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Preparation method of samarium-cobalt (SmCo) system sintered materials

A sintered material, samarium cobalt technology, used in magnetic materials, inductor/transformer/magnet manufacturing, magnetic objects, etc., can solve the problems of sintered magnet performance degradation, high thermal deformation, multiple energy loss, etc., to optimize the microstructure, ensure Magnetic properties, effect of low oxygen content

Active Publication Date: 2015-05-20
NINGBO STAR MATERIALS HI TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] For samarium cobalt permanent magnet materials, the preparation of strong anisotropic nanocrystalline permanent magnet alloys has always been one of the difficulties, which requires high thermal deformation to obtain, so it requires high technical requirements and more energy loss
[0006] Chinese patent application 201110376723 discloses a method for preparing anisotropic samarium cobalt nanocrystalline rare earth permanent magnets, but the crushing of the alloy ingot and the grinding of the alloy powder are actually very easy to destroy the anisotropy of the magnetic powder, and it is easy to attract other people. impurities, resulting in a decrease in the performance of the sintered magnet

Method used

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  • Preparation method of samarium-cobalt (SmCo) system sintered materials

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Embodiment 1

[0028] Raw materials were weighed according to the following weight fractions: samarium: 16.9%; cobalt: 49%; iron: 15.5%; copper: 6.3%; zirconium: 2.6%; dysprosium: 1.6%; gadolinium: 5.42%;

[0029] 1) Alloy smelting: mix Sm, Co with a purity greater than 99.9% and alloying elements according to the ratio, place the water-cooled copper crucible in the electric arc furnace, and evacuate to 10 -3 Pa or above, then pass high-purity argon gas at 0.1 atmospheric pressure, working voltage 30V, working current 630A, and repeatedly smelt 4 times under the protection of argon gas to obtain an alloy liquid with uniform composition;

[0030] 2) Rapid quenching: casting the uniformly smelted alloy liquid onto a rotating water-cooled copper roll, water-cooled molybdenum roll, copper plate or molybdenum plate at a speed of 0.6m / s to prepare an alloy cast strip;

[0031] 3) Magnetic powder preparation: carry out the hydrogenation and disproportionation reaction of the alloy casting strip, th...

Embodiment 2

[0039] Raw materials were weighed according to the following weight fractions: samarium: 20.78%; cobalt: 51.81%; iron: 13.93%; copper: 6.34%; zirconium: 1.71%; dysprosium: 5.43%.

[0040] 1) Alloy smelting: mix Sm, Co with a purity greater than 99.9% and alloying elements according to the ratio, place the water-cooled copper crucible in the electric arc furnace, and evacuate to 10 -3 Pa, then introduce high-purity argon gas at 1.2 atmospheric pressure, working voltage 45V, working current 750A, and repeatedly smelt 4 times under the protection of argon gas to obtain an alloy liquid with uniform composition;

[0041] 2) Rapid quenching: casting the uniformly smelted alloy liquid onto a rotating water-cooled copper roll, water-cooled molybdenum roll, copper plate or molybdenum plate at a speed of 0.6m / s to prepare an alloy cast strip;

[0042] 3) Magnetic powder preparation: carry out the hydrogenation and disproportionation reaction of the alloy cast strip, the hydrogenation di...

Embodiment 3

[0050] Raw materials were weighed according to the following weight fractions: samarium: 16.9%; cobalt: 49%; iron: 15.5%; copper: 6.3%; zirconium: 2.6%; dysprosium: 1.6%; gadolinium: 5.8%;

[0051] 1) Alloy smelting: mix Sm, Co with a purity greater than 99.9% and alloying elements according to the ratio, place the water-cooled copper crucible in the electric arc furnace, and evacuate to 10 -3 Pa, then pass high-purity argon gas at 1.0 atmospheric pressure, working voltage 35V, working current 700A, and repeatedly smelt 3 times under the protection of argon gas to obtain an alloy liquid with uniform composition;

[0052] 2) Rapid quenching: casting the uniformly smelted alloy liquid onto a rotating water-cooled copper roll, water-cooled molybdenum roll, copper disc or molybdenum disc at a speed of 0.4m / s to prepare an alloy cast strip;

[0053] 3) Magnetic powder preparation: carry out the hydrogenation and disproportionation reaction of the alloy casting strip, the hydrogenat...

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Abstract

The invention relates to a preparation method of samarium-cobalt (SmCo) system sintered materials. The preparation method comprises the steps of alloy smelting, alloy cast strip preparation through rapid quenching, magnetic powder preparation through combination of a hydrogenated disproportionation method and an airflow grinding method, orientation and forming, positive pressure sintering and solid dissolving and aging treatment. The preparation method has the advantages that through the innovation of the ingot casting and powder making process, the microstructure of a magnetic body is optimized to the greatest degree, the magnetic body mainly consists of columnar crystals, the orientation is easy, and in addition, the performance of the magnetic body is stable; and in the hydrogenated disproportionation process of alloy cast sheets, hydrogen enters gap positions in SmCo crystal lattices, and the crystal lattice expansion is caused, so the pulverization is realized under the condition of ensuring the crystal particle integrity, the oxidation in the powder making process is reduced, the magnetic body with low oxygen content is obtained, and the magnetic performance of the magnetic body is ensured.

Description

technical field [0001] The invention relates to a rare earth permanent magnet material, in particular to a preparation method of a samarium cobalt series sintered material. Background technique [0002] In recent years, the continuous development of functional materials has effectively promoted the social progress of human society. Permanent magnetic materials are one of the functional materials. Due to their energy conversion function and various magnetic physical effects, they have been widely used in today's information society. . Rare earth permanent magnet material is the permanent magnet material with the highest comprehensive performance known at present. Its magnetic performance is more than 100 times higher than that of magnet steel, and its performance is much superior to that of ferrite and alnico. Since the use of rare earth permanent magnet materials not only promotes the miniaturization of permanent magnet devices and improves the performance of products, but ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01F1/053H01F41/02B22F9/16
Inventor 潘道良苏广春关井和
Owner NINGBO STAR MATERIALS HI TECH
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