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Preparation method of manganese bismuth permanent magnet material with electroplating layer

A permanent magnet material and electroplating technology, which is applied in the direction of magnetic materials, permanent magnet manufacturing, inductor/transformer/magnet manufacturing, etc., can solve problems such as drumming, foaming, affecting the anti-corrosion ability of the coating, and coating failure, so as to avoid coating The effect of drumming, improving anti-corrosion performance and stabilizing permanent magnet performance

Inactive Publication Date: 2018-03-13
SUZHOU NANER MATERIAL TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

There will be hydrogen evolution effect during the pretreatment and electroplating process, and the generated hydrogen will infiltrate and adsorb in the micropores on the surface of the substrate. When the concentration is high, the adsorbed hydrogen will overflow due to expansion, which will generate a pressure on the coating, causing the coating to protrude from the substrate, forming bulging and foaming, resulting in failure of the coating and seriously affecting the anti-corrosion ability of the coating.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] The chemical formula of the main body of the permanent magnetic material in this embodiment is Mn 57 Bi 42 Al 1 .

[0024] Weigh the elements according to the above chemical formula for ingredients; place the ingredients in the smelting furnace, and vacuum at least 5×10 in the furnace -3 Pa; Then, vent helium to the furnace pressure to 50kPa; heat up to 1300°C to melt, stir, refine and cast into a water-cooled copper mold for later use.

[0025] The obtained alloy ingot is crushed and put into the quartz tube in the vacuum stripping machine. The nozzle at the bottom of the quartz tube has a diameter of 0.5mm. After the cavity of the vacuum stripping machine is evacuated, the cavity is filled with protective gas; Turn on the power of the vacuum stripping 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 quartz tube and the surface of the copper roller to be 1mm, and adjust the copper roller spe...

Embodiment 2

[0030] The chemical formula of the main body of the permanent magnetic material in this embodiment is Mn 52 Bi 45 Al 3 .

[0031] Weigh the elements according to the above chemical formula for ingredients; place the ingredients in the smelting furnace, and vacuum at least 5×10 in the furnace -3 Pa; Then, vent helium to the furnace pressure to 80kPa; heat up to 1450°C to melt, stir, refining, and cast into a water-cooled copper mold for later use.

[0032] The obtained alloy ingot is crushed and put into the quartz tube in the vacuum stripping machine. The nozzle at the bottom of the quartz tube has a diameter of 0.8mm. After evacuating the cavity of the vacuum stripping machine, the cavity is filled with protective gas; Turn on the power of the vacuum stripping 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 quartz tube and the surface of the copper roller to be 1-5mm, and adjust the copper roller ...

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Abstract

The invention discloses a preparation method of a manganese bismuth permanent magnet material with an electroplating layer. The permanent magnet material prepared by the method has excellent and stable permanent magnet performance, and can be obtained through a simple and easily-implemented preparation method; and the surface of the permanent magnet is electroplated with a coating layer, so that bulging and bubble forming caused by a hydrogen evolution effect can be avoided, and corrosion resistance of the permanent magnet is improved.

Description

Technical field [0001] The invention relates to the field of magnetic material manufacturing, in particular to a method for preparing a manganese-bismuth permanent magnetic material with an electroplated layer. 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. Rare-earth permanent magnet materials are currently known to have the highest comprehensive performance. It has more than 100 times higher magnetic properties than the magnets used in the 90th century. It is much superior to ferrite and AlNiCo. The magnetic properties of expensive platinum-cobalt alloys are also twice as high. Because the use of rare earth permanent magnet materials not only promotes the miniaturization of permanent magnet devices, improves the performance of products, but also promotes the production of some special devices, so the emergence of rare earth perman...

Claims

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Application Information

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IPC IPC(8): H01F41/02H01F1/047C25D7/00C25D5/20C22C22/00
CPCH01F41/0253C22C22/00C25D5/20C25D7/001H01F1/047H01F41/026
Inventor 不公告发明人
Owner SUZHOU NANER MATERIAL TECH CO LTD