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Welding method for sintered NdFeB permanent magnets

A welding method and permanent magnet technology, applied in the direction of welding medium, welding equipment, welding/welding/cutting items, etc., can solve the problems of increasing irreversible loss, affecting magnetic structure or crystal structure, large internal stress, etc., to increase production process cost effect

Inactive Publication Date: 2015-11-18
CENT IRON & STEEL RES INST
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

If the magnet is magnetized and magnetized, if it is welded at a higher temperature, such as a fusion welding process, it will affect the magnetic structure or crystal structure of the material, increasing the irreversible loss, serious oxidation or melting will lead to the destruction of the two structures, and the loss of permanent magnetic properties.
[0007] (3) The NdFeB permanent magnet material is a brittle material. The traditional fusion welding will cause the material to generate large internal stress and rupture, and the permanent magnetic properties will also be lost.
[0008] Therefore, never see the report about sintered NdFeB permanent magnet welding technology in the prior art

Method used

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  • Welding method for sintered NdFeB permanent magnets
  • Welding method for sintered NdFeB permanent magnets
  • Welding method for sintered NdFeB permanent magnets

Examples

Experimental program
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Effect test

Embodiment 1

[0036] According to the N40SH grade, the material ratio is carried out, and then the "scale" is obtained by alloying smelting and quick-setting process. The alloy flakes are powdered by a jet mill, and then shaped under a magnetic field. The formed billet is sintered in a sintering furnace at a temperature of 1090°C to 1100°C to obtain a full-density blank.

[0037] (1) Cut and process the sintered N40SH magnet hair into 9×3×2.5 blocks, put rare earth-iron-copper-silicon brazing material between the two processed magnets and compact them;

[0038] (2) Then put it in a tempering furnace, and perform brazing and tempering heat treatment between 850°C / 5 hours and 500°C / 2 hours, 900°C / 3 hours and 520°C / 2 hours, and finally get welded into 18 ×6×5 N40SH-NdFeB sintered magnets.

[0039] The bending strength measurement of the welded magnet and the comparison data of the epoxy resin bonded magnet with the same size are listed in Table 2.

[0040] For further illustration, the resu...

Embodiment 2

[0047] According to the N50H grade, the material ratio is carried out, and then the "scale" is obtained by alloying smelting and quick-setting process. The alloy flakes are powdered by a jet mill, and then shaped under a magnetic field. The formed billet is sintered in a sintering furnace at a temperature of 1090°C to 1100°C to obtain a full-density blank.

[0048] (1) Cut and process the sintered N50H magnet into 9×3×2.5 blocks, put rare earth-iron-copper-silicon brazing material between the two processed magnets and compact them;

[0049] (2) Then put it in a tempering furnace, and perform brazing and tempering heat treatment between 850°C / 5 hours and 500°C / 2 hours, 900°C / 3 hours and 520°C / 2 hours, and finally obtain a welded 18 ×6×5 N50H-NdFeB sintered magnets.

[0050] The bending strength measurement of the welded magnet and the comparative data of the epoxy resin bonded magnet are listed in Table 4.

[0051] For further illustration, the results of the welding magneti...

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Abstract

The invention belongs to the technical field of rare-earth permanent magnet brazing, and particularly relates to a welding method for sintered NdFeB permanent magnets. The method is implemented in the manufacturing process of the sintered NdFeB permanent magnets and includes the following steps that 1, full-density blanks obtained after NdFeB sintering are machined to obtain a needed shape, and brazing filler is clamped between the welding end faces of two NdFeB blank machined parts needing to be welded and then is compressed; 2, the NdFeB blank machined parts with the brazing filler clamped are placed in a tempering furnace, and welding is completed while tempering treatment is performed. The method solves the problem that the NdFeB permanent magnets can not be welded, and can completely meet various welding requirements for performance, dimensions and shapes of the NdFeB permanent magnets. The welding process is also a process of improving the microstructure and coercivity of the NdFeB permanent magnets, subsequent magnetic performance of the magnets is not influenced, and production process cost increase caused by welding is avoided. The brazing bending strength of the magnets welded through the method is 8 times higher than that of magnets bonded through epoxy resin.

Description

technical field [0001] The invention belongs to the technical field of brazing of rare earth permanent magnets, in particular to a brazing method for sintering NdFeB and other rare earth iron-based permanent magnet materials. Background technique [0002] As a functional material, rare earth iron-based NdFeB permanent magnets are widely used in high-tech and emerging industries such as wind power generation, propulsion motors, and multi-pole magnets for micro-special motors. With the continuous improvement of market demand, the structural design in the above fields also needs to be updated. There is an urgent need for the corresponding advanced welding technology of NdFeB rare earth permanent magnets. Therefore, it is urgent to develop a brazing method for NdFeB rare earth permanent magnets. [0003] Due to the traditional welding process such as fusion welding, it is not weldable for NdFeB rare earth permanent magnet materials. At present, the connection and assembly of m...

Claims

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Application Information

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IPC IPC(8): B23K1/008B23K1/20B23K35/28B23K101/36
CPCB23K1/008B23K1/20B23K35/28B23K2101/36
Inventor 潘伟崔俊巍陈红生李岫梅
Owner CENT IRON & STEEL RES INST
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