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High temperature resistant samarium cobalt permanent magnet and preparation method thereof

A permanent magnet, high temperature resistant technology, used in magnetic objects, inductance/transformer/magnet manufacturing, magnetic materials, etc. Few problems, to achieve the effect of improving magnetic performance, high coercivity, and high magnetic energy product

Inactive Publication Date: 2016-03-23
NINGBO STAR MATERIALS HI TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] However, the mechanical properties of samarium cobalt permanent magnet materials are generally poor, the bending strength is only 80-120MPa, and there is a fatal weakness, that is, its brittleness is very large, and its fracture toughness is less than 2.0MPa m 1 / 2 , seriously restricting its application range
However, for a long time, people's research on samarium cobalt permanent magnet materials has mainly focused on how to improve their magnetic properties, and there are few studies on mechanical properties.
[0004] Moreover, the current maximum operating temperature of SmCo permanent magnets can only reach 350°C. When used at higher temperatures, the Sm atoms in SmCo permanent magnets will slowly volatilize, resulting in the magnetic properties of SmCo permanent magnets being reduced accordingly. Slowly get worse until eventually it fails

Method used

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  • High temperature resistant samarium cobalt permanent magnet and preparation method thereof
  • High temperature resistant samarium cobalt permanent magnet and preparation method thereof
  • High temperature resistant samarium cobalt permanent magnet and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0046] According to the composition of the samarium-cobalt permanent magnet powder in Example 1 in Table 1 and its mass percentage, batching and smelting, the alloy solution obtained after smelting is poured on a rotating water-cooled copper roller in an inert atmosphere and cooled rapidly to obtain a thickness of 0.03mm. alloy sheet.

[0047] Then the prepared alloy sheet is subjected to hydrogen crushing to obtain powder, and the powder is not subjected to dehydrogenation treatment, but is directly processed into a powder with a particle size of 3-5 μm through a jet milling process.

[0048] Then, the glass fiber with a volume percentage content of 15% and the powder material with a volume percentage content of 85% are put into a molding press mold under the protection of an inert gas, and a magnetic field is applied for orientation. After orientation, press molding, demagnetization and vacuum packaging to obtain Green body, put the green body into the isostatic pressing pro...

Embodiment 2

[0052] According to the composition and mass percentage of the samarium cobalt permanent magnet powder of embodiment 2 in table 1, batching and smelting, the alloy solution obtained after smelting is poured on the rotating water-cooled copper roller in an inert atmosphere and cooled rapidly to obtain a 1mm thick alloy sheet.

[0053] Then the prepared alloy sheet is subjected to hydrogen crushing to obtain powder, and the powder is not subjected to dehydrogenation treatment, but is directly processed into a powder with a particle size of 3-5 μm through a jet milling process.

[0054] Then, put the aramid fiber with a volume percentage of 15% and the powder with a volume percentage of 85% under the protection of an inert gas into a molding press mold and apply a magnetic field for orientation. After orientation, press molding, demagnetization and vacuum packaging, Obtain the green body, put the green body into the isostatic pressing process, and then take it out.

[0055] Then...

Embodiment 3

[0058] According to the composition of the samarium-cobalt permanent magnetic powder of Example 3 in Table 1 and its mass percentage, batching and smelting, the alloy solution obtained after smelting is poured on the rotating water-cooled copper roll in an inert atmosphere and cooled rapidly to obtain a 3mm thick alloy sheet.

[0059] Then the prepared alloy sheet is subjected to hydrogen crushing to obtain powder, and the powder is not subjected to dehydrogenation treatment, but is directly processed into a powder with a particle size of 3-5 μm through a jet milling process.

[0060] Then, the carbon fiber with a volume percentage content of 15% and the powder material with a volume percentage content of 85% are put into a molding press mold under the protection of an inert gas, and a magnetic field is applied for orientation. After orientation, press molding, demagnetization and vacuum packaging to obtain raw The green body is put into the isostatic pressing process and then...

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Abstract

The present invention relates to a high temperature resistant samarium cobalt permanent magnet and a preparation method thereof. The high temperature resistant samarium cobalt permanent magnet comprises a samarium cobalt permanent magnet material core layer and a ceramic protective layer, wherein the samarium cobalt permanent magnet material is externally coated with the ceramic protective layer, and the samarium cobalt permanent magnet material comprises a reinforcing fiber of 10-20% volume percent and a samarium cobalt permanent magnet powder of 80-90% volume percent. The samarium cobalt permanent magnet is prepared by using the following preparation method: performing batching according to components and mass percentages thereof of the samarium cobalt permanent magnet powder, and performing melting and quick solidification to obtain an alloy sheet; performing hydrogen decrepitation on the alloy sheet to obtain a powder; grinding the powder into a powder material by means of a jet mill directly; performing press forming on the reinforcing fiber and the powder material to obtain a green body; and subjecting the green body to high temperature sintering and heat treatment, and forming the ceramic protective layer on the surface, thereby obtaining the high temperature resistant samarium cobalt permanent magnet. The samarium cobalt permanent magnet obtained by using the method provided by the present invention has both a high magnetic property and a high mechanical property, also has good high temperature resistance, and is applicable in a high temperature environment of 500 DEG.C or above.

Description

technical field [0001] The invention relates to a permanent magnet material and a preparation method thereof, in particular to a high-temperature-resistant samarium-cobalt permanent magnet and a preparation method thereof, belonging to the field of rare earth permanent magnet materials. Background technique [0002] Samarium-cobalt permanent magnet material is a kind of magnetic material made of samarium, cobalt and other metal rare earth materials, which are melted into alloys, crushed, pressed and sintered. With high magnetic energy product, extremely low temperature coefficient, strong corrosion resistance and oxidation resistance, it is widely used in aerospace, national defense and military industry, microwave devices, communications, medical equipment, instruments, meters, various magnetic transmission devices, Sensors, Magnetic Processors, Motors, Magnetic Lifters, etc. [0003] However, the mechanical properties of samarium cobalt permanent magnet materials are gene...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01F1/055H01F41/02C22C19/07B22F9/04B22F3/16
Inventor 潘道良苏广春关井和胡剑
Owner NINGBO STAR MATERIALS HI TECH
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