Fujian Changting Golden Dragon Rare-earth Co., Ltd

Fujian Golden Dragon Rare-earth Co., Ltd.

Xiamen Tungsten Co., Ltd.

Yulin Lin

Zongbo Liao

Juhua Xie

Hiroshi Nagata

Qin Lan

Jiaying Huang

Ying Luo

Qingjiang Wang

Dawei Shi

Hanshen Ye

Changgeng Huang

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

Disclosed are a device and method for continuously performing grain boundary diffusion and heat treatment, characterized in that the alloy workpiece or the metal workpiece are arranged in a relatively independent processing box together with a diffusion source; the device comprises, in successive arrangement, a grain boundary diffusion chamber, a first cooling chamber, a heat treatment chamber, and a second cooling chamber, and a transfer system provided between various chambers for delivering the processing box; each of the first cooling chamber and the second cooling chamber uses an air cooling system, and the cooling air temperature of the first cooling chamber is above 25&#xb0; C. and at least differs by 550&#xb0; C. from the grain boundary diffusion temperature of the grain boundary diffusion chamber; the cooling air temperature of the second cooling chamber is above 25&#xb0; C. and at least differs by 300&#xb0; C. from the heat treatment temperature of the heat treatment chamber; and the cooling chamber has a pressure of 50 kPa to 100 kPa. The device provided by the present invention can increase the cooling rate and production efficiency, and improve product consistency.

Device and method for continuously performing grain boundary diffusion and heat treatment

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

Yulin Lin