Preparation method of manganese-bismuth permanent magnet with ceramic protection layer

A protective layer and permanent magnet technology, applied in the direction of magnetic objects, coatings, magnetic materials, etc., can solve the problems of battery intergranular corrosion, peeling, affecting magnet performance and life, etc., to achieve stable permanent magnetic performance, firm connection, high The effect of quality protection

Inactive Publication Date: 2018-11-23
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

The structure is loose and porous, and the potential difference between the phases is large. It is easy to form a primary battery in a warm environment and cause serious intergranular corrosion, which seriously affects the performance and life of the magnet.
At present, the most common magnet surface protection technologies are electroplating and electroless plating. However, electroplating and electroless plating are used to prepare a protective layer on the surface of the magnet substrate. The surface conditioning treatment and plating process will cause liquid substances to enter the substrate, so that in the later Bubbles, peeling and other failure phenomena occur inside the protective layer during use

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] The chemical formula of the composition of the permanent magnet material matrix in this embodiment is Mn 57 Bi 42 co 1 .

[0022] Weigh each element according to the chemical formula of the above ingredients for batching; put the batching in the smelting furnace, and vacuumize the furnace to 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.

[0023] 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 from the nozzle at the bottom end of the quartz tube to the surface of the copper ro...

Embodiment 2

[0028] The chemical formula of the composition of the permanent magnet material matrix in this embodiment is Mn 52 Bi 45 co 3 .

[0029] Weigh each element according to the chemical formula of the above ingredients for batching; put the batching in the smelting furnace, and vacuumize the furnace to 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.

[0030] 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 of the quartz tube to the surface of the copper roller to be 1-5m...

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PUM

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Abstract

The invention discloses a preparation method of a manganese-bismuth permanent magnet with a ceramic protection layer. The permanent magnet material prepared by the method has excellent performance andstable permanent magnet performance and can be obtained through a simple and feasible preparation method; according to the method, the connection firmness between a magnet matrix and an Al2O3-NiO composite ceramic layer can be ensured; bubble forming and falling off of the Al2O3-NiO composite ceramic layer do not occur easily; and meanwhile, the Al2O3-NiO composite ceramic layer is prepared by adopting a plasma spraying technology, so that high-quality protection on the surface of the magnet can be realized.

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 magnet with a ceramic protection layer. 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 devi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01F1/059H01F41/32C22C12/00C23C4/134C23C4/11
CPCH01F1/059C22C12/00C23C4/11C23C4/134H01F41/32
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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