A kind of high temperature resistant samarium cobalt permanent magnet and preparation method thereof

A permanent magnet, high temperature resistant technology, used in the manufacture of permanent magnets, magnets, permanent magnets, etc. It can solve the problems of applications that cannot meet high temperature, the magnetic field of samarium cobalt permanent magnets is unstable, and cannot be used in high temperature applications, and achieve excellent anti-corrosion. effect, excellent high temperature resistance, effect of improving heat resistance

Active Publication Date: 2020-12-29
上海景瑞阳实业有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, practice has proved that after exceeding 350°C, the magnetic field of SmCo permanent magnets will become unstable, and even completely demagnetize after exceeding 670°C, which cannot meet some high-temperature applications.
Sheng Mingzhong (Preparation process of SmCo permanent magnets with low temperature coefficient 2:17 [J]. Huadong Science and Technology: Academic Edition, 2015 (6): 3-3) mentioned that the actual use temperature of SmCo permanent magnets widely used at present is 20 ~ 300 ℃, can not be used in high temperature occasions

Method used

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  • A kind of high temperature resistant samarium cobalt permanent magnet and preparation method thereof
  • A kind of high temperature resistant samarium cobalt permanent magnet and preparation method thereof
  • A kind of high temperature resistant samarium cobalt permanent magnet and preparation method thereof

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preparation example Construction

[0028] The present invention provides a method for preparing the high-temperature-resistant samarium-cobalt permanent magnet described in the above technical solution, comprising the following steps:

[0029] Plating copper on the surface of the samarium cobalt permanent magnet substrate to obtain a samarium cobalt permanent magnet covered with copper plating;

[0030] A nano-carbon material layer is deposited on the surface of the samarium-cobalt permanent magnet covered with copper plating to obtain a high-temperature-resistant samarium-cobalt permanent magnet.

[0031] In the invention, copper is plated on the surface of the samarium-cobalt permanent magnet substrate to obtain the samarium-cobalt permanent magnet covered with the copper coating. The present invention has no special limitation on the preparation method of the samarium-cobalt permanent magnet matrix, and the preparation method of the samarium-cobalt permanent magnet well-known in the art can be adopted, and s...

Embodiment 1

[0040] Referring to the preparation method of Chinese patent CN107316726A embodiment 6, a samarium-cobalt permanent magnet substrate is prepared, wherein the molar ratio of samarium-cobalt is 2:17;

[0041]With reference to the method of Chinese Patent CN101405435B Example 1, copper-plate the surface of the samarium-cobalt permanent magnet substrate to obtain a copper coating. The size of the copper particles in the copper coating is 10-20 nm, and the thickness of the copper coating is 25 μm; Methane was introduced, water vapor was introduced at a rate of 1L / min, protected by high-purity argon, and chemical vapor deposition was carried out at 850°C to obtain a nano-carbon material layer. The thickness of the nano-carbon material layer was 60 μm. High temperature samarium cobalt permanent magnet.

[0042] The service temperature range of the obtained high-temperature-resistant samarium-cobalt permanent magnet is -50 to 500°C, and the salt spray resistance time is 180h (the test...

Embodiment 2

[0044] Referring to the preparation method of Chinese patent CN107316726A embodiment 6, a samarium-cobalt permanent magnet substrate is prepared, wherein the molar ratio of samarium-cobalt is 2:17;

[0045] With reference to the method of Chinese Patent CN101405435B Example 1, copper-plate the surface of the samarium-cobalt permanent magnet substrate to obtain a copper coating. The size of the copper particles in the copper coating is 5 nm, and the thickness of the copper coating is 20 μm; Acetylene was fed with water vapor at a rate of 2L / min, protected by high-purity nitrogen, and chemical vapor deposition was carried out at 850°C to obtain a nano-carbon material layer. The thickness of the nano-carbon material layer was 80 μm, and a high-temperature resistant samarium cobalt was prepared Permanent magnets.

[0046] The service temperature range of the obtained high-temperature-resistant samarium-cobalt permanent magnet is -40 to 600°C, and the salt spray resistance time is ...

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Abstract

The invention relates to the technical field of permanent magnets, and particularly relates to a high-temperature-resistant samarium-cobalt permanent magnet and a preparation method thereof. The high-temperature-resistant samarium-cobalt permanent magnet provided by the invention comprises a samarium-cobalt permanent magnet base body, a copper plating layer arranged on the surface of the samarium-cobalt permanent magnet base body and a nano carbon material layer arranged on the surface of the copper plating layer. According to the invention, the heat resistance of the samarium-cobalt permanentmagnet is improved by utilizing the thermal insulation property of the nano carbon material layer, so that the samarium-cobalt permanent magnet can be used in an environment of 500 DEG C or above. Inthe invention, the copper plating layer is used as a growth auxiliary agent, which is beneficial to ensuring the generation of the nano carbon material layer. The samarium-cobalt permanent magnet provided by the invention has excellent high temperature resistance and can be applied to novel low-field nuclear magnetic equipment. In addition, the samarium-cobalt permanent magnet provided by the invention also has an excellent anti-corrosion effect, and the salt spray resistance time is up to 360 hours.

Description

technical field [0001] The invention relates to the technical field of permanent magnets, in particular to a high-temperature-resistant samarium-cobalt permanent magnet and a preparation method thereof. Background technique [0002] Samarium cobalt magnet is the second generation rare earth permanent magnet, mainly divided into 1:5 type (SmCo 5 ) and 2:17 type (Sm 2 co 17 ) two kinds. The main characteristics of samarium cobalt permanent magnets are high magnetic performance and good temperature performance, and the maximum working temperature can reach 250-350 ℃. However, practice has proved that when the temperature exceeds 350°C, the magnetic field of the samarium-cobalt permanent magnet will become unstable, and it will even be completely demagnetized when the temperature exceeds 670°C, which cannot meet some high-temperature applications. Sheng Mingzhong (Preparation process of SmCo permanent magnets with low temperature coefficient 2:17 [J]. Huadong Science and Tec...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01F7/02H01F27/23H01F1/055H01F41/02
CPCH01F1/055H01F7/0221H01F27/23H01F41/026
Inventor 段兴汉武桐
Owner 上海景瑞阳实业有限公司
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