Samarium-cobalt alloy material, samarium-cobalt alloy powder, preparation method thereof, and samarium-cobalt-based magnet

A technology of alloy powder and alloy materials, which is applied in the field of samarium-cobalt-based magnets, can solve the problems of sensitive production conditions of samarium-cobalt magnets, the inability to stably prepare samarium-cobalt magnets, and the decline in yield, so as to achieve the optimization of hydrogen absorption industry and the improvement of hydrogen absorption performance , The effect of low equipment requirements

Active Publication Date: 2018-11-20
NINGBO INST OF MATERIALS TECH & ENG CHINESE ACADEMY OF SCI
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the increase of Fe content makes the production conditions of SmCo magnets extremely sensitive, and the yield rate decreases. In the current industrial production, it is still impossible to stably prepare SmCo magnets with high iron content. This process is difficult to be applied in industrial production.

Method used

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  • Samarium-cobalt alloy material, samarium-cobalt alloy powder, preparation method thereof, and samarium-cobalt-based magnet
  • Samarium-cobalt alloy material, samarium-cobalt alloy powder, preparation method thereof, and samarium-cobalt-based magnet
  • Samarium-cobalt alloy material, samarium-cobalt alloy powder, preparation method thereof, and samarium-cobalt-based magnet

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preparation example Construction

[0033] The present invention also provides a preparation method of samarium-cobalt alloy powder, which comprises the following steps:

[0034] S1, according to the above Sm(Co 1-a-b-c-d Fe a Cu b Zr c tm d ) z Prepare the samarium-cobalt alloy ingot with the ratio of each element in it;

[0035] S2, the samarium-cobalt alloy ingot is absorbed by hydrogen at a hydrogen pressure of 0.2MPa-0.5MPa and normal temperature for 0.5-5 hours, and then dehydrogenated by heat preservation to obtain samarium-cobalt alloy powder.

[0036] In step S2, the crushing mechanism of the hydrogen crushing process includes intergranular fracture and transgranular fracture. Compared with the mechanical crushing process, the hydrogen crushing process is more conducive to improving the degree of orientation of the material, thereby improving the remanence of the magnet. The hydrogen pressure range of the hydrogen absorption is 0.2MPa-0.3Mpa, and the hydrogen absorption time is 0.5 hour-1 hour. ...

Embodiment 1

[0050] According to the stoichiometric formula Sm(Co 0.655 Fe 0.2 Cu 0.08 Zr 0.025 mn 0.04 ) 7.2 The ratio of each element in the formula is to weigh the raw materials, put the raw materials in the induction melting furnace, and evacuate to 2×10 -2 Below Pa, then fill it with 0.06MPa high-purity argon gas, heat it with electricity, and pour it into a water-cooled splint copper mold after the raw material is completely melted into a liquid to obtain a samarium-cobalt alloy ingot.

[0051] Put the samarium-cobalt alloy ingot obtained above into a hydrogen furnace, pump the vacuum in the furnace to below 5Pa through a mechanical pump, and then fill it with hydrogen until the pressure is -0.08MPa, and then use a mechanical pump to reduce the vacuum in the furnace to below 5Pa. This is pumped down to below 5Pa, repeated scrubbing twice, then filled with hydrogen to a pressure of 300KPa, and then kept at room temperature for 1.5h for hydrogen absorption and crushing. Vacuumize...

Embodiment 2

[0055] The preparation method of the samarium-cobalt alloy powder of embodiment 2 is basically the same as that of embodiment 1, and the difference is that the raw material stoichiometric formula of the samarium-cobalt alloy powder is Sm(Co 0.655 Fe 0.2 Cu 0.08 Zr 0.025 Cr 0.04 ) 7.2 .

[0056] Carry out X-ray diffraction test to the obtained samarium-cobalt alloy powder, the result is shown in figure 1 . Depend on figure 1 It can be seen that the samarium cobalt alloy powder is made of SmCo 7 Phase, SmCo 5 Phase and SmCo 3 phase composition.

[0057] The obtained samarium-cobalt alloy powder is subjected to a morphology test, and the results are shown in Figure 4 . Depend on Figure 4 It can be seen that the samarium-cobalt alloy is successfully broken into particles of 10 μm to 150 μm, and the hydrogen-absorbing broken methods include intergranular fracture and transgranular fracture.

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Abstract

The invention discloses a samarium cobalt alloy material. The stoichiometric formula of the samarium cobalt alloy material is Sm(Co1-a-b-c-d Fea Cub Zrc TMd)z. The elements, which constitute TM, include Mn.Cr.V.Ti.Sc.Nb.Ta.Mo.W and TM consists of at least one of these elements. The content of each element is that a >=0 and <= 0.25, b >=0 and <=0.15, c >=0 and <= 0.04, d >0 and <= 0.1 and z >=6.8 and <= 8.5. The invention also discloses a samarium cobalt alloy powder, a method of producing the samarium cobalt alloy powder and a samarium cobalt magnet base.

Description

technical field [0001] The invention relates to the technical field of permanent magnet materials, in particular to a high-efficiency and energy-saving samarium-cobalt permanent magnet material, samarium-cobalt alloy powder and a preparation method thereof, and a samarium-cobalt-based magnet. Background technique [0002] 2:17 samarium cobalt alloy is widely used in aerospace, national defense and military industry, high temperature motor, electronic instrument and other fields because of its high Curie temperature, high coercive force, low temperature coefficient and excellent corrosion resistance. In recent years, as the quality and stability of electronic products such as mobile phones and other high-end communication equipment and automation instruments and meters have become higher and higher, the demand for samarium cobalt magnets will increase significantly. Therefore, many countries regard samarium cobalt as one of the key research objects in the field of materials. ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01F1/055B22F9/04B22F3/04B22F3/10B22F3/24
CPCB22F3/04B22F3/10B22F3/24B22F9/023B22F9/04B22F2003/248B22F2009/045H01F1/0551H01F1/0553
Inventor 王春晓刘雷孙颖莉刘壮冯艳萍张鑫李东闫阿儒
Owner NINGBO INST OF MATERIALS TECH & ENG CHINESE ACADEMY OF SCI
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