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NdFeB magnet formed by sintering NdFeB recycling waste and preparation method of NdFeB magnet

A technology for recycling waste and NdFeB, applied in the direction of magnetic objects, inorganic materials, magnetic materials, etc., can solve the problem of low utilization rate of NdFeB waste, difficult to meet high requirements, and poor performance of NdFeB magnets and other problems, to achieve the effect of improving the milling effect, good particle size concentration, and good temperature stability

Inactive Publication Date: 2015-04-29
NINGBO HONGLEI MAGNETICS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in this method, the mass percentage of the NdFeB magnet scrap in the mixture is usually below 50%, the utilization rate of the NdFeB scrap is not high, and the performance of the NdFeB magnet obtained is relatively poor, Difficult to meet demanding applications

Method used

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  • NdFeB magnet formed by sintering NdFeB recycling waste and preparation method of NdFeB magnet

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] A neodymium iron boron magnet sintered from neodymium iron boron recycling waste, said neodymium iron boron magnet is prepared by a sintering process through a mixture of neodymium iron boron recycling waste and neodymium iron boron compounding material, wherein The mass percentages of the NdFeB recycling waste and the NdFeB preparation are 20% and 80% respectively; the components and their mass percentages in the NdFeB recycling waste are: (PrNd) 26 Gd 3 Dy 0.1 Co 0.5 Al 0.8 Cu 0.1 B 0.98 Fe bal ; The components and their mass percentages in the NdFeB compound are: (PrNd) 29 Gd 4 Co 0.5 Al 0.8 Cu 0.1 B 0.98 Fe bal ;

[0028] The method for preparing the NdFeB magnet sintered from the NdFeB recycling waste in this embodiment includes the following steps:

[0029] Weigh the raw materials according to the ingredients and their mass percentages in the above-mentioned NdFeB formulations, and then smelt them in a vacuum quick-setting furnace with a vacuum of 0.5Pa at a smeltin...

Embodiment 2

[0035] A neodymium iron boron magnet sintered from neodymium iron boron recycling waste, said neodymium iron boron magnet is prepared by a sintering process through a mixture of neodymium iron boron recycling waste and neodymium iron boron compounding material, wherein The mass percentages of the NdFeB recycling waste and the NdFeB preparation are 30% and 70% respectively; the components and their mass percentages in the NdFeB recycling waste are: (PrNd) 26 Gd 3 Dy 0.1 Co 0.5 Al 0.8 Cu 0.1 B 0.98 Fe bal ; The components and their mass percentages in the NdFeB compound are: (PrNd) 29 Gd 3.5 Co 0.5 Al 0.8 Cu 0.1 B 0.98 Fe bal ;

[0036] The method for preparing the NdFeB magnet sintered from the NdFeB recycling waste in this embodiment includes the following steps:

[0037] Weigh the raw materials according to the ingredients and their mass percentages in the above-mentioned NdFeB compound, and then smelt them in a vacuum quick-setting furnace with a vacuum of 0.3Pa. The smelting ...

Embodiment 3

[0043] A neodymium iron boron magnet sintered from neodymium iron boron recycling waste, said neodymium iron boron magnet is prepared by a sintering process through a mixture of neodymium iron boron recycling waste and neodymium iron boron compounding material, wherein The mass percentages of the NdFeB recycling waste and the NdFeB preparation are 40% and 60% respectively; the components and their mass percentages in the NdFeB recycling waste are: (PrNd) 26 Gd 3 D y0.1 Co 0.5 Al 0.8 Cu 0.1 B 0.98 Fe bal ; The components and their mass percentages in the NdFeB compound are: (PrNd) 30 Gd 3 Co 0.5 Al 0.8 Cu 0.1 B 0.98 Fe bal ;

[0044] The method for preparing the NdFeB magnet sintered from the NdFeB recycling waste in this embodiment includes the following steps:

[0045] Weigh the raw materials according to the ingredients and their mass percentages in the above-mentioned NdFeB compound, and then smelt them in a vacuum quick-setting furnace with a vacuum of 0.8Pa, and the melting...

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Abstract

The invention relates to an NdFeB magnet formed by sintering NdFeB recycling waste and a preparation method of the NdFeB magnet, and belongs to the technical field of a rare earth magnetic material. The NdFeB magnet is formed by a mixed material formed by the recycling waste and a prepared material by a sintering technology, and the mass percentages of the recycling waste and the prepared material are respectively 2%-50% and 50%-98%; the recycling waste is RxMyBzFe(1-x-y-z) (x=29%-32%, y=0-4% and z=0.9%-1.1%), the prepared material is RxMyBzFe(1-x-y-z) (x=29%-35%, y=0-4% and z=0.9%-1.1%), R is one or more elements selected from La, Ce, Pr, Nd, Gd, Ho and Dy, and M is one of more elements selected form Co, Al, Cu, Nb, Zr and Ga. According to the NdFeB magnet and the preparation method, disclosed by the invention, the comprehensive utilization rate and the preparation efficiency of the recycling waste are increased, and the production cost is reduced.

Description

Technical field [0001] The invention relates to a neodymium iron boron magnet sintered from neodymium iron boron recycling waste and a preparation method thereof, belonging to the technical field of rare earth magnetic materials. technical background [0002] In recent years, with the rapid expansion of the application field of NdFeB magnets, the demand for raw materials has become larger and larger. However, due to the high cost of rare earth mining and the increase in national regulation and control, the material cost has gradually increased. Increase. In the current situation of excessive price increases, the downstream market’s price tolerance is relatively limited. Some downstream companies have chosen to use cheaper ferrites or materials such as alnico and samarium cobalt to replace the rare earth in the raw materials of neodymium iron boron magnets. This brings greater instability to the NdFeB magnet market. In addition, NdFeB magnet materials are highly brittle and have...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01F1/057H01F1/08B22F9/04B22F3/16
Inventor 张宏芳
Owner NINGBO HONGLEI MAGNETICS
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