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Samarium-cobalt permanent magnet material and preparation method thereof

A permanent magnet material, samarium cobalt technology, applied in the direction of magnetic materials, magnetic objects, electrical components, etc., can solve the problems that need to be further improved, and achieve the effect of reducing oxygen content, reducing oxidation, and improving the ability of demagnetization effect

Inactive Publication Date: 2011-05-25
NINGBO STAR MATERIALS HI TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the room temperature intrinsic coercive force of rare earth permanent magnet materials such as 2:17 samarium cobalt permanent magnet materials in the existing technology is generally 20KOe, and its ability to resist external reverse magnetic fields or other demagnetization effects still needs to be further improved.

Method used

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  • Samarium-cobalt permanent magnet material and preparation method thereof

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] Raw materials: Samarium, Cobalt, Iron, Copper, Zirconium, Erbium.

[0022] The above-mentioned raw materials are batched in mass percentage, wherein 25.5% of samarium, 49.1% of cobalt, 15% of iron, 7% of copper, 2.8% of zirconium and 0.6% of erbium.

[0023] The samarium cobalt permanent magnet material of the present invention comprises the following steps:

[0024] (1) Compounding samarium, cobalt, iron, copper, zirconium and erbium according to mass percentage.

[0025] (2) Put the prepared raw materials into a vacuum intermediate frequency induction furnace for smelting, and after they are completely melted, keep them warm for 5 minutes at a temperature of 1430-1450°C for alloy refining. After refining, pour them into a water-cooled copper mold to obtain samarium cobalt alloy.

[0026] (3) Put the samarium-cobalt alloy into a tube-type vacuum sintering furnace, feed hydrogen gas, make the hydrogen pressure reach 1MPa, raise the temperature to 150° C. and keep it w...

Embodiment 2

[0032] Raw materials: Samarium, Cobalt, Iron, Copper, Zirconium, Erbium.

[0033] The above-mentioned raw materials are compounded in mass percentage, including 25.2% of samarium, 48.3% of cobalt, 16.2% of iron, 5.9% of copper, 3.2% of zirconium and 1.2% of erbium.

[0034] The preparation method of the samarium cobalt permanent magnet material of the present invention is the same as that of embodiment 1.

[0035] The relevant magnetic performance parameters of the obtained samarium-cobalt magnets were tested, as shown in Table 1.

Embodiment 3

[0037] Raw materials: Samarium, Cobalt, Iron, Copper, Zirconium, Erbium.

[0038] The above-mentioned raw materials are batched in mass percentage, including 25.6% of samarium, 49.6% of cobalt, 13.5% of iron, 6.8% of copper, 2.9% of zirconium and 1.6% of erbium.

[0039] The preparation method of the samarium cobalt permanent magnet material of the present invention is the same as that of embodiment 1.

[0040] The relevant magnetic performance parameters of the obtained samarium-cobalt magnets were tested, as shown in Table 1.

[0041] Table 1

[0042]

[0043] The magnetic performance test parameters of each embodiment in Table 1 show that the samarium cobalt permanent magnet material prepared by the present invention has high coercive force, and has a higher ability to resist external reverse magnetic fields or other demagnetization effects than in the prior art.

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Abstract

The invention provides a samarium-cobalt permanent magnet material, which consists of the following components in percentage by mass: 23 to 25.5 percent of samarium, 44 to 50 percent of cobalt, 14 to 20 percent of iron, 3 to 8 percent of copper, 2 to 4 percent of zirconium and 0.5 to 2 percent of heavy rare earth element. The invention also provides a method for preparing the samarium-cobalt permanent magnet material, which comprises the following steps of: mixing; smelting alloys; preparing magnetic power; orienting and forming; sintering and performing solid solution; and ageing. The samarium-cobalt permanent magnet material has the characteristic of high coercive force and can effectively meet the requirement of the field of high and new technology on the high coercive force of a rare earth permanent magnet material.

Description

technical field [0001] The invention relates to the technical field of rare earth permanent magnet materials, in particular to a samarium cobalt permanent magnet material with high coercive force and a preparation method thereof. Background technique [0002] Rare earth permanent magnet materials refer to permanent magnet materials made of alloys formed by rare earth metals and transition metals through a certain process. Due to their high magnetic energy product, stable magnetism and good mechanical properties, they are used in machinery, electronics, It is widely used in instrumentation and medical fields. So far, the rare earth permanent magnet materials of the existing technology, such as the 2:17 type samarium cobalt permanent magnet material called the second generation permanent magnet material in the industry, have a Curie temperature of more than 800°C and can be applied at a maximum of 400-500°C In some occasions, the temperature coefficient is small, and the magn...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C19/07C22C30/02C22C1/04H01F1/055
Inventor 潘道良苏广春关井和
Owner NINGBO STAR MATERIALS HI TECH
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