Samarium cobalt alloy material, samarium cobalt alloy powder, samarium cobalt magnet base and method of producing samarium cobalt alloy powder
An alloy material and alloy powder technology, applied in the field of samarium cobalt-based magnets, can solve the problems of inability to stably prepare samarium cobalt magnets, sensitive production conditions of samarium cobalt magnets, decrease in yield, etc., and achieve the optimization of hydrogen absorption industry, low equipment requirements, The effect of improving the hydrogen absorption performance
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[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. After pumping it below 5Pa, repeat the gas washing twice, then fill it with hydrogen until the pressure is 300KPa, and then keep it at room temperature for 1.5h to carry out hydrogen absorption and crus...
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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