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Heavy rare earth attachment process for sintered NdFeB permanent magnets produced by grain boundary diffusion method

A grain boundary diffusion, NdFeB technology, applied in solid diffusion coating, metal material coating process, magnetic objects, etc., can solve the problem that the consistency of product magnetic properties cannot be guaranteed, the magnetic properties are not up to standard, and the adhesion layer is partially peeled off, etc. problems, to achieve the effect of mass production and reasonable design

Active Publication Date: 2018-12-11
内蒙古北方众恒磁谷新材料有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Specifically, compared with the method of attaching heavy rare earth compounds or heavy rare earth simple substances, only small devices need to be added, the coating process is simple, and the cost is low, but there are two problems: one is that the adhesion layer will be partially peeled off , which eventually leads to deviations in the content of dysprosium or terbium required to achieve magnetic properties. Second, there are problems such as fluorine and oxygen elements that are harmful to magnets in the penetration process, which will lead to the expected magnetic properties not up to the standard or the consistency of the magnetic properties of the product. The high risk of protection; and the adhesion of heavy rare earth alloys or heavy rare earth elements does not have the problem of peeling off the adhesion layer and increasing harmful elements that affect magnetic properties, but it requires NdFeB manufacturers to invest more in new equipment, and the new process is relatively new. Complex production process and high cost

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  • Heavy rare earth attachment process for sintered NdFeB permanent magnets produced by grain boundary diffusion method
  • Heavy rare earth attachment process for sintered NdFeB permanent magnets produced by grain boundary diffusion method
  • Heavy rare earth attachment process for sintered NdFeB permanent magnets produced by grain boundary diffusion method

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Embodiment 1

[0026] A heavy rare earth attachment process for manufacturing sintered NdFeB permanent magnets by grain boundary diffusion method, the specific steps are as follows:

[0027] Put 30 kg of pure dysprosium into the hydrogen breaker for hydrogen absorption and crushing, then dehydrogenate, and then discharge the material under the protection of high-purity argon into a stainless steel powder collecting tank, seal it and transfer it to the jet mill process.

[0028] Put the hydrogen-crushed powder (coarse powder) into the jet mill under the protection of high-purity nitrogen, and carry out air-flow crushing under the protection of high-purity nitrogen into fine powder with an average particle size of D50=5.25μm. Put it into the powder collecting tank.

[0029] The dysprosium powder is discharged under the protection of high-purity nitrogen, divided into plastic bags, and then vacuum-packed for use.

[0030] The performance design value is 48M, and the NdFeB blank 51.5mm×26.5mm×3...

Embodiment 2

[0038] A heavy rare earth attachment process for manufacturing sintered NdFeB permanent magnets by grain boundary diffusion method, the specific steps are as follows:

[0039] Put 40 kg of pure metal terbium into the hydrogen breaker for hydrogen absorption and crushing, then dehydrogenate, and then discharge the material under the protection of high-purity argon into a stainless steel powder collecting tank, seal it, and transfer it to the jet mill process.

[0040] Put the hydrogen-crushed powder (coarse powder) into the jet mill under the protection of high-purity nitrogen, and carry out air-flow crushing under the protection of high-purity nitrogen into fine powder with an average particle size of D50=4.82μm. Put it into the powder collecting tank.

[0041] The terbium powder is discharged under the protection of high-purity nitrogen, divided into plastic bags, and then vacuum-packed for use.

[0042] The NdFeB permanent magnet blank 61.5mm×32.5mm×36.5mm with the performa...

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Abstract

The invention discloses a heavy rare earth attracting technology for manufacturing sintered nd-fe-b permanent magnet through a grain boundary diffusion method. An attraction tool is formed after one side face of a pure iron plate and a sintered nd-fe-b magnet are attracted, and the heavy rare earth simple substance powder of the specific amount is attracted to the two attracting end faces of a workpiece to be attracted in a press-fit mode through the attraction tool. According to the attracting technology, the magnetic performance of the product can be ensured, no more production or inspection devices need to be added, no complex flow or technological methods need to be added, a nd-fe-b production factory utilizes an existing device, on the basis of an existing operation method, the exquisite and simple tool is adopted, and large-batch production can be achieved.

Description

technical field [0001] The invention relates to the field of manufacturing technology of sintered NdFeB permanent magnets, in particular to a heavy rare earth attachment process for manufacturing sintered NdFeB permanent magnets by a grain boundary diffusion method. Background technique [0002] NdFeB permanent magnets are known as the "Magnetic King" due to their high coercive force and high magnetic energy product. Magnetic traction machines, variable frequency home appliance permanent magnet motors, digital audio-visual focusing motors, machine tool servo motors, drones and other fields are used to make permanent magnet motors, which can reduce energy consumption. However, with the advancement of industrial technology, various industries hope that the NdFeB permanent magnets used in permanent magnet motors will have higher magnetic properties. They must have extremely high magnetic energy products to reduce the size of the motor, and they must also have ultra-high coerciv...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01F1/057H01F41/02C23C10/30
CPCC23C10/30H01F1/0572H01F41/0293
Inventor 康振东郭敬东张宝权康振海
Owner 内蒙古北方众恒磁谷新材料有限公司