Preparation method of samarium-cobalt permanent magnet suitable for high-temperature and high-pressure pure hydrogen environment

A high temperature and high pressure, samarium cobalt magnet technology, applied in the manufacture of inductors/transformers/magnets, electrical components, circuits, etc., can solve the problems of unusable materials, failure of samarium cobalt permanent magnet materials, etc., to increase the density and improve the intergranular Continuity, the effect of hindering the entry of hydrogen

Active Publication Date: 2021-09-28
HANGZHOU PERMANENT MAGNET GRP
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Problems solved by technology

[0006] In order to overcome the problem that the samarium cobalt permanent magnet material will fail in the hydrogen environment, especially for the problem that the samarium cobalt permanent magnet material is pulverized in the high temperature and high pressure pure hydrogen environment and the material cannot be used, the present invention provides a suitable Samarium cobalt permanent magnet material and preparation method thereof under high temperature and high pressure pure hydrogen environment

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  • Preparation method of samarium-cobalt permanent magnet suitable for high-temperature and high-pressure pure hydrogen environment
  • Preparation method of samarium-cobalt permanent magnet suitable for high-temperature and high-pressure pure hydrogen environment

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preparation example Construction

[0036] A samarium cobalt permanent magnet suitable for high temperature and high pressure pure hydrogen environment, its expression (excluding the coating) is: Sm(Co 1-x-y-v Fe x Cu y Zr v ) z, wherein x=0.18~0.26, y=0.14~0.2, v=0.01~0.03, z=7.0~7.5; z is the atomic ratio of transition group elements Co, Fe, Cu, Zr and rare earth element Sm, and its preparation method includes The following steps:

[0037] (1) According to the ratio of each element, the raw materials are melted in an inert environment to obtain alloy ingots or slabs.

[0038] (2) Crushing the obtained ingot or cast sheet under a nitrogen environment, and then jet milling under an inert environment to obtain samarium cobalt powder.

[0039] (3) The obtained samarium-cobalt powder is oriented and formed in an inert environment and a 1-5T magnetic field, and then cold isostatically pressed at 180-230MPa to obtain a samarium-cobalt magnet green body with a particle size of 3.8-4.5 μm.

[0040] (4) Sinter the...

Embodiment 1

[0043] A samarium cobalt permanent magnet suitable for high temperature and high pressure pure hydrogen environment, its expression (excluding the coating) is Sm(Co 0.65 Fe 0.18 Cu 0.15 Zr 0.02 ) 7.1 , the specific preparation steps are as follows:

[0044] (1) Put the samarium-cobalt magnet raw material into the vacuum melting induction furnace after batching according to the element ratio, and obtain the alloy ingot by melting in an inert environment;

[0045] (2) Pass the ingot obtained by smelting into nitrogen for crushing treatment, and then produce samarium cobalt powder with an average particle size of 4.1 μm through jet milling under an inert environment;

[0046] (3) Orientate the samarium-cobalt powder under the protection of argon gas and in a magnetic field (the magnetic field strength is 2T), and then perform cold isostatic pressing for 30 minutes (the pressure for cold isostatic pressing is 200MPa) to obtain a samarium-cobalt magnet green body;

[0047] (4...

Embodiment 2

[0051] A samarium cobalt permanent magnet suitable for high temperature and high pressure pure hydrogen environment, its expression (excluding the coating) is Sm(Co 0.61 Fe 0.2 Cu 0.16 Zr 0.03 ) 7.2 , the specific preparation steps are as follows:

[0052] (1) Put the samarium-cobalt magnet raw material into the vacuum melting induction furnace after batching according to the element ratio, and obtain the alloy ingot by melting in an inert environment;

[0053] (2) Pass the ingot obtained by smelting into nitrogen for crushing treatment, and then produce samarium cobalt powder with an average particle size of 4.1 μm through jet milling under an inert environment;

[0054] (3) Orientate the samarium-cobalt powder under the protection of argon gas and in a magnetic field (the magnetic field strength is 2T), and then perform cold isostatic pressing for 30 minutes (the pressure for cold isostatic pressing is 200MPa) to obtain a samarium-cobalt magnet green body;

[0055] (4)...

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Abstract

The invention relates to the field of permanent magnet materials, and discloses a preparation method of a samarium-cobalt permanent magnet suitable for a high-temperature and high-pressure pure hydrogen environment. The method comprises steps of (1) smelting, (2) crushing treatment and jet milling, (3) magnetic field orientation forming and cold isostatic pressing, (4) performing sintering, solid solution and aging treatment on the body, and (5) cleaning the surface of the samarium-cobalt magnet, and sequentially plating the surface of the samarium-cobalt magnet with a base body plating layer, an AlCrZnN plating layer and a DyNiAl plating layer. The plating layer prepared on the surface of the samarium-cobalt permanent magnet through the magnetron sputtering method is good in binding property and compactness and has excellent hydrogen resistance and high temperature resistance, and what is guaranteed is that the samarium-cobalt permanent magnet material is used in the high-temperature and high-pressure pure hydrogen environment.

Description

technical field [0001] The invention relates to the field of permanent magnet materials, in particular to a method for preparing a samarium-cobalt permanent magnet suitable for a high-temperature, high-pressure pure hydrogen environment. Background technique [0002] Compared with sintered NdFeB, sintered SmCo not only has excellent magnetic properties, but also has corrosion resistance and high temperature resistance and good high temperature stability. The research and development of samarium cobalt permanent magnet materials worldwide has been increasing continuously, and the research level of samarium cobalt permanent magnet materials in China is also improving year by year. Samarium cobalt permanent magnet materials play an irreplaceable role in specific occasions that require high operating temperature and high temperature stability, such as motors and generators used in aerospace, some cutting-edge applications such as traveling wave tubes (space exploration and satel...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01F41/02
CPCH01F41/0293
Inventor 赵宇徐道兵樊金奎王栋雷建卓宇
Owner HANGZHOU PERMANENT MAGNET GRP
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