A coating material for infiltrating magnets and a preparation method for high coercive force NdFeB magnets

A high coercive force, coating material technology, applied in the direction of magnetic materials, inductance/transformer/magnet manufacturing, magnetic objects, etc., can solve the problem of poor consistency and uniformity of diffusion performance, high price of heavy rare earth elements, and utilization of diffusion materials Low-level problems, to achieve the effect of reducing the content of heavy rare earth elements, improving the coercive force of magnets, and good consistency

Active Publication Date: 2021-12-28
宁波金鸡强磁股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

But this method has the following problems: First, Dy(Tb) enters the main phase to form Dy(Tb) with low saturation magnetization. 2 Fe 14 Phase B, which in turn leads to a significant decrease in the magnetism of the magnet, and because most of Dy(Tb) enters the main phase, only a small part is distributed in the grain boundary, resulting in low utilization of Dy(Tb), and adding a large amount of Dy(Tb) will undoubtedly increase Product Cost
[0005] However, the current grain boundary diffusion method also has problems: 1. The utilization rate of the diffusion material is relatively low, but heavy rare earth elements are expensive and there is a lot of waste; 2. The consistency and uniformity of the diffusion performance is poor

Method used

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preparation example Construction

[0043] The RMH alloy powder preparation method preferably includes the following steps: smelting to obtain RM alloy ingots or slabs, hydrogen crushing without dehydrogenation treatment to obtain RMH alloys, and crushing the hydrogen crushed RMH alloys to obtain RMH alloy powders. The average particle size is 1-2 μm.

[0044] The hydrogen crushing process includes: placing RM alloy ingots or cast pieces in a hydrogen breaking furnace, feeding hydrogen gas so that the hydrogen pressure in the furnace is 0.01-1MPa, and crushing the hydrogen for a period of time to obtain RMH alloys. The length of the hydrogen absorption time is related to the RMH The content of H element in the alloy powder is related to the level, and the hydrogen absorption time can be controlled according to actual needs.

[0045] The crushing after hydrogen crushing can be a conventional crushing process, such as jet mill crushing. The jet mill pulverization is preferably carried out in an inert atmosphere o...

Embodiment 1

[0068] The coating material in this embodiment is made by mixing 94wt% Dy-Fe alloy powder and 6wt% Al powder. The average particle size of the Dy-Fe alloy powder is 2 μm, and the average particle size of the Al powder is 0.3 μm.

[0069] In the Dy-Fe alloy powder, the Fe content was 8 wt%.

Embodiment 2

[0071] The coating material in this embodiment is made by mixing 94wt% Dy-Fe-H alloy powder and 6wt% Al powder. The average particle size of the Dy-Fe-H alloy powder is 2 μm, and the average particle size of the Al powder is 0.3 μm.

[0072] In the Dy-Fe-H alloy powder, the Fe content is 8wt%, and the H element content is 0.8%.

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Abstract

The invention belongs to the field of rare earth permanent magnet materials, and relates to a coating material for permeable magnets and a preparation method for a high coercivity NdFeB magnet. The coating material includes: alloy powder A and low melting point metal powder B; the alloy powder A is R powder or RM alloy powder or RMH alloy powder; wherein R is Dy and / or Tb heavy rare earth element, and M is Fe , or Co, or an alloy composed of Fe and Co, H is hydrogen element; the low melting point metal powder B is one or both of Zn, Al, and Ga. The preparation method includes the following steps: making the coating material into a slurry, coating the slurry on the surface of a NdFeB substrate, undergoing two-stage diffusion heat treatment, and then tempering to obtain a high coercivity NdFeB substrate. magnet.

Description

technical field [0001] The invention belongs to the field of rare earth permanent magnet materials, and relates to a coating material for infiltrating magnets and a preparation method for high coercive force NdFeB magnets. Background technique [0002] Since the advent of sintered NdFeB in 1983, it has been widely used in IT, medical, home appliances, new energy vehicles and other fields due to its excellent magnetic properties, and is known as the "Magnetic King". With the development of the market, not only the sintered NdFeB magnets are required to have high magnetic properties but also high temperature resistance characteristics, so the magnets need to have higher coercive force. Therefore, improving the coercive force of the magnet while ensuring the magnetic properties of the magnet has become a hot spot in technology research and development. At present, most enterprises focus on adding heavy rare earth elements Dy(Tb) during smelting to improve the coercive force, s...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01F1/057H01F41/02C23C12/00
CPCH01F1/0577H01F41/0253H01F41/0293C23C12/00C22C28/00C22C1/03C22C2202/02B22F1/09B22F2998/10B22F3/24B22F7/008B22F3/1017B22F1/107C22C33/02B22F3/10B22F2003/242B22F2003/248C22C38/005C22C38/10H01F1/053H01F41/0246
Inventor 徐峰孟龙沈是茂胡元虎
Owner 宁波金鸡强磁股份有限公司
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