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A kind of preparation method of glass coating on the surface of NdFeB magnet

A technology of surface glass and NdFeB, applied in coating, metal material coating process, etc., can solve the problems of poor corrosion performance, easy aging, heat resistance, etc., and achieve high film/substrate bonding force and excellent wear resistance , Improve the effect of wear resistance

Active Publication Date: 2021-11-02
BEIKUANG MAGNETS FUYANG CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, glass coating has not been applied to improve the poor corrosion performance of sintered NdFeB permanent magnets at present. For this reason, the present invention proposes a method for preparing a glass coating on the surface of NdFeB magnets to solve the above-mentioned electroplated metal coating. It has a shielding effect on the magnetic properties of the magnet and the problems caused by the existing epoxy resin such as heat resistance, non-flame retardant, and easy aging

Method used

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  • A kind of preparation method of glass coating on the surface of NdFeB magnet

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Experimental program
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Effect test

Embodiment 1

[0025] A method for preparing a glass coating on the surface of an NdFeB magnet, comprising the following method steps:

[0026] (1) Primary tempering:

[0027] A block-shaped sintered NdFeB compact (provided by Anhui Dadixiong New Material Co., Ltd.) with a size of 42mm×20mm×10mm was used for the test.

[0028] Put the pressed NdFeB compact into the sintering furnace for primary tempering treatment. The process conditions for the primary tempering are: the degree of vacuum is 2×10 -2 Pa, the tempering temperature is 900°C, and the tempering treatment time is 3h to obtain NdFeB magnets.

[0029] (2) Magnet surface treatment:

[0030] Use 100-mesh brown corundum to blast the NdFeB magnet obtained in the first-stage tempering step to remove the scale on the surface of the magnet after the first-stage tempering. The blasting angle is 30°C, and the blasting time is 5 minutes.

[0031] (3) Preparation of glass glaze:

[0032] Weigh glass raw materials according to the following...

Embodiment 2

[0038] A method for preparing a glass coating on the surface of an NdFeB magnet, comprising the following method steps:

[0039](1) Primary tempering:

[0040] A block-shaped sintered NdFeB compact (provided by Anhui Dadixiong New Material Co., Ltd.) with a size of 42mm×20mm×10mm was used for the test.

[0041] Put the pressed NdFeB compact into the sintering furnace for primary tempering treatment. The process conditions for the primary tempering are: the degree of vacuum is 5×10 -2 Pa, the tempering temperature is 925°C, and the tempering treatment time is 4.5h to obtain NdFeB magnets.

[0042] (2) Magnet surface treatment:

[0043] Use 300-mesh brown corundum to blast the NdFeB magnet obtained in the first-stage tempering step to remove the scale on the surface of the magnet after the first-stage tempering.

[0044] (3) Preparation of glass glaze:

[0045] Weigh glass raw materials according to the following formula: 40% SiO 2 , 18% Bi 2 o 3 , 15% ZnO, 13% Al 2 o 3...

Embodiment 3

[0051] A method for preparing a glass coating on the surface of an NdFeB magnet, comprising the following method steps:

[0052] (1) Primary tempering:

[0053] A block-shaped sintered NdFeB compact (provided by Anhui Dadixiong New Material Co., Ltd.) with a size of 42mm×20mm×10mm was used for the test.

[0054] Put the pressed NdFeB compact into the sintering furnace for primary tempering treatment. The process conditions for the primary tempering are: the vacuum degree is 8×10 -2 Pa, the tempering temperature is 950°C, and the tempering treatment time is 6h to obtain NdFeB magnets.

[0055] (2) Magnet surface treatment:

[0056] Use 500-mesh brown corundum to blast the NdFeB magnet obtained in the first-stage tempering step to remove the scale on the surface of the magnet after the first-stage tempering.

[0057] (3) Preparation of glass glaze:

[0058] Weigh glass raw materials according to the following formula: 50% SiO 2 , 21% Bi 2 o 3 , 18% ZnO, 16% Al 2 o 3 , 1...

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Abstract

The invention discloses a method for preparing a glass coating on the surface of an NdFeB magnet. The iron-boron magnet is surface treated, the glass raw materials weighed in proportion are fully mixed and melted, the glass melt is annealed, and then the glass balls are ground into powder, and the glass glaze obtained in the glass glaze preparation step is used as cladding Material, using laser cladding technology to coat glass coating on the surface of the NdFeB magnet after surface treatment, and carry out secondary tempering treatment on the NdFeB magnet coated with glass coating; the present invention adopts laser cladding technology in the The glass coating prepared on the surface of sintered NdFeB magnets has the advantages of high strength, good ductility, thermal stability and chemical stability, as well as excellent wear resistance, heat resistance, corrosion resistance, acid and alkali corrosion resistance, etc. And it will not produce magnetic shielding effect on NdFeB magnets.

Description

technical field [0001] The invention relates to the field of surface protection of permanent magnet materials, in particular to a method for preparing a glass coating on the surface of an NdFeB magnet. Background technique [0002] Sintered NdFeB permanent magnet is a kind of rare earth permanent magnet material. Due to its excellent magnetic properties (high coercive force, high remanence, high energy product), it has been developed rapidly in recent years. It is widely used in modern industry, aerospace and national defense. It has been widely used in the military industry and is known as the "Magnetic King". However, the potential difference of each phase inside the sintered NdFeB magnet is quite different, and electrochemical corrosion is very easy to occur in a corrosive environment, which eventually leads to the powdering failure of the magnet. [0003] At present, the following two methods are mainly used to improve the poor corrosion performance of sintered NdFeB pe...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C23C24/10C23D5/00C03C8/04
CPCC03C8/04C04B41/0072C04B41/009C04B41/5022C04B41/68C04B30/00C04B41/4545C04B41/0036
Inventor 张鹏杰曹玉杰李炳山孙威刘辉刘荣明王永齐张威峰魏汉中谢光环周小文王倩王继全牛辉辉胡国辉周超董伟
Owner BEIKUANG MAGNETS FUYANG CO LTD