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

A technology of R-T-B and permanent magnet materials, applied in magnetic materials, inductor/transformer/magnet manufacturing, magnetic objects, etc., can solve problems such as poor magnet performance, achieve excellent magnetic performance, good temperature stability of magnets, and consistent magnet performance Good results

Active Publication Date: 2022-04-05
FUJIAN CHANGTING GOLDEN DRAGON RARE EARTH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The technical problem to be solved by the present invention is to overcome the defect of poor magnet performance when B<5.88at% in the prior art, and provide a R-T-B permanent magnet material and its preparation method and application

Method used

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

Examples

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Effect test

Embodiment 1～20 and comparative example 1～7

[0281] The raw materials used for preparing the R-T-B series permanent magnet material in Examples 1-20 and Comparative Examples 1-7 are as shown in Table 1, and the technology for its preparation is as follows:

[0282] (1) Melting process: according to the formula shown in Table 1, take the prepared raw materials and put them into a crucible made of alumina, and put them in a high-frequency vacuum induction melting furnace at 5×10 -2 Vacuum smelting at a temperature below 1500°C in a vacuum of Pa to obtain a melt.

[0283] (2) Casting process: Ar gas is introduced into the smelting furnace after vacuum smelting to make the air pressure reach 55,000 Pa, and then the casting is carried out, and the molten liquid is passed through a copper roller with a speed of 29 rpm to obtain a speed of 0.12-0.35mm thickness. Condensed gold sheet, during the casting process, the copper roller needs to be fed with chilled water, and the temperature of the water inlet is ≤25°C.

[0284] (3) H...

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Abstract

The invention discloses an R-T-B permanent magnet material, a preparation method and an application thereof. The raw material composition of the R-T-B permanent magnet material includes the following components in mass content: R: 28.5-33.0%; Ga: >0.5%; Cu: ≥0.4%; B: 0.84-0.94%; Al: 0.05-0.07%; Co: ≤2.5% but not 0; Fe: 60-70%; N: one or more of Ti, Zr and Nb; when N contains Ti, the content of Ti is 0.15 ~0.25%; when N includes Zr, the content of Zr is 0.2~0.35%; when N includes Nb, the content of Nb is 0.2~0.5%; the percentage is the mass of each component in the total mass of the raw material composition mass percentage. The R-T-B permanent magnet material of the present invention has better magnetic properties, and the same batch of products has uniform magnetic properties.

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] R-T-B series sintered magnets (R refers to rare earth elements, T refers to transition metal elements and the third main group metal elements, B refers to boron elements) are widely used in electronic products, automobiles, wind power, home appliances, elevators and Industrial robots and other fields, such as hard disks, mobile phones, earphones, and permanent magnet motors such as elevator traction machines and generators, are used as energy sources. requirements are gradually increasing. [0003] In order to increase the remanence of R-T-B sintered magnets, it is usually necessary to reduce the B content. But when the content of B is at a lower level, R will be formed 2 T 17 Mutually. while R 2 T 17 There is no uniaxial anisotropy at room temperature, which degrades the performance of the magnet. [0004...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01F1/057H01F41/02
CPCH01F1/0577H01F41/0266
Inventor 付刚黄吉祥黄佳莹陈大崑黄清芳
Owner FUJIAN CHANGTING GOLDEN DRAGON RARE EARTH CO LTD