Samarium-cobalt sintered magnet material and preparation method thereof

A sintered magnet, samarium cobalt technology, applied in the direction of magnetic materials, magnetic objects, electrical components, etc., can solve the problems of complex process, high industrialization cost, and the decline of permanent magnet magnetic performance, so as to improve the magnetic energy product, promote industrialization, The effect of reducing the temperature coefficient of remanence

Inactive Publication Date: 2010-11-10
NINGBO INST OF MATERIALS TECH & ENG CHINESE ACADEMY OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In the traditional process, the temperature coefficient of the 2:17 type Sm-(Co, Cu, Fe, M) permanent magnet can reach -0.02% / ℃ by adding heavy rare earth elements, but on the other hand, the magnetic properties of the permanent magnet There will also be a greater degree of decline (such as the disclosure of the Chinese invention patent specification CN1065153)
[0009] Chinese Invention Patent Application Publication CN1933042 discloses a method for reducing the temperature coefficient of rare earth permanent magnets. The method is to coat a layer of ternary alloy containing Ni, Mo and Fe on the surface of rare earth permanent magnets to provide temperature coefficient compensation, thereby improving The temperature stability of the magnet, but this method is complex and the cost of industrialization is high

Method used

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  • Samarium-cobalt sintered magnet material and preparation method thereof
  • Samarium-cobalt sintered magnet material and preparation method thereof
  • Samarium-cobalt sintered magnet material and preparation method thereof

Examples

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Embodiment 1

[0035] Raw materials: Samarium, Cobalt, Iron, Copper, Zirconium, Gadolinium, Dysprosium.

[0036] The above raw materials are compounded by mass percentage, wherein samarium accounts for 18.14%, cobalt accounts for 51.71%, iron accounts for 13.90%, copper accounts for 6.33%, zirconium accounts for 1.70%, gadolinium accounts for 5.42%, and dysprosium accounts for 2.80%.

[0037] In the quick-setting furnace, the above ingredients are smelted into alloys, and then cast into thin strip-shaped quick-setting sheets on water-cooled copper rollers; the quick-setting sheets are ground by a two-stage grinding process, and the quick-setting sheets are first coarsely crushed for disc grinding. The medium is gasoline, and the quick-setting sheet is ground into magnetic powder with a particle size of about 100 μm, and then the magnetic powder is calcined under vacuum conditions to obtain dry magnetic powder at a calcination temperature of 100 degrees; the obtained dry magnetic powder is subje...

Embodiment 2

[0054] Raw materials: Samarium, Cobalt, Iron, Copper, Zirconium, Dysprosium.

[0055] The above raw materials are compounded in mass percentage, wherein samarium accounts for 20.78%, cobalt accounts for 51.81%, iron accounts for 13.93%, copper accounts for 6.34%, zirconium accounts for 1.71%, and dysprosium accounts for 5.43%.

[0056] In the quick-setting furnace, the above ingredients are smelted into alloys, and then cast into thin strip-shaped quick-setting sheets on water-cooled copper rollers; the quick-setting sheets are ground by a two-stage grinding process, and the quick-setting sheets are first coarsely crushed for disc grinding. The medium is gasoline, and the quick-setting sheet is ground into magnetic powder with a particle size of about 100 μm, and then the magnetic powder is calcined under vacuum conditions to obtain dry magnetic powder at a calcination temperature of 100 degrees; the obtained dry magnetic powder is subjected to jet milling, and the powder parti...

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Abstract

The invention discloses a 2:17 type samarium-cobalt sintered magnet material and a preparation method thereof. The 2:17 type samarium-cobalt sintered magnet material comprises the following raw materials in percentage by mass: 10 to 25 percent of samarium, 45 to 55 percent of cobalt, 10 to 20 percent of iron, 3 to 9 percent of copper, 1 to 3 percent of zirconium and 5 to 15 percent of at least one heavy rear earth element. Due to the selection and the proportion of the raw materials and the innovation of the sintering process, a microstructure of the magnet material is optimized, and the aims of reducing the temperature coefficient of a magnet and simultaneously maintaining higher magnetic energy product of the magnet are fulfilled, wherein the magnetic energy product of the prepared magnet is 14 to 25 MGsOe, the residual magnetism temperature coefficient is about -0.005 to -0.03 percent per DEG C, and a lower magnetic flux temperature coefficient is maintained in an environment at the temperature of between -35 and 300 DEG C.

Description

technical field [0001] The invention relates to the technical field of samarium-cobalt series magnet materials, in particular to a 2:17 type samarium-cobalt series sintered magnet material with low temperature coefficient and a preparation method thereof. Background technique [0002] Samarium cobalt (SmCo) permanent magnet alloy is a kind of high Curie temperature, high intrinsic coercive force (H cj ) and permanent magnet materials with low intrinsic coercive force temperature coefficient are generally considered to be the most promising permanent magnet materials for high temperature applications. At present, samarium-cobalt permanent magnets are one of the key research objects in the field of materials in western countries. They are mainly used in important military fields such as aerospace, aviation, and navigation, especially for new-generation weapon systems, such as new-generation fighters, wireless Power systems and radar communication systems for man-machines and ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01F1/053C22C19/07C22C30/02C22C1/04C22F1/16
Inventor 刘壮孙颖丽刘兴民李东闫阿儒
Owner NINGBO INST OF MATERIALS TECH & ENG CHINESE ACADEMY OF SCI
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