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Neodymium-iron-boron magnet and preparation method and application thereof

A technology of NdFeB and magnets, which is applied in the direction of magnetic objects, inductors/transformers/magnets, magnetic materials, etc., can solve the problems of uneven internal structure of magnets, high mass production costs, and limited improvement in demagnetization resistance. Improve the utilization rate and production efficiency, improve the high temperature demagnetization resistance, and suppress the reduction of the magnetic flux of the magnet

Active Publication Date: 2020-09-11
YANTAI ZHENGHAI MAGNETIC MATERIAL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, if the diffusion material is coated on the four surfaces of the magnet parallel to the magnetization direction, the internal structure of the magnet is uneven and the problem of poor squareness is still unsolved. Although the demagnetization resistance has been improved, the improvement is limited.
Coating four surfaces parallel to the magnetization direction, when using the dipping method, it is necessary to isolate two opposite surfaces perpendicular to the magnetization direction, and the diffusion material will be unevenly distributed on the surface of the magnet due to gravity; using magnetron sputtering requires Only by multiple treatments can all four surfaces be attached with diffusion materials, the production efficiency is low and the cost of mass production is high

Method used

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  • Neodymium-iron-boron magnet and preparation method and application thereof
  • Neodymium-iron-boron magnet and preparation method and application thereof
  • Neodymium-iron-boron magnet and preparation method and application thereof

Examples

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Effect test

Embodiment 1

[0064] To prepare R1-Fe-M-B based magnets, prepare raw material alloys according to the following composition ratio, wherein, R1 is Nd, the content is 30.5wt%; Co content is 1.5wt%; M is Al, Cu and Ga, the content is 0.1wt% %, 0.1wt% and 0.15wt%; B content is 0.95%, the balance is Fe and unavoidable impurities, such as C, N, etc. The specific preparation process of NdFeB magnets is as follows:

[0065] a) Melting: Using a vacuum induction melting furnace, put the above-mentioned prepared raw materials into the crucible, heat to 1480 ° C, the raw materials are melted into molten steel, and pour the fully dissolved molten steel onto the quenching roller, rapidly cool down, and place on the surface of the roller Nucleate, crystallize, and gradually grow up to form alloy scales.

[0066] b) Milling: the obtained alloy scales are subjected to HD crushing treatment, and then subjected to jet mill grinding to obtain jet mill powder with an average particle size SMD of 3.0 μm.

[00...

Embodiment 2

[0077] To prepare a R1-Fe-M-B based magnet, the raw material alloy is prepared according to the following composition ratio, wherein, R1 is Nd, the content is 31wt%; the Dy content is 0.5wt%, and the Co content is 2.0wt%; M is Al, Cu and Ga, The contents are 0.15wt%, 0.15wt% and 0.1wt%, respectively; the B content is 0.98%, and the balance is Fe and unavoidable impurities such as C and N. The specific preparation process of NdFeB magnets is as follows:

[0078] a) Melting: Using a vacuum induction melting furnace, put the above-mentioned prepared raw materials into the crucible, heat to 1460 ° C, the raw materials are melted into molten steel, pour the fully dissolved molten steel onto the quenching roller, rapidly cool down, and place on the surface of the roller Nucleate, crystallize, and gradually grow up to form alloy scales.

[0079] b) Milling: the obtained alloy flakes are subjected to HD crushing treatment, and then subjected to jet mill grinding to obtain jet mill po...

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Abstract

The invention provides a neodymium-iron-boron magnet and a preparation method and application thereof. The neodymium-iron-boron magnet is represented by a chemical formula R1-R2-Fe-M-B, and the neodymium-iron-boron magnet has a composite structure of a high-coercivity region and a high-remanence region, wherein R1 is a rare earth element at least containing Nd, R2 is a heavy rare earth element atleast containing Dy and / or Tb, and M is a transition metal element at least containing Co. The magnet can adopt a small amount of Dy / Tb, the high-temperature demagnetization resistance of the magnet is greatly improved, the reduction of the magnetic flux of the magnet is inhibited, and the magnet is suitable for an embedded high-speed motor. The method for preparing the magnet can also greatly improve the utilization rate and the production efficiency of the material, and has mass production feasibility.

Description

technical field [0001] The invention belongs to the field of neodymium-iron-boron magnets, and in particular relates to a neodymium-iron-boron magnet and its preparation method and application. Background technique [0002] Sintered NdFeB magnets, as the fourth generation of permanent magnet materials, are known as the "Magnetic King" for their excellent magnetic properties, and are widely used in many fields such as automobiles, wind power, compressors, elevators, and industrial automation. [0003] When the high-speed motor is running, the sintered NdFeB magnet in the motor is exposed to high temperature environment due to the heat generated by the winding and iron core, and thermal demagnetization is prone to occur due to the effect of the magnetic field in the opposite direction from the winding. This requires NdFeB magnets for high-speed motors to have a certain coercive force to provide sufficient heat resistance and demagnetization capability to ensure that the magnet...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01F1/057H01F41/02C22C38/10C22C38/16C22C38/14C22C38/06C22C38/04C22C38/12C23C14/24C23C14/35C23C14/16
CPCH01F1/0576H01F1/0577H01F41/0253H01F41/0266H01F41/0293C22C38/005C22C38/002C22C38/10C22C38/16C22C38/14C22C38/06C22C38/04C22C38/12C23C14/24C23C14/35C23C14/16C23C14/165H01F1/057H01F7/021H01F38/00
Inventor 史丙强刘磊马丹宿云婷
Owner YANTAI ZHENGHAI MAGNETIC MATERIAL CO LTD
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