A kind of NdFeB magnet material, raw material composition, preparation method and application

A technology of NdFeB and magnets, which is applied in the manufacture of magnetic materials, magnetic objects, inductors/transformers/magnets, etc., can solve problems such as high cost, and achieve the effects of improving remanence Br, high density, and reducing the proportion

Active Publication Date: 2021-08-27
FUJIAN CHANGJIANG GOLDEN DRAGON RARE EARTH CO LTD
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Problems solved by technology

[0007] The present invention aims to overcome the need to add a large amount of cobalt or heavy rare earth elements to the NdFeB magnet material of the prior art to improve the magnetic properties (coercive force, remanence and thermal stability) of the NdFeB magnet material, but The defect of high cost, but provides a kind of NdFeB magnet material, raw material composition and preparation method and application

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  • A kind of NdFeB magnet material, raw material composition, preparation method and application
  • A kind of NdFeB magnet material, raw material composition, preparation method and application
  • A kind of NdFeB magnet material, raw material composition, preparation method and application

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preparation example Construction

[0150] 2, the preparation method of NdFeB magnet material in embodiment 1

[0151] (1) Smelting and casting process: according to the formula in table 1, the prepared addition R2 (R2 in the embodiment 4 and 8 is added in the form of PrCu, the content of Cu added in the grain boundary diffusion step in the embodiment 4 and 8 Respectively 0.05wt% and 0.03wt%, Cu is in the smelting step, the content that adds is respectively 0.03wt% and 0.12wt%) Raw materials other than put into the crucible of alumina, in the high-frequency vacuum smelting furnace with 0.05Pa Vacuum melting is carried out under the conditions of vacuum and 1500°C. Argon gas is introduced into the intermediate frequency vacuum induction quick-setting belt furnace for casting, and then the alloy is quenched to obtain alloy sheets.

[0152] (2) Hydrogen crushing process: Vacuumize the hydrogen crushing furnace where the quenched alloy is placed at room temperature, and then pass hydrogen gas with a purity of 99.9%...

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Abstract

The invention discloses a neodymium-iron-boron magnet material, a raw material composition, a preparation method and an application. The raw material composition of the NdFeB magnet material includes the following components in mass content: R: 28-33%; R is a rare earth element, R includes R1 and R2, R1 is a rare earth element added during smelting, and R1 includes Nd and Dy ; R2 is a rare earth element added during grain boundary diffusion, R2 includes Tb, and the content of R2 is 0.2 to 1%; M: ≤0.4%, but not 0, said M is Bi, Sn, Zn, Ga, In, One or more of Au and Pb; Cu: ≤0.15%, but not 0; B: 0.9-1.1%; Fe: 60-70%, and does not contain Co. The NdFeB magnet material of the present invention can still have high coercive force, remanence and good thermal stability under the condition of adding a small amount of heavy rare earth elements and not adding cobalt elements.

Description

technical field [0001] The invention specifically relates to a neodymium-iron-boron magnet material, a raw material composition, a preparation method and an application. Background technique [0002] Nd-Fe-B permanent magnet material with Nd 2 Fe l4 B compound as the matrix has the advantages of high magnetic properties, small thermal expansion coefficient, easy processing and low price. Since its inception, it has grown at an average annual rate of 20-30%, becoming the most widely used permanent magnet material. According to the preparation method, Nd-Fe-B permanent magnets can be divided into three types: sintering, bonding and hot pressing, among which sintered magnets account for more than 80% of the total output and are the most widely used. [0003] With the continuous optimization of preparation process and magnet composition, the maximum energy product of sintered Nd-Fe-B magnet is close to the theoretical value. With the vigorous development of emerging industrie...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01F1/057H01F41/00H01F41/02
CPCH01F1/0577H01F41/00H01F41/0253H01F41/0293H01F41/0266Y02E10/72C22C38/005
Inventor 骆溁廖宗博蓝琴黄佳莹师大伟林玉麟谢菊华龙严清
Owner FUJIAN CHANGJIANG GOLDEN DRAGON RARE EARTH CO LTD
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