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Preparation method for surface-treated samarium-cobalt permanent magnet

A surface treatment and permanent magnet technology, which is applied in the manufacture of permanent magnets, magnetic objects, inductors/transformers/magnets, etc., can solve the problems of poor corrosion resistance of alloys, easy rust, corrosion, damage, etc., and achieve excellent corrosion resistance sexual effect

Inactive Publication Date: 2018-11-27
苏州诺弘添恒材料科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Due to SmCo 5 The nature of the metal elements in the alloy is lively, which makes the corrosion resistance of the whole alloy very poor, especially in the hot and humid environment, it is easy to rust and corrode, and the magnetic properties are reduced or damaged due to corrosion failure, which seriously affects the The service life of NdFeB permanent magnet materials reduces the stability and reliability of products

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] The samarium cobalt permanent magnet material main body of the present embodiment is by following composition by general formula: Sm(Co 0.97 Ni 0.03 ) 4.8 Si 0.2 .

[0020] According to the above general formula, each element is weighed for batching; the batching is placed in the melting furnace, and the vacuum in the furnace reaches at least 5×10 -3 Pa; Then, pass helium gas until the pressure in the furnace is 50kPa; heat up to 1300°C to melt, stir, refine and cast into water-cooled copper molds for use.

[0021] The obtained alloy ingot is crushed, put into the quartz tube in the vacuum belt throwing machine, the diameter of the nozzle at the bottom of the quartz tube is 0.5 mm, after the chamber of the vacuum belt throwing machine is evacuated, the cavity is filled with protective gas; Turn on the power supply of the vacuum strip machine to heat and melt the alloy in the quartz tube. At the same time, control the distance between the nozzle at the bottom of the ...

Embodiment 2

[0027] The samarium cobalt permanent magnet material main body of the present embodiment is by following composition by general formula: Sm(Co 0.9 Ni 0.1 ) 4.5 Si 0.5 .

[0028] According to the above general formula, each element is weighed for batching; the batching is placed in the melting furnace, and the vacuum in the furnace reaches at least 5×10 -3 Pa; Then, pass helium gas until the pressure in the furnace is 80kPa; heat up to 1450°C to melt, stir, refine, and then cast it into a water-cooled copper mold for use.

[0029] The obtained alloy ingot is crushed and put into the quartz tube in the vacuum strip machine. The diameter of the nozzle at the bottom of the quartz tube is 0.8mm. After the cavity of the vacuum strip machine is vacuumed, fill the cavity with protective gas; Turn on the power supply of the vacuum strip machine to heat and melt the alloy in the quartz tube. At the same time, control the distance from the nozzle at the bottom end of the quartz tube ...

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Abstract

The invention discloses a preparation method for a surface-treated samarium-cobalt permanent magnet. The compositions of SmCo5 alloy are adjusted through doping so as to obtain a high super-cooling degree of the alloy compositions; through cooperation of a high-speed rapid quenching technology, anisotropic SmCo5 with the fine crystalline size is obtained. A neodymium-iron-boron permanent magnet material is subjected to surface treatment by using nanometer ceramics, so that the SmCo5 permanent magnet material has the advantages of being high in corrosion resistance, ultra-low in demagnetizationperformance, resistant to impact and the like.

Description

technical field [0001] The invention relates to the field of magnetic material manufacturing, in particular to a method for preparing a surface-treated samarium-cobalt permanent magnet. Background technique [0002] Rare earth permanent magnet materials refer to permanent magnet materials made of alloys formed of rare earth metals and transition metals through a certain process. Rare earth permanent magnet material is the permanent magnet material with the highest comprehensive performance known now, which is more than 100 times higher than the magnetic properties of the magnetic steel used in the 90th century, much superior to ferrite and AlNiCo, and more than The magnetic properties of expensive platinum-cobalt alloys are twice as high. Due to the use of rare earth permanent magnet materials, it not only promotes the miniaturization of permanent magnet devices and improves the performance of products, but also promotes the production of some special devices. Therefore, th...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01F1/058H01F41/02
CPCH01F1/058H01F41/026
Inventor 不公告发明人
Owner 苏州诺弘添恒材料科技有限公司
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