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R-T-B series permanent magnet material and preparation method and application thereof

A technology of R-T-B and permanent magnet materials, which is applied in the fields of magnetic materials, inductance/transformer/magnet manufacturing, magnetic objects, etc., and can solve the problems of over-dependence on the performance improvement of sintered NdFeB magnets, etc.

Active Publication Date: 2020-02-28
FUJIAN CHANGJIANG GOLDEN DRAGON RARE EARTH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The technical problem to be solved by the present invention is to overcome the defect that the performance improvement of sintered NdFeB magnets in the prior art is excessively dependent on heavy rare earth elements, and to provide an R-T-B permanent magnet material and its preparation method and application

Method used

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  • R-T-B series permanent magnet material and preparation method and application thereof
  • R-T-B series permanent magnet material and preparation method and application thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0165] The preparation method of R-T-B series sintered magnet is as follows:

[0166] (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 melting is carried out at a temperature below 1500°C in a vacuum of Pa.

[0167] (2) Casting process: after vacuum smelting, Ar gas is passed into the smelting furnace to make the air pressure reach 55,000 Pa, and then casting is carried out at 10 2 ℃ / sec-10 4 °C / sec cooling rate to obtain quenched alloy.

[0168] (3) 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% into the hydrogen crushing furnace to maintain the hydrogen pressure at 0.15 MPa. After fully absorbing hydrogen, Heat up while evacuating to fully dehydrogenate, then cool, and take ...

Embodiment 2- Embodiment 59

[0175] The raw materials were prepared according to the formula shown in Table 1, and the other process conditions were the same as in Example 1 to obtain the R-T-B series sintered magnet.

Embodiment 60

[0177] The sintered body obtained in Example 55 was first subjected to grain boundary diffusion treatment, and then to aging treatment. Wherein, the aging treatment process is the same as in Example 1, and the grain boundary diffusion treatment process is as follows:

[0178] Process the sintered body into a magnet with a diameter of 20mm and a sheet thickness of less than 3mm. The direction of thickness is the orientation direction of the magnetic field. The magnet is dried, and in a high-purity Ar gas atmosphere, the metal with Tb element is sputtered on the surface of the magnet, and the temperature of 850°C is diffused and heat-treated for 24 hours. Cool to room temperature.

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Abstract

The invention discloses an R-T-B series permanent magnet material and a preparation method and application thereof. The R-T-B series permanent magnet material comprises components of 29.5-33.0 wt.% ofR', N, B and Te, wherein the R' comprises R, Pr, Nd, the R is a rare earth element except Pr and Nd, the content of Pr is greater than or equal to 8.85 wt.%, a mass ratio of Nd to R' is less than 0.5, the N is greater than 0.05 wt.% and is not greater than 4.1 wt.%, the N is Ti, Zr or Nb, the B is 0.90-1.2wt.%, and the Fe is 62.0-68.0wt.%. The R-T-B series permanent magnet material is advantagedin that a sintered permanent magnet product with high coercive force and a stable temperature coefficient is prepared by adopting a formula with high Pr content, advantages of Pr can be exerted to themaximum extent by adopting the formula disclosed by the invention, and production cost is effectively reduced.

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] Nd was discovered by Soviet scientists in 1979 2 Fe 14 Since B, researchers in the United States and Japan have taken the lead in studying the properties of this phase. At present, the phase composed of PrNd (the mass ratio of Pr and Nd is 20:80 or 25:75) has been used in commercial sintering. The production of magnets, due to its advantages of high magnetic energy product and high remanence, has been used in motors, electro-acoustic devices, computer hard disk drives (HDD), military equipment, human magnetic resonance imaging (MRI), microwave communication technology, control It has been widely used in devices, instruments and so on. [0003] With the advancement of science and technology, higher requirements are put forward for the performance of Nd-Fe-B. Many researchers have improved the performance of Nd-F...

Claims

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Application Information

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IPC IPC(8): H01F1/057H01F41/02
CPCH01F1/0577H01F41/0253H01F41/0266C22C38/008C22C38/16C22C38/12C22C38/14C22C38/002H01F1/0573H01F41/0293C22C38/005C22C2202/02C22C38/06C22C38/10C22C38/32
Inventor 付刚黄佳莹黄吉祥权其琛
Owner FUJIAN CHANGJIANG GOLDEN DRAGON RARE EARTH CO LTD
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