Fujian Changting Golden Dragon Rare-earth Co., Ltd

Fujian Golden Dragon Rare-earth Co., Ltd.

Xiamen Tungsten Co., Ltd.

Juhua Xie

Zongbo Liao

Yulin Lin

Hiroshi Nagata

Qin Lan

Jiaying Huang

Ying Luo

Dawei Shi

Hanshen Ye

Yanqing Long

Provided are a neodymium-iron-boron magnet material, raw material composition, preparation method, and application. The raw material composition of the neodymium-iron-boron magnet material comprises the following mass content components: R: 28-33%; R is a rare earth element, R comprises R1 and R2; R1 is a rare earth element added during smelting, and R1 comprises Nd and Dy; R2 is a rare earth element added during grain boundary diffusion, R2 comprises Tb, the content of R2 is 0.2%-1%; Co: <0.5%, but not 0; M: ≤0.4%, but not 0, and M is one or more of Bi, Sn, Zn, Ga, In, Au, and Pb; Cu: ≤0.15%, but not 0; B: 0.9-1.1%; Fe: 60-70%; the percentage is the mass percentage of the mass of each component to the total mass of the raw material composition. The neodymium-iron-boron magnet material has high remanence, coercivity, and good thermal stability.

Neodymium-iron-boron magnet material, raw material composition preparation method, and application

The present invention discloses a grain boundary diffusion method of an R&#x2014;Fe&#x2014;B series rare earth sintered magnet, an HRE diffusion source, and a preparation method thereof, comprising the following steps: engineering A of forming a dry layer on a high-temperature-resistant carrier, the dry layer being adhered with HRE compound powder, the HRE being at least one of Dy, Tb, Gd, or Ho; and engineering B of performing heat treatment on the R&#x2014;Fe&#x2014;B series rare earth sintered magnet and the high-temperature-resistant carrier treated with the engineering A in a vacuum or inert atmosphere and supplying HRE to a surface of the R&#x2014;Fe&#x2014;B series rare earth sintered magnet. The method can reduce the consumption of heavy rare earth element and control the loss of residual magnetism Br while increasing the coercivity.

Grain boundary diffusion method of R-Fe-B series rare earth sintered magnet

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Fujian, China

Juhua Xie