the fields of magnetic objects, inductors/transformers/magnets, magnetic materials, etc., can solve the problems of restricting industrial development, reducing coercive force value, and limited improvement of magnetic properties, reaching Cellular organization, improved magnetic performance, and improved magnetic energy product

Active Publication Date: 2017-10-17
东阳富仕特磁业有限公司
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  • Abstract
  • Description
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  • Application Information

AI Technical Summary

Problems solved by technology

At present, the way to improve the magnetic properties of sintered samarium cobalt magnets is mainly achieved by improving the heat treatment process and increasing the Fe content, but the improvement of the magnetic properties is limited.
Horiuchi et al. prepared a 2:17 SmCo permanent magnet with a magnetic energy product of 35MGOe through the improvement of the heat treatment process, which is the largest magnetic energy product recorded so far. However, the alloy contains a large amount of scarce resource Sm and strategic reserve resource Co , which greatly limits its industrial development; the permanent magnet material research laboratory of the General Institute of Iron Research has developed a 2:17 SmCo permanent magnet with a maximum energy product of 10.52MGOe at a high temperature of 500°C by increasing the content of Fe in the alloy. , but this method reduces the coercivity value to a certain extent

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] 1) Smelting: Using samarium, cobalt, iron, copper, and zirconium with a purity greater than 99.94% as raw materials, under the protection of an inert gas, smelting to prepare an alloy composition of Sm: 18.5wt.%, Co: 62.6wt.%, Fe: 6.0 wt.%, Cu: 7.2wt.%, Zr: 5.7wt.% Sm-Co-Fe-Cu-Zr master alloy ingot;

[0018] 2) Powder making: crush the samarium-cobalt ingot into 160μm alloy coarse powder by jaw crusher and disc mill, and then crush the alloy coarse powder into 5μm samarium-cobalt alloy powder by jet milling method. While crushing, add the mixture of 2,5-di-tert-butylhydroquinone and tert-butylhydroxyanisole into the jet mill chamber by pouring, and the 2,5-di-tert-butylhydroquinone The weight ratio with tert-butyl hydroxyanisole is 1:0.2, and the blending amount of this mixture accounts for 0.1% of the total weight of samarium cobalt powder;

[0019] 3) Mixing material: the quaternary complex of lanthanide light rare earth (La, Pr) (NO 3 ) 2 (phen) 2 (CH 3 COCHCOCH...

Embodiment 2

[0029] 1) Smelting: Using samarium, cobalt, iron, copper, and zirconium with a purity greater than 99.94% as raw materials, under the protection of an inert gas, smelting to prepare an alloy composition of Sm: 21.0wt.%, Co: 60.1wt.%, Fe: 6.0 wt.%, Cu: 7.2wt.%, Zr: 5.7wt.% Sm-Co-Fe-Cu-Zr master alloy ingot;

[0030] 2) Powder making: crush the samarium-cobalt ingot into 180μm alloy coarse powder by jaw crusher and disc mill, and then crush the alloy coarse powder into 8μm samarium-cobalt alloy powder by jet mill While crushing, add the mixture of 2,5-di-tert-butylhydroquinone and isooctyl propionate into the jet mill chamber by pouring, 2,5-di-tert-butylhydroquinone The weight ratio with isooctyl propionate is 1:0.4, and the blending amount of this mixture accounts for 0.7% of the total weight of samarium cobalt powder;

[0031] 3) Mixing material: the non-methenyl light rare earth complex (Ce, Pm) (odpp) 3 (thf) 2 The mixed liquid with methyl acetate is added to the samariu...

Embodiment 3

[0041] 1) Smelting: Using samarium, cobalt, iron, copper, and zirconium with a purity greater than 99.94% as raw materials, under the protection of an inert gas, smelting to prepare an alloy composition of Sm: 23.5wt.%, Co: 57.6wt.%, Fe: 6.0 wt.%, Cu: 7.2wt.%, Zr: 5.7wt.% Sm-Co-Fe-Cu-Zr master alloy ingot;

[0042] 2) Powder making: crush the samarium-cobalt ingot into 200μm alloy coarse powder by jaw crusher and disc mill, and then crush the alloy coarse powder into 11μm samarium-cobalt alloy powder by jet mill While crushing, the mixture of 2,5-di-tert-butyl hydroquinone and pentaerythritol diphosphite is added to the jet mill chamber in a pouring manner, and 2,5-di-tert-butyl hydroquinone and The weight ratio of pentaerythritol diphosphite is 1:0.6, and the blending amount of this mixture accounts for 1.3% of the samarium cobalt powder gross weight;

[0043] 3) Mixing material: the lanthanide light rare earth quaternary complex (Nd,Eu)(NO 3 ) 2 (phen) 2 (CH 3 COCHCOCH ...

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Abstract

The invention discloses a preparation method of a light rare earth complex modified sintered samarium-cobalt magnet. The method includes the following steps of melting an Sm-Co-Fe-Cu-Zr master alloy cast ingot, smashing the cast ingot into powder through rough breaking and jet milling, injecting an antioxidant, adding mixed liquid of light rare earth complex and methyl acetate to a samarium-cobalt powder material, conducting high-energy ball-milling, crushing and even mixing, pressing the mixed material into a blank magnet according to magnetic alignment, putting the blank magnet into a vacuum sintering furnace to be subjected to sintering and solution treatment, then conducting ageing treatment, and conducting natural cooling to the room temperature to obtain the samarium-cobalt magnet. By adding light rare earth complex to the mixed material and combining the high-energy ball-milling technology, sintered light rare earth elements are mainly distributed on cell walls, cellular structures are greatly refined, and therefore the coercivity and magnetic energy product of the sintered samarium-cobalt magnet are improved. The method is simple in process, easy to operate and suitable for mass production.

Description

technical field [0001] The invention relates to a preparation method of a sintered samarium cobalt magnet, in particular to a preparation method of a light rare earth complex modified sintered samarium cobalt magnet, and belongs to the technical field of permanent magnet materials. Background technique [0002] With the rapid development of science and technology, there is an urgent need to develop new high-performance permanent magnet materials that can work at high temperatures in aviation, aerospace technology, microwave technology, precision instruments and devices. Although the coercivity of NdFeB permanent magnet materials at room temperature can meet the requirements, its Curie temperature is low and the temperature coefficient is too high, which is far from meeting the operating temperature requirements of spacecraft and some high-temperature torque motors; and SmCo permanent magnets The alloy not only has high coercive force, but also has the advantages of high Curi...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01F1/055H01F1/08H01F41/02B22F9/04B22F3/10
CPCB22F3/101B22F9/04B22F2009/043B22F2999/00H01F1/0555H01F41/0266B22F2201/20B22F2201/11
Inventor 泮敏翔张朋越葛洪良吴琼马正怀
Owner 东阳富仕特磁业有限公司
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