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Biphase dehydrogenation technique of neodymium iron boron

A process method, NdFeB technology, applied in the field of NdFeB dual-phase dehydrogenation process, can solve the problems of incomplete dehydrogenation, achieve the effects of reducing stress channels, reducing stress channels, and reducing hydrogen outgassing

Inactive Publication Date: 2013-01-23
山西京宇天成科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, the industry mainly adopts the dehydrogenation process of the neodymium-rich phase, so the dehydrogenation is not complete

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0008] A NdFeB two-phase dehydrogenation process method, a NdFeB two-phase dehydrogenation process method, is to rotate and heat the hydrogen breaking furnace body at a speed of 3 seconds per circle to 360 ° C, and heat it for 2 hours Dehydrogenation, this process is mainly the dehydrogenation of the main phase. When the pressure in the hydrogen furnace is less than 80 pa, the dehydrogenation of the main phase is completed, continue to heat up to 590°C, and keep warm for 3 hours for dehydrogenation. This process is mainly neodymium-rich Phase dehydrogenation, when the pressure in the hydrogen furnace is less than 80pa, the neodymium-rich phase dehydrogenation ends, that is, the heating cover is opened, the hydrogen furnace is cooled, and the material is discharged. It is pumped away to achieve the purpose of heating and dehydrogenation. The advantage of this is that the dehydrogenation is more thorough, the amount of outgassing in the subsequent sintering process is reduced, an...

Embodiment 2

[0010] A NdFeB dual-phase dehydrogenation process method is to rotate and heat the hydrogen breaking furnace body at a speed of 2 seconds / circle to 260 ° C, and heat it for 3 hours for heating and dehydrogenation. This process is mainly the main phase dehydrogenation. When the pressure in the hydrogen furnace is less than 80 pa, the dehydrogenation of the main phase is completed, continue to heat up to 560°C, and keep warm for 4 hours for dehydrogenation. This process is mainly dehydrogenation of the neodymium-rich phase. When the pressure in the hydrogen furnace is less than 80pa At this time, the dehydrogenation of the neodymium-rich phase is completed, that is, the heating mantle is opened, the hydrogen is broken into the furnace to cool, and the material is discharged, and the released hydrogen is sucked away by the mechanical pump connected to the furnace body and the Roots pump to achieve the purpose of heating and dehydrogenation. The advantage is that the dehydrogenatio...

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Abstract

The invention relates to a biphase dehydrogenation technique of neodymium iron boron. According to the method, an insulation dehydrogenation section is directly arranged at 260-360 DEG C prior to dehydrogenation of rich neodymium phase; firstly, dehydrogenation is carried out on the main phase; and then, regular dehydrogenation of rich neodymium phase is carried out at 560-590 DEG C. The advantage is that the dehydrogenation is more complete, the discharge amount in the subsequent sintering process is reduced, and the stress passage of magnets is reduced, so that the toughness and bending strength of the neodymium iron boron product are improved.

Description

technical field [0001] The invention relates to a NdFeB hydrogen dehydrogenation process, in particular to a NdFeB two-phase dehydrogenation process. Background technique [0002] The dehydrogenation process of the existing NdFeB hydrogen breaking process is mainly to close the heating cover after the hydrogen breaking furnace absorbs hydrogen, and heat the hydrogen breaking furnace body to 560°C-590°C to make the NdFeB in the furnace The hydrogen-breaking powder is used to dehydrogenate the neodymium-rich phase, thereby reducing the emission of hydrogen during the subsequent sintering process and reducing the stress channel of the product due to exhaust. But in fact, NdFeB hydrogen absorption is mainly divided into two processes: main phase hydrogen absorption and neodymium-rich phase hydrogen absorption, and dehydrogenation also corresponds to two processes of main phase dehydrogenation and neodymium-rich phase dehydrogenation. At present, the industry mainly adopts the ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C21D3/06
Inventor 马跃华贾建伟崔学军范正为贾建华
Owner 山西京宇天成科技有限公司