High temperature resistant samarium cobalt permanent magnet and preparation method thereof

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...

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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

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