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Method for preparing double-phase composite samarium cobalt-iron powder

A technology of iron powder and samarium cobalt, which is applied in the field of preparation of samarium cobalt-iron powder to achieve excellent performance, high saturation strength, and improved magnet performance

Active Publication Date: 2013-02-13
NINGBO INST OF MATERIALS TECH & ENG CHINESE ACADEMY OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Therefore, although the magnetic properties of the cobalt permanent magnet material are inferior to those of the third-generation rare earth permanent magnet material NdFeB, it cannot be replaced by NdFeB under high temperature and corrosive conditions.

Method used

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  • Method for preparing double-phase composite samarium cobalt-iron powder
  • Method for preparing double-phase composite samarium cobalt-iron powder

Examples

Experimental program
Comparison scheme
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Embodiment 1

[0042] In this embodiment, the preparation method of dual-phase composite samarium cobalt-iron powder comprises the following steps:

[0043] (1) Pretreatment of samarium cobalt powder:

[0044] The samarium cobalt powder is mechanically ground to a thickness of about 5 nanometers to 100 nanometers and a diameter of about 1 micron to 100 microns. The samarium cobalt powder is washed 5 to 10 times with an organic solvent, and dried in vacuum. Then the samarium cobalt powder is derusted and activated: add the samarium cobalt powder to dilute nitric acid with a concentration of 1% for 1 minute, then put the samarium cobalt powder into deionized water for 10 seconds, and then wash it with an organic solvent 10 times, and then vacuum-dried for later use.

[0045](2) Prepare 1-butyl-3-methylimidazolium chloroaluminate type ionic liquid in the glove box:

[0046] In the glove box, weigh 1-butyl-3-methyl imidazole chloride and anhydrous aluminum chloride according to the molar rati...

Embodiment 2

[0057] In this embodiment, the preparation method of dual-phase composite samarium cobalt-iron powder comprises the following steps:

[0058] (1) Pretreatment of samarium cobalt powder:

[0059] The samarium cobalt powder is mechanically ground to a thickness of about 5 nanometers to 100 nanometers and a diameter of about 1 micron to 100 microns. The samarium cobalt powder was washed 5 to 10 times with acetone, and dried in vacuum. Then the samarium cobalt powder is subjected to rust removal and activation treatment: the samarium cobalt powder is added to dilute nitric acid with a concentration of 1% for 1 minute, then the samarium cobalt powder is placed in deionized water for 10 seconds, and then cleaned with acetone for 10 seconds. times, and then vacuum-dried for later use.

[0060] (2) Preparation of 1-butyl-3-methylimidazolium tetrafluoroborate ionic liquid ferric chloride solution:

[0061] Add an appropriate amount of ferric chloride to 1-butyl-3-methylimidazolium t...

Embodiment 3

[0066] In this example, the preparation method of the two-phase composite samarium-cobalt-iron powder is basically the same as that in Example 1, except that the 1-butyl-3-methyl Adding methylbenzene with a volume ratio of 30% to the imidazolium chloroaluminate type ionic liquid, and then performing steps (3) and (4) to obtain a dual-phase composite samarium cobalt-iron powder product.

[0067] XPS detection of the dual-phase composite samarium-cobalt-iron powder prepared above shows that the powder contains iron element, which proves that a layer of iron is indeed deposited on the samarium-cobalt. The magnetic properties of the dual-phase composite samarium-cobalt-iron powder were tested, and it was found that compared with the pure samarium-cobalt powder, the coercive force was not much different, but the saturation magnetization was greatly improved.

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Abstract

The invention discloses a method for preparing double-phase composite samarium cobalt-iron powder. The method comprises the following steps of: adding an iron salt into ionic liquid serving as a solvent to prepare an iron salt solution of the ionic liquid, adding samarium cobalt powder, obtaining a layer of iron on the samarium cobalt surface through chemical replacement reaction, and thus obtaining the iron clad double-phase composite samarium cobalt powder. The samarium cobalt-iron composite powder is prepared into magnet workpieces by the processes of pressing molding, sintering and the like, the outer layer of the samarium cobalt grains of the sintered magnet structure is a pure iron soft magnetic phase, and the kernel of the grains is a samarium cobalt hard magnetic phase; the magnet performance is improved by exchange coupling effect; compared with the pure samarium cobalt powder, the composite samarium cobalt-iron powder has the advantages that: the coercive force is basically not changed, and the saturation magnetization intensity and the magnetic energy product are greatly improved; and the composite samarium cobalt-iron powder is a novel magnetic material with excellent performance.

Description

technical field [0001] The invention belongs to the technical field of magnetic materials, in particular to a preparation method of two-phase composite samarium cobalt-iron powder. Background technique [0002] Samarium cobalt material is a typical hard magnetic material, which belongs to the second generation of rare earth permanent magnet materials. It has high anisotropy and high coercive force, but its saturation magnetization is low. [0003] Compared with the first-generation permanent magnet materials, the cobalt-shirt permanent magnet materials have excellent permanent magnetic properties, such as large magnetic energy product and reliable coercive force. However, compared with the third-generation rare-earth permanent magnet materials, such as NdFeB and S-Co permanent magnet materials, the magnetic properties are lower. On the other hand, due to the high Curie temperature of the samarium cobalt permanent magnet material, it can work at a relatively high temperature...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B22F9/24B22F1/00
Inventor 宋振纶杜娟汪少杰刘晶晶
Owner NINGBO INST OF MATERIALS TECH & ENG CHINESE ACADEMY OF SCI