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Preparation method of samarium-cobalt permanent magnet with ceramic layer

A permanent magnet and ceramic layer technology, which is applied in the field of preparation of samarium cobalt permanent magnets, can solve the problems affecting the performance and life of the magnet, peeling, large potential difference, etc., and achieve the effect of high-quality protection and firm connection

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

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 samarium-cobalt permanent magnet material matrix of the present embodiment is by following composition by general formula: Sm(Co 0.97 Ni 0.03 ) 4.8 Si 0.2 .

[0022] 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.

[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 of the quartz...

Embodiment 2

[0029] The samarium-cobalt permanent magnet material matrix of the present embodiment is by following composition by general formula: Sm(Co 0.9 Ni 0.1 ) 4.5 Si 0.5 .

[0030] 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.

[0031] The obtained alloy ingot is crushed, 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 vacuuming the cavity of the vacuum strip machine, 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 to the s...

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Abstract

The invention discloses a preparation method of a samarium-cobalt permanent magnet with a ceramic layer. Doping is adopted for adjusting the components of SmCo5 alloy to obtain a high alloy componentsupercooling degree, and in cooperation with a high-speed quick-quenching technology, anisotropic SmCo5 with small particle size is obtained. According to the preparation method, it can be guaranteedthat the connection between a permanent magnet substrate and an Al2O3-NiO composite ceramic coating is firm, bubbles and dropping do not easily occur to the Al2O3-NiO composite ceramic coating, a plasma spraying technology is adopted for preparing the Al2O3-NiO composite ceramic coating, and accordingly high-quality protection of the surface of the magnet can be achieved.

Description

technical field [0001] The invention relates to the field of magnetic material manufacture, in particular to a preparation method of a samarium cobalt permanent magnet with a ceramic 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 devices. Therefore...

Claims

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Application Information

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IPC IPC(8): H01F41/02H01F1/058
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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