US 11,305,345 B2Granted

Method for preparing neodymium-iron-boron permanent magnetic material

AssigneesBaotou Research Institute of Rare Earths, National Engineering Research Centre of Ruike Rare Earth Metallurgy and Function Materials Co., Ltd., Baotou Iron & Steel (Group) Co., Ltd., Xiamen Institute of Rare Earth Materials, Baotou Jinshan Magnetic Material Co. Ltd

InventorsLiangcheng Sun, Zhanfeng Yang, Zhihong Zhang, Xiaoyu Liu, Shufeng Liu, Fan Yang, Jixiang Liu, Yu Wang, Jingya Li, Fei Lu, Shupu Lou, Hui Li, Peixin Chen, Yang Bai, Yu Cheng, Feng Wang, Tiancang Zheng, Feng Xia, Caina Sun

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Abstract

A method for preparing a NdFeB permanent magnetic material may include providing a covered NdFeB magnetic powder by depositing heavy rare earth particles or high-melting particles onto a NdFeB magnetic powder by physical vapor deposition; and performing orientation molding and sintering on the covered NdFeB magnetic powder to provide the NdFeB permanent magnetic material.

Claims1

Dependent claims

A method for preparing a NdFeB permanent magnetic material, the method comprising:

(1) carrying out ingredients-mixing, smelting, strip casting, hydrogen crushing, disproportionation reaction, and jet milling to obtain NdFeB fine powder with an average particle diameter D50 of 1 μm;
(2) placing the NdFeB fine powder and a CoZr thermal resistance wire respectively in a thermal resistance evaporation deposition device with a vacuum degree of 103 Pa;
setting parameters so as to uniformly disperse the NdFeB fine powder;
heating the CoZr thermal resistance wire to evaporate and deposit CoZr particles on the NdFeB fine powder;
taking out the covered NdFeB fine powder after its temperature is decreased to room temperature;
(3) performing orientation molding, sintering, and heat treatment on the covered NdFeB fine powder so as to obtain the NdFeB permanent magnetic material.

3 more elements

Dependencies are inferred from the claim text.

Facts

Application: 16/472,034Filed 21 Dec 2017
Priority: CN 201611191110.621 Dec 2016
Published: US 2020/0001360 A12 Jan 2020
Granted: 19 Apr 2022
Term ends: Not estimatedThe source records don’t support an estimate.

Classification20 codes

B22F 1/17
Metallic powder; Treatment of metallic powder, e.g. to facilitate working or to improve properties: metallic particles coated with metal
B22F 9/04
Using physical processes: starting from solid material, e.g. by crushing, grinding or milling
C23C 14/16
Metallic material, boron or silicon: on metallic substrates or on substrates of boron or silicon
C23C 14/165
On metallic substrates or on substrates of boron or silicon: by cathodic sputtering

Family

US 2020/0001360 A1Pre-grant publication · published 2 Jan 2020
US 11,305,345 B2This patent

From the US filing history. Foreign family members aren’t listed.

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