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A kind of r-t-b series permanent magnet material and its preparation method and application

A technology of R-T-B and permanent magnet materials, which is applied in the direction of magnetic materials, inductance/transformer/magnet manufacturing, magnetic objects, etc., can solve the problem of coercive force drop, achieve the effect of improving squareness, overcoming the deterioration of magnet performance, and excellent performance

Active Publication Date: 2022-02-08
FUJIAN CHANGJIANG GOLDEN DRAGON RARE EARTH CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] The technical problem to be solved by the present invention is to overcome the defects in the prior art that the increase of remanence in R-T-B system sintered magnets will lead to the decrease of coercive force, and provide a kind of R-T-B system permanent magnet material and its preparation method and application

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  • A kind of r-t-b series permanent magnet material and its preparation method and application
  • A kind of r-t-b series permanent magnet material and its preparation method and application
  • A kind of r-t-b series permanent magnet material and its preparation method and application

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Embodiment 2

[0171] Embodiment 2, embodiment 3 and embodiment 6 spray coating TbF 3 , the rest of the examples and comparative examples spray coating DyF 3 .

[0172] (9) Heat treatment process: the sintered body was heat-treated at 500° C. for 3 hours in high-purity Ar gas, cooled to room temperature, and taken out.

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Abstract

The invention discloses an R-T-B permanent magnet material, a preparation method and an application thereof. The R-T-B permanent magnet material contains R, B, M, Fe, Co, X and unavoidable impurities, wherein: (1) R is a rare earth element, and the R contains at least Nd and RH; M is Ti One or more of , Zr and Nb; X includes Cu, "Al and / or Ga"; (2) by weight percentage: R: 30.5-32.0wt%; B: 0.95-0.99wt%; M: 0.3-0.6wt%; X: 0.8-1.8wt%, and Cu: 0.35-0.50wt%; the balance is Fe, Co and unavoidable impurities. The present invention obtains a permanent magnet material with excellent magnet performance and good squareness under the condition that the refractory metal content is 0.3-0.6wt%.

Description

technical field [0001] The invention relates to an R-T-B series permanent magnet material and its preparation method and application. Background technique [0002] For R-T-B sintered magnets, in order to increase the sintered density to increase the remanence (Br) of the magnet, it is usually used to increase the sintering temperature or prolong the sintering time. However, increasing the sintering temperature will easily lead to abnormal grain growth, thereby reducing the coercive force (Hcj) of the magnet. In JP-A No. 61-295355 and JP-A-2002-75717, it is disclosed that adding Ti, Zr, etc. to form boride elements, by causing the boride to precipitate at the grain boundary, suppresses the abnormal growth of grains, both It can avoid the reduction of coercive force and increase the sintered density. However, CN200480001869 also records the following content: Since the sintered magnet has a boride phase that does not have magnetic force, the main phase (R 2 T 14 B-type com...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01F1/057H01F41/02C22C38/14C22C38/12C22C38/16C22C38/06C22C38/10C22C33/02
CPCH01F1/0577H01F1/057H01F41/0253H01F41/0293C22C38/005C22C38/14C22C38/12C22C38/16C22C38/06C22C38/002C22C38/10C22C33/0278C22C2202/02B22F2998/10B22F2998/00B22F2999/00B22F2003/248B22F3/24C21D6/007B22F3/1017B22F3/1028B22F3/14B22F3/1039B22F2009/044B22F2201/20B22F2201/11
Inventor 蓝琴黄佳莹
Owner FUJIAN CHANGJIANG GOLDEN DRAGON RARE EARTH CO LTD