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Method for improving grain boundary phase of neodymium iron boron

A grain boundary phase, neodymium iron boron technology, applied in the direction of magnetic objects, magnetic materials, inorganic materials, etc., can solve the problems of increased cost, uneven metal distribution, complex process, etc., to achieve enhanced coercive force and simplified doping process, the effect of cost reduction

Inactive Publication Date: 2015-12-02
ZHEJIANG DONGYANG DMEGC RARE EARTH MAGNET CO LTD
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  • Summary
  • Abstract
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  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This method needs to melt the alloy first and then crush it into nano-scale or micron-scale powder, thus increasing the production cost, and breaking the alloy ingot into powder requires a very complicated process or some advanced equipment
Or the two metals or their compounds are prepared into powders and then mixed into the magnet, but this way of mixing can easily lead to uneven distribution of the two mixed metals in the magnet

Method used

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  • Method for improving grain boundary phase of neodymium iron boron

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] Metal Sn is supported on Cu powder by cathode sputtering method (according to the mass ratio Sn:Cu=1:3), doped (Pr 0.25 Nd 0.75 ) 2.2 (Fe 14 Nb 0.2 al 0.3 ) In the B magnet, the particle size after mixing is about 12 microns, and the doping amount is 0.3%wt. The final performance of the magnet is: Br=13.8Gs, Hcj=15.7kOe, (BH) max = 45.7 MOeGs.

Embodiment 2

[0036] Mix metal Sn (melting point is about 231.9°C) and copper powder (melting point is about 1083.4°C) and heat to 400°C, Sn is melted and mixed with copper powder evenly, then use spray technology (gas atomization method) to prepare Sn / Cu Composite alloy powder, its particle size is about 22 microns (by mass ratio Sn: Cu=1: 1), doped with (Pr 0.25 Nd 0.75 ) 2.2 (Fe 14 Nb 0.2 al 0.3 ) In the B magnet, the doping amount is 0.5%wt. The final performance of the magnet is: Br=13.6Gs, Hcj=16.2kOe, (BH) max = 44.7 MOeGs. .

Embodiment 3

[0038] Metal magnesium (boiling point: about 1090°C) is heated by vacuum evaporation on copper powder (melting point: about 1083.4°C) and evaporated onto copper powder to prepare Mg / Cu composite alloy powder with a particle size of about 16 Micron (according to the mass ratio Mg: Cu = 1: 3), doped (Pr 0.25 Nd 0.75 ) 2.2 (Fe 14 Nb 0.2 al 0.3 ) In the B magnet, the doping amount is 0.2%wt. The final performance of the magnet is: Br=13.8Gs, Hcj=16.4kOe, (BH) max = 45.9 MOeGs.

[0039] Through comparative examples, Example 1, Example 2 and Example 3, by loading one metal or compound on the powder of another metal or compound, it is made into a fully wrapped, or partially wrapped, or adhered Type composite mixed alloy powder, and then mixed into the main phase alloy powder by the mixed alloy method, also achieve the effect of doping two or more metal elements in the grain boundary, effectively improving the performance of the magnet.

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Abstract

The invention discloses a method for improving grain boundary phase of neodymium iron boron. The method comprises 1. preparing main phase alloy powder through a conventional method; 2. preparing mixed alloy powder through mining metal or compound M1 onto powder of other metal or compound M; 3. doping the mixed alloy powder into the main phase alloy powder through blending additions; and 4. sintering formed and pressed mixed powder, and annealing sintered samples twice to obtain a neodymium iron boron magnet body. By adopting the method, an effect generated through doping two or more kinds of metal elements in the grain boundary can be achieved, a dopant can comparatively uniformly distribute in a grain boundary phase, very complex technology or some high-grade equipment are needless, the manufacturing cost can be reduced, a doping process can be simplified, and the coercive force of the magnet body can be effectively raised.

Description

technical field [0001] The invention relates to the related technical field of sintered NdFeB magnets, in particular to a method for improving the grain boundary phase of NdFeB magnets. Background technique [0002] Sintered NdFeB magnets have very superior magnetic properties, and they have very high coercive force, remanence and magnetic energy product in a normal temperature environment, so they are known as the third generation "magnet king" and are widely used in automotive motors , wind power systems and other high-end products. The remanence of the currently prepared NdFeB magnets can reach more than 90% of the theoretical value, but its coercive force is less than 1 / 3 of the theoretical value without adding heavy rare earth elements. Therefore, how to improve the coercive force of NdFeB magnets is also the focus of current research. [0003] In order to improve the intrinsic coercive force of sintered NdFeB magnets, the commonly used methods are: grain refinement, ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01F41/02H01F1/057H01F1/08B22F1/02B22F1/00
Inventor 王成胜
Owner ZHEJIANG DONGYANG DMEGC RARE EARTH MAGNET CO LTD
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