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A kind of preparation method of samarium cobalt and iron cobalt composite magnet

A technology of composite magnets and iron-cobalt alloys, which is applied in the direction of magnetic objects, inductors/transformers/magnets, magnetic materials, etc., can solve problems such as difficulty in sufficient coupling, poor coupling between soft magnetic phase and hard magnetic phase, and achieve improved correction. Stubbornness, the effect of suppressing abnormal growth

Active Publication Date: 2015-07-29
PEKING UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Another difficulty often encountered in the preparation of nanocomposite magnets is the poor coupling of soft and hard magnetic phases
If the hard magnetic phase and the soft magnetic phase are prepared separately and then mixed together, it is usually difficult to fully couple the two

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] Prepare samarium cobalt and iron cobalt composite magnets according to the following steps:

[0020] (1) Electric arc furnace melting Sm 0.7 Cu 0.3 Alloy, throw it at 30m / s to form a thin strip, and then ball mill it into a powder with an average particle size of 10 microns;

[0021] (2) Electric arc furnace smelting Fe 0.7 co 0.3 alloy, place it in 10 -3 Annealing treatment at 1000°C for 30 hours under Pa vacuum, then ball milling and crushing into powder with an average particle size of 10 microns;

[0022] (3) will Sm 0.7 Cu 0.3 Powder and Fe 0.7 co 0.3 powder mix, where Sm 0.7 Cu 0.3 The mass fraction is 30%;

[0023] (4) Mix the powder at 10 -3 Annealing at 650° C. for 1 hour under Pa vacuum to obtain a nanocomposite magnet.

[0024] The room temperature magnetic properties of the prepared samples were measured by VSM, and the results are as follows:

[0025] Mr=0.72T, Hc=4000Oe, BHm=4MGOe.

Embodiment 2

[0027] Prepare samarium cobalt and iron cobalt composite magnets according to the following steps:

[0028] (1) Electric arc furnace melting Sm 0.71 Cu 0.29 Alloy, its 40m / s strip is thrown into a thin strip, and then the ball mill is crushed into a powder with an average particle size of 8 microns;

[0029] (2) Electric arc furnace smelting Fe 0.65 co 0.35 alloy, place it in 10 -3 Annealing treatment at 1050°C for 20 hours under Pa vacuum, then ball milling and crushing into powder with an average particle size of 8 microns;

[0030] (3) will Sm 0.71 Cu 0.29 Powder and Fe 0.65 co 0.35 powder mix, where Sm 0.71 Cu 0.29 The mass fraction is 20%;

[0031] (4) Mix the powder at 10 -3 Annealing at 680° C. for 2 hours under Pa vacuum to obtain a nanocomposite magnet.

[0032] The room temperature magnetic properties of the prepared samples were measured by VSM, and the results are as follows:

[0033] Mr=0.8T, Hc=3500Oe, BHm=3.8MGOe.

Embodiment 3

[0035] Prepare samarium cobalt and iron cobalt composite magnets according to the following steps:

[0036] (1) Electric arc furnace melting Sm 0.73 Cu 0.27 Alloy, its 20m / s strip is thrown into a thin strip, and then the ball mill is crushed into a powder with an average particle size of 15 microns;

[0037] (2) Electric arc furnace smelting Fe 0.72 co 0.28 alloy, place it in 10 -4 Annealing treatment at 1100°C for 15 hours under Pa vacuum, then ball milling and crushing into powder with an average particle size of 15 microns;

[0038] (3) will Sm 0.73 Cu 0.27 Powder and Fe 0.72 co 0.28 powder mix, where Sm 0.73 Cu 0.27 The mass fraction is 40%;

[0039] (4) Mix the powder at 10 -3 Annealing at 700° C. for 1 hour under Pa vacuum to obtain a nanocomposite magnet.

[0040] The room temperature magnetic properties of the prepared samples were measured by VSM, and the results are as follows:

[0041] Mr=0.65T, Hc=5300Oe, BHm=4.5MGOe.

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Abstract

The invention discloses a method for preparing a samarium cobalt and iron cobalt composite magnet. The method comprises the following steps of smelting samarium-copper alloy, forming thin strips through throwing, and crushing the strips into powder; smelting iron-cobalt alloy, carrying out annealing treatment, and then, crushing the iron-cobalt alloy into powder; and mixing samarium-copper powder and iron-cobalt powder, annealing the powder in vacuum, thereby obtaining a nanocomposite magnet. According to the method, the samarium-copper powder and the iron-cobalt powder are annealed together, and the samarium-copper powder is diffused to the surface layer of the iron-cobalt powder so as to form a Sm-Co-Cu hard magnetic shell layer; and particularly, samarium-copper eutectic alloy has a lower melting point and can be melted and diffused at a lower annealing temperature, so that the abnormal growth of crystal grains of the nanocomposite magnet at high temperature is inhibited. According to the nanocomposite magnet prepared by the method, no obvious boundary exists between a soft magnetic phase and a hard magnetic phase, anisotropic fields are in continuous transition, a non-magnetic samarium-copper phase is coated on the external surface of Sm-Co-Cu so as to play a magnetic insulation role, and therefore, the coercivity of the composite magnet is further improved.

Description

technical field [0001] The invention relates to the field of rare earth permanent magnets, in particular to a method for preparing a samarium-cobalt and iron-cobalt composite magnet by diffusion of a samarium-copper alloy and the prepared permanent magnet material. Background technique [0002] Permanent magnet materials are an important material basis for science and technology and production and life. Important parameters to measure permanent magnet materials include saturation magnetization, coercive force and Curie temperature. Decades of research have shown that it is difficult to find a material that combines high saturation magnetization, high coercivity and high Curie temperature. For example, samarium cobalt series (including 1:5 type, 1:7 type and 2:17 type) permanent magnet materials have high Curie temperature and high anisotropy field, which can provide high coercivity in high temperature applications force. However, the saturation magnetization of samarium c...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01F41/02H01F1/047B22F9/04B22F1/02
Inventor 杨金波韩景智林忠夏元华刘顺荃杨应昌
Owner PEKING UNIV
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