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Regeneration method of unqualified samarium-cobalt permanent magnets

A permanent magnet, samarium cobalt technology, which is applied in the manufacture of magnetic objects, magnetic materials, inductors/transformers/magnets, etc., can solve the problems of poor mechanical properties of samarium cobalt permanent magnets, high cost of samarium cobalt permanent magnets, and increased volatilization of samarium metal. , to improve the coercivity and mechanical properties, reduce the size of the cell structure, and increase the thickness of the cell wall phase.

Active Publication Date: 2021-05-04
河北泛磁聚智电子元件制造有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

More cobalt metal is used in samarium cobalt permanent magnets (48%-52% according to mass percentage). As one of the important strategic resources, cobalt metal is expensive, resulting in higher cost of samarium cobalt permanent magnets
Due to the poor mechanical properties and high brittleness of SmCo permanent magnets, the sintered blank may have defects such as internal cracks, and there may also be edge chipping during processing, resulting in waste of magnets and increased production costs.
In order to realize the recycling of unqualified samarium cobalt permanent magnets, in the prior art, such as patent CN106222489A discloses a regeneration process of samarium cobalt leftovers, which cleans the leftovers and adds a certain proportion of metal samarium and Metal copper is re-smelted, pulverized, and then mixed with normal alloy powder to realize the regeneration of samarium-cobalt scraps. This production method is complicated, the energy consumption of smelting is large, and the volatilization of samarium metal is increased. It is only suitable for the recovery of small batches of scraps. Reuse

Method used

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  • Regeneration method of unqualified samarium-cobalt permanent magnets

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0040] (1) Ultrasonic cleaning: Use metal cleaning agent to prepare 20-40g / L cleaning solution and stir evenly. The temperature of the cleaning solution is kept at 40°C-50°C. Rub and wash for at least 2 minutes, then use a hair dryer to dry after washing with 3 levels of water;

[0041] (2) Preparation of alloy powder a: use a jaw crusher to crush the unqualified samarium-cobalt permanent magnets into coarse particles with a particle size of less than 3 mm, and use a vibrating screen to oxidize the surface of the unqualified samarium-cobalt magnets Remove the skin, then crush the above-mentioned coarse particles to obtain a powder with a particle size of less than 200 μm, add the first additive accounting for 0.015% of the powder mass to the obtained powder, use a three-dimensional powder mixer to mix the powder for 2.5 hours, and mix the powder with the first Mix the additives evenly, and then use jet milling technology to obtain alloy powder a with a particle size of 3-5 μm. D...

Embodiment 2

[0048] (1) Ultrasonic cleaning: Use metal cleaning agent to prepare 20-40g / L cleaning solution and stir evenly. The temperature of the cleaning solution is kept at 40°C-50°C. Rub and wash for at least 2 minutes, then use a hair dryer to dry after washing with 3 levels of water;

[0049] (2) Preparation of alloy powder a: use a jaw crusher to crush the unqualified samarium-cobalt permanent magnets into coarse particles with a particle size of less than 3 mm, and use a vibrating screen to oxidize the surface of the unqualified samarium-cobalt magnets Remove the skin, then crush the above-mentioned coarse particles to obtain a powder with a particle size of less than 200 μm, add the first additive accounting for 0.015% of the powder mass to the obtained powder, use a three-dimensional powder mixer to mix the powder for 2.5 hours, and mix the powder with the first Mix the additives evenly, and then use jet milling technology to obtain alloy powder a with a particle size of 3-5 μm....

Embodiment 3

[0056] (1) Ultrasonic cleaning: Use metal cleaning agent to prepare 20-40g / L cleaning solution and stir evenly. The temperature of the cleaning solution is kept at 40°C-50°C. Rub and wash for at least 2 minutes, then use a hair dryer to dry after washing with 3 levels of water;

[0057] (2) Preparation of alloy powder a: use a jaw crusher to crush the unqualified samarium-cobalt permanent magnets into coarse particles with a particle size of less than 3 mm, and use a vibrating screen to oxidize the surface of the unqualified samarium-cobalt magnets Remove the skin, then crush the above-mentioned coarse particles to obtain a powder with a particle size of less than 200 μm, add the first additive accounting for 0.015% of the powder mass to the obtained powder, use a three-dimensional powder mixer to mix the powder for 2.5 hours, and mix the powder with the first Mix the additives evenly, and then use jet milling technology to obtain alloy powder a with a particle size of 3-5 μm....

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Abstract

The invention discloses a regeneration method of unqualified samarium-cobalt permanent magnets. The regeneration method comprises the following steps that 1, the unqualified samarium-cobalt permanent magnets are cleaned, dried and crushed to obtain alloy powder a with the particle size of 3-5[mu]m; 2, samarium metal is crushed under the protection of nitrogen until the particle size is 2-3 [mu]m. and an antioxidant accounting for 0.15%-0.025% of the mass of the samarium metal is added under the protection of argon, and grinding is conducted until the particle size is 200-500 nm to obtain samarium metal powder b; 3, the alloy powder a and the samarium metal powder b are mixed according to the following mass percent, a ranges from 92% to 97%, and the balance is b; and 4, the evenly-mixed alloy powder is subjected to compression molding, sintering, solid solution treatment and tempering treatment, and a samarium cobalt blank is obtained. The regeneration method has the advantages of being low in energy consumption, simple in production process, high in production efficiency, and suitable for recycling and reusing the unqualified samarium-cobalt permanent magnets on a large scale.

Description

technical field [0001] The invention relates to the field of samarium cobalt permanent magnets. More specifically, the present invention relates to a method for regenerating unqualified samarium cobalt permanent magnets. Background technique [0002] Samarium-cobalt permanent magnets have excellent high-temperature magnetic properties, low temperature coefficient, good oxidation resistance and corrosion resistance, and the maximum working temperature can reach 350 ° C. They are widely used in aerospace, national defense, high-end motors and other fields. More cobalt metal (48%-52% according to the mass percentage) is used in the samarium cobalt permanent magnet. As one of the important strategic resources, the cobalt metal is expensive, resulting in higher cost of the samarium cobalt permanent magnet. Due to the poor mechanical properties and high brittleness of samarium cobalt permanent magnets, the sintered blank may have internal cracks and other defects, and there may a...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22F9/04B22F1/00B22F3/04B22F3/10B22F3/24H01F41/02H01F1/055
CPCB22F9/04B22F3/04B22F3/1007B22F3/24H01F41/0266H01F1/0556B22F2003/248B22F2999/00B22F1/052B22F1/10B22F2201/20B22F2201/11
Inventor 姚溥
Owner 河北泛磁聚智电子元件制造有限公司
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