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Method for preparing high-coercivity SmCoFeCuZr (samarium-cobalt-ferrum-copper-zirconium) high-temperature permanent magnet by doping nano-Cu powder

A high-coercivity, nano-technology, applied in the direction of magnetic objects, magnetic materials, inductors/transformers/magnets, etc., can solve the problems of reducing saturation magnetization, increasing coercive force, and reducing the maximum magnetic energy product of materials, etc.

Inactive Publication Date: 2012-07-11
BEIJING UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

To meet this requirement, one is to improve the high temperature stability of the material by adding some heavy rare earth metal elements (such as Ho, Er, Dy, Gd, etc.) for temperature compensation, but the addition of these alloy elements makes the saturation magnetization of the material Reduced, thereby reducing the maximum energy product of the material, and the cost is also increased; the second is to adjust the composition and process, greatly increase the coercive force, so as to ensure sufficient coercive force at high temperature

Method used

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  • Method for preparing high-coercivity SmCoFeCuZr (samarium-cobalt-ferrum-copper-zirconium) high-temperature permanent magnet by doping nano-Cu powder
  • Method for preparing high-coercivity SmCoFeCuZr (samarium-cobalt-ferrum-copper-zirconium) high-temperature permanent magnet by doping nano-Cu powder
  • Method for preparing high-coercivity SmCoFeCuZr (samarium-cobalt-ferrum-copper-zirconium) high-temperature permanent magnet by doping nano-Cu powder

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] The weight ratio of 0.25wt.% nanometer Cu powder (average particle size is 20 nanometers) and SmCoFeCuZr powder A are uniformly mixed, and sintered after orientation molding in a 2T magnetic field.

[0020] Sintering process: pre-fired in vacuum at 1180°C for 0.5 hours, then sintered at 1220°C under argon protection for 1.5 hours, then solid solution treated at 1180°C for 3.5 hours, and then air-cooled to room temperature before being released from the furnace.

[0021] Aging heat treatment process: heat preservation at 840°C for 10 hours, then cool to 400°C at a cooling rate of 0.4°C / min, keep heat for 10 hours, and then cool naturally to room temperature. The magnetic properties of the obtained magnets are shown in Table 1.

[0022] Magnetic properties of SmCoFeCuZr sintered magnets doped with 0.25wt.% nano Cu powder in the composition of Table 1A

[0023]

Embodiment 2

[0025] Mix 0.5wt.% nanometer Cu powder (average particle size is 50 nanometers) with SmCoFeCuZr powder A, sinter after magnetic field orientation molding.

[0026] Sintering process: Pre-fired in vacuum at 1180°C for 0.5 hours, then sintered at 1230°C under argon protection for 1.5 hours, then solid solution treated at 1185°C for 3.5 hours, and then air-cooled to room temperature before being released from the furnace.

[0027] Aging heat treatment process: heat preservation at 840°C for 12 hours, then cool to 420°C at a cooling rate of 0.5°C / min, keep heat for 10 hours, and then cool naturally to room temperature. The magnetic properties of the obtained magnets are shown in Table 2.

[0028] Magnetic properties of SmCoFeCuZr sintered magnets doped with 0.5wt.% nanometer Cu powder in the composition of Table 2A

[0029]

Embodiment 3

[0031] Mix 0.75wt.% nanometer Cu powder (average particle size is 100 nanometers) with SmCoFeCuZr powder A, sinter after magnetic field orientation molding.

[0032] Sintering process: Pre-fired in vacuum at 1190°C for 0.5 hours, then sintered at 1230°C under argon protection for 1.5 hours, then solid solution treated at 1180°C for 3.5 hours, and then air-cooled to room temperature before being released from the furnace.

[0033] Aging heat treatment process: heat preservation at 840°C for 10 hours, then cool to 420°C at a cooling rate of 0.6°C / min, keep heat for 10 hours, and then cool naturally to room temperature. The magnetic properties of the obtained magnets are shown in Table 3.

[0034] Magnetic properties of SmCoFeCuZr sintered magnets doped with 0.75wt.% nano Cu powder in the composition of Table 3A

[0035]

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Abstract

The invention relates to a method for preparing a high-coercivity SmCoFeCuZr (samarium-cobalt-ferrum-copper-zirconium) high-temperature permanent magnet by doping nano-Cu powder, which belongs to the technical field of rare-earth permanent magnetic material preparation. The method comprises the steps of: smelting a SmCoFeCuZr alloy ingot by the conventional powder metallurgy method; processing the SmCoFeCuZr alloy ingot to micrometer-level alloy powder; uniformly blending commercial nano-Cu powder and the SmCoFeCuZr alloy powder according to a ratio; sintering; and aging to obtain a 2:17 SmCosintered magnet. The doped nano-Cu powder has uniform distribution in the sintered magnet, so that the room-temperature and high-tempreature coercivity of the magnet can be improved greatly. The room-temperature coercivity can be improved by 2 to 2.5 times, and the 500 DEG C coercivity and magnetic energy of the magnet doped with the nano-Cu powder are significantly higher than those of undoped magnets. Accordingly, the magnet doped with the nano-Cu powder is very suitable for application in high-temperature environment.

Description

technical field [0001] A preparation method for improving the coercive force of a 2:17 type samarium cobalt permanent magnet belongs to the technical field of preparation of rare earth permanent magnet materials. Background technique [0002] At present, the rapid development of aerospace and national defense has put forward higher requirements for high-temperature permanent magnets, requiring magnets to often work in a temperature environment of 400°C to 500°C or even higher. This requires permanent magnet materials not only to have high magnetic properties, but also to have excellent high-temperature magnetic properties. Therefore, high-temperature permanent magnets have become a research hotspot for researchers again. [0003] The 2:17 type SmCo permanent magnet material has become the material of choice for high temperature permanent magnet applications due to its excellent magnetic properties, high Curie temperature and strong corrosion resistance. For high temperature...

Claims

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Application Information

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IPC IPC(8): H01F41/02B22F3/16C22C19/07
CPCB22F9/04C22C19/07B22F3/24C22C1/045H01F41/02B22F3/16B22F3/1007B22F3/04H01F1/0596
Inventor 张东涛岳明王剑侠刘卫强张久兴
Owner BEIJING UNIV OF TECH
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