Unlock instant, AI-driven research and patent intelligence for your innovation.

Method for preparing neodymium iron boron surface glass coating

A surface glass and NdFeB technology, which is applied in the field of preparation of NdFeB magnet surface glass coating, can solve the problems of heat resistance, poor corrosion performance, non-flame retardancy, etc., and achieve excellent wear resistance, high film/substrate Bonding force, improve the effect of wear resistance

Active Publication Date: 2019-11-08
BEIKUANG MAGNETS FUYANG CO LTD
View PDF6 Cites 3 Cited by
  • 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

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Method for preparing neodymium iron boron surface glass coating

Examples

Experimental program
Comparison scheme
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...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

No PUM Login to View More

Abstract

The invention discloses a method for preparing a neodymium iron boron surface glass coating. The method comprises the following steps: performing primary tempering treatment on a neodymium iron boronpress blank after pressing molding; performing surface treatment on the neodymium iron boron magnet obtained after the primary tempering treatment; sufficiently mixing weighed glass raw materials according to a ratio; performing melting, performing annealing treatment on a glass melt, and performing ball milling on glass so as to obtain powder; by taking a glass glaze obtained in a glass glaze preparation step as a melt material, smearing a glass coating on the surface of the neodymium iron boron magnet after surface treatment by using a laser cladding technique; and performing secondary tempering treatment on the neodymium iron boron magnet coated by the glass coating. By adopting the laser cladding technique, the glass coating prepared on the surface of the neodymium iron boron magnet has the advantages of being high in strength, good in ductility, thermal stability and chemical stability, and the like, in addition has excellent properties of wearing resistance, thermal resistance, corrosion resistance, acid-alkali corrosion resistance and the like, and has no magnetic shielding function on the ductility magnet.

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

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
Patent Type & Authority Applications(China)
IPC IPC(8): C04B41/68C03C8/04C04B41/00
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