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Method for preparing high-magnetic energy product samarium-cobalt-based permanent magnet by modifying hydrogenated samarium nano powder

A technology of high energy product and nanopowder, which is applied in the direction of magnetic objects, magnetic materials, inductors/transformers/magnets, etc., can solve the problems of magnet remanence and energy product improvement space, magnet coercive force decrease, etc., to achieve Wider use range, improved remanence, wide range of application effects

Inactive Publication Date: 2013-08-07
BEIJING UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] A common method to increase the remanence and coercive force of SmCoFeCuZr alloy is to increase the content of Fe and Co in the alloy, but this method will cause a significant decrease in the coercive force of the magnet at the same time
Moreover, after long-term research, there is not much room for improving the remanence and energy product of magnets by using this method.

Method used

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  • Method for preparing high-magnetic energy product samarium-cobalt-based permanent magnet by modifying hydrogenated samarium nano powder

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Experimental program
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Effect test

Embodiment 1

[0018] SmCoCuFeZr alloy ingots were prepared by intermediate frequency induction melting technology, and the composition was Sm: 25.4wt.%; Co: 58.0wt.%; Fe: 5.5wt.%; Cu: 7.8wt%; Zr: 3.3wt.%, and then Crushed into a powder with an average particle size of 3 microns. Afterwards, samarium hydride nanopowder accounting for 1% by weight of the SmCoCuFeZr micron powder and having an average particle size of 20 nanometers was doped into the above-mentioned initial powder, and the two were evenly mixed. The mixed powder was compacted in a magnetic field of 2T, and then subjected to isostatic pressing at a pressure of 200 MPa to obtain a green compact. Put the compact into a vacuum sintering furnace, pre-sinter the sample at 1190°C for 30 minutes in vacuum, then sinter at 1220°C under argon protection for 90 minutes, then undergo solution treatment at 1180°C for 210 minutes, and then air cool to room temperature; Carry out solution aging treatment, first keep warm at 840°C for 12h, th...

Embodiment 2

[0020] SmCoCuFeZr alloy ingots were prepared by intermediate frequency induction melting technology, and the composition was Sm: 26.4wt.%; Co: 57.0wt.%; Fe: 5.5wt.%; Cu: 7.8wt%; Zr: 3.3wt.%, and then Crushed into a powder with an average particle size of 4 microns. Afterwards, samarium hydride nanopowder accounting for 2% by weight of the SmCoCuFeZr micron powder and having an average particle size of 50 nanometers was doped into the above-mentioned initial powder, and the two were mixed evenly. The mixed powder was compacted in a magnetic field of 2T, and then subjected to isostatic pressing at a pressure of 200 MPa to obtain a green compact. Then put the compact into a vacuum sintering furnace, pre-sinter the sample in vacuum at 1190°C for 30 minutes, then sinter at 1225°C under argon protection for 90 minutes, then undergo solution treatment at 1185°C for 210 minutes, and then air cool to room temperature; Afterwards, solid solution aging treatment is carried out, first at...

Embodiment 3

[0022] SmCoCuFeZr alloy ingots were prepared by medium frequency induction melting technology, and the composition was Sm: 26.0wt.%; Co: 57.4wt.%; Fe: 5.5wt.%; Cu: 7.8wt%; Zr: 3.3wt.%, and then Crushed into a powder with an average particle size of 5 microns. Afterwards, 3% by weight of the SmCoCuFeZr micron powder is doped with samarium hydride nanopowder with an average particle size of 100 nanometers into the above initial powder, and the two are mixed evenly. The mixed powder was compacted in a magnetic field of 2T, and then subjected to isostatic pressing at a pressure of 200 MPa to obtain a green compact. Then put the compact into a vacuum sintering furnace, pre-sinter the sample in vacuum at 1190°C for 30 minutes, then sinter at 1230°C under argon protection for 90 minutes, and then undergo solution treatment at 1190°C for 210 minutes, and then air-cool to room temperature; Afterwards, solid solution aging treatment is carried out, first at 840°C for 12h, then cooled t...

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Abstract

Method for fabricating samarium-cobalt based magnet with high magnetic energy product by modification of samaric hydride nanometer powder, relating to permanent magnetic material technical field. SmCoCuFeZr alloy micrometer particles with 25.4-26.4 wt.% of Sm, 57.0-58.0 wt.% of Co, 5.5 wt.% of Fe, 7.8 wt.% of Cu, 3.3 wt.% of Zr are fabricated. The samarium-cobalt micrometer particles are uniformly mixed with 1-3 % of samaric hydride nanometer powder, and are compress-molded under a magnetic field of 2T. And then a pressed compact is press formed. The pressed compact is placed in a vacuum sintering furnace for sintering, and is subjected to solution treatment, and is wind cooled to room temperature. After solution and aging treatment, it can be naturally cooled to room temperature. The SmCoFeCuZr alloy fabricated by the method has higher remanence and high magnetic energy product, and has wider application range.

Description

technical field [0001] The invention relates to a preparation method of a samarium-cobalt-based permanent magnet, in particular to a method for preparing a high-energy-product samarium-cobalt-based permanent magnet by modifying samarium hydride nanopowder, and belongs to the technical field of permanent magnet materials. Background technique [0002] Samarium-cobalt-based permanent magnet materials not only have excellent permanent magnet properties, but also have good temperature stability, so they are widely used in room temperature and high temperature environments that require high magnetic properties. Especially in this year, with the rapid development of civil and military high-tech industries such as electric vehicles, aerospace, and nuclear energy industries, the demand for samarium-cobalt-based permanent magnet materials has been rapidly developed. [0003] At present, the mainstream product of samarium-cobalt-based permanent magnet material is 2:17 type SmCoFeCuZr ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01F41/02H01F1/047B22D27/00B22F3/16
CPCH01F1/0557B22F3/02C22C19/07H01F41/02B22F3/24C22C1/045B22F3/16B22F3/1007
Inventor 岳明张东涛黄俊刘卫强张久兴
Owner BEIJING UNIV OF TECH
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