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Sintered SmCo permanent magnet welding method

A welding method and permanent magnet technology, applied in the direction of welding medium, magnetic objects, welding equipment, etc., can solve the problems of increasing irreversible loss, affecting the magnetic structure or crystal structure, cracking, etc., and achieve the effect of increasing the cost of production process

Inactive Publication Date: 2015-11-25
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 SmCo permanent magnet material is a brittle material, and the traditional 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 SmCo permanent magnet welding technology in the prior art

Method used

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  • Sintered SmCo permanent magnet welding method
  • Sintered SmCo permanent magnet welding method
  • Sintered SmCo permanent magnet welding method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] According to the GYROS28 grade, the material ratio is carried out, and the alloy is powdered by ball milling in wet method or dry method in jet mill, and then formed under a magnetic field. After sintering the formed bad material in a sintering furnace at 1150°C to 1200°C, solid solution is carried out at 1050°C to 1080°C to obtain a full-density SmCo blank.

[0038] (1) Cut and process the sintered SmCo magnet hair into 9×3×2.5 blocks, put rare earth-cobalt-copper-silicon brazing material between the two processed magnets and compact them;

[0039] (2) Then put it in a heat treatment furnace, adopt 800-850°C / 3-24 hours isothermal aging, and 700°C / 1 hour+600°C / 1 hour+500°C / 1 hour+400°C / 3-10 hours classification Brazing and aging treatment are carried out within the aging temperature and time range, and finally a GYROS28SmCo sintered magnet welded into 18×6×5 is obtained.

[0040] The bending strength measurement of the welded magnet and the comparison data of the epoxy r...

Embodiment 2

[0048] According to the GYROS24 grade, the material ratio is carried out, and the alloy is powdered by ball milling in wet method or dry method in jet mill, and then formed under a magnetic field. After sintering the formed bad material in a sintering furnace at 1150°C to 1200°C, solid solution is carried out at 1050°C to 1080°C to obtain a full-density SmCo blank.

[0049] (1) Cut and process the sintered SmCo magnet into 9×3×2.5 blocks, put rare earth-cobalt-copper-silicon brazing material between the two processed magnets and compact them;

[0050] (2) Then put it in a heat treatment furnace, adopt 800-850°C / 3-24 hours isothermal aging, and 700°C / 1 hour+600°C / 1 hour+500°C / 1 hour+400°C / 3-10 hours classification Brazing and aging treatment are carried out within the aging temperature and time range, and finally a GYROS24-SmCo sintered magnet welded into 18×6×5 is obtained.

[0051] The bending strength measurement of the welded magnet and the comparative data of the epoxy re...

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Abstract

The invention belongs to the technical field of braze welding of a rare earth permanent magnet, and particularly relates to a sintered SmCo permanent magnet welding method. The method is carried out in the manufacturing procedure of a sintered SmCo permanent magnet and includes the following steps that (1) a total-density blank obtained after sintering and solid solution of SmCo is machined into the needed shape, and welding flux is clamped between two SmCo blank workpieces needing to be welded; and (2) the SmCo blank workpieces between which the welding flux is clamped are put into a heat treatment furnace, and the welding process is completed when isothermal aging and classification aging treatment are conducted. The problem that SmCo permanent magnets can not be welded is solved. Various welding requirements for performance, size and shape of the SmCo permanent magnets can be completely met. The welding process is also the process in which the micro structure of the magnets is changed and the coercivity is improved, the subsequence magnetic performance is not affected, and the production process cost caused by welding is not increased. The tensile strength of magnetic brazing welding carried out through the SmCo permanent magnet sintering welding method is 3.6 times higher than that of magnetic bonding carried out through epoxy resin.

Description

technical field [0001] The invention belongs to the technical field of rare earth permanent magnet brazing, in particular to a brazing method for sintering SmCo and other rare earth cobalt-based permanent magnet materials. Background technique [0002] As the most stable permanent magnet functional material, rare earth cobalt-based SmCo permanent magnets are widely used in high-tech fields such as high-precision instruments, microwave communications, navigation systems for aviation, spaceflight, and ships, and large propulsion 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 corresponding advanced welding technology for SmCo rare earth permanent magnets. Therefore, while developing the brazing material for SmCo rare earth permanent magnets, it is urgent to develop a brazing method for SmCo permanent magnets. [0003] Due to welding by traditional techniques such as fusi...

Claims

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Application Information

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IPC IPC(8): B23K1/008C22F1/16H01F41/02H01F1/053B23K35/30
CPCB23K1/008B23K35/3046C22F1/16H01F1/0536H01F41/0253
Inventor 潘伟方以坤郭朝辉
Owner CENT IRON & STEEL RES INST