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Rare earth permanent magnet material, raw material composition, preparation method, application and motor

A technology of raw material composition and permanent magnet material, which can be used in the manufacture of magnetic materials, magnetic objects, inductors/transformers/magnets, etc., which can solve the problems of Br and Hcj being difficult to achieve synchronous promotion.

Active Publication Date: 2019-12-13
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

[0006] The technical problem to be solved by the present invention is to overcome the defect that Br and Hcj of R-T-B series rare earth permanent magnet materials are difficult to achieve synchronous improvement in the prior art, and provide a rare earth permanent magnet material, raw material composition, preparation method, application, motor

Method used

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  • Rare earth permanent magnet material, raw material composition, preparation method, application and motor
  • Rare earth permanent magnet material, raw material composition, preparation method, application and motor
  • Rare earth permanent magnet material, raw material composition, preparation method, application and motor

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0143] The preparation method of R-T-B series sintered magnet is as follows:

[0144] (1) Melting process: according to the formula shown in Example 1 in Table 1, get 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.

[0145] (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.

[0146] (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 c...

Embodiment 2-8、 comparative example 1-9

[0157] According to the formula shown in Table 1, the R-T-B series sintered magnets corresponding to Examples 2-8 and Comparative Examples 1-9 were obtained, wherein the preparation techniques of Examples 2-4, Comparative Examples 1-3 and Comparative Examples 6-9 were the same as Example 1.

[0158] The preparation processes of Examples 5-8 and Comparative Examples 4-5 are the same as Example 1 except for the following differences: grain boundary diffusion treatment process: the sintered body is processed into a magnet with a diameter of 20mm and a thickness of 5mm, and the thickness direction is the orientation direction of the magnetic field. After the surface is cleaned, the diffusion material containing Tb metal is sprayed and coated on the magnet, and the coated magnet is dried. In a high-purity Ar gas atmosphere, the magnet with Tb element attached to the surface is Diffusion heat treatment at a temperature of 850°C for 24 hours. After processing, cool to room temperatu...

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Abstract

The invention discloses a rare earth permanent magnet material, a raw material composition, a preparation method, application and a motor. The rare earth permanent magnet material comprises the following components in percentage by weight: 28.5-33.0 wt% of R; more than 1.5wt% of RH; 0-0.08 wt% of Cu of which the percentage by weight is more than 0 wt%; 0.5-2.0wt% of Co; 0.05-0.30wt% of Ga; 0.95-1.05wt% of B; and Fe and inevitable impurities which are adopted as balance. The R-T-B series permanent magnet material is excellent in performance; under the condition that the content of heavy rare earth elements in the permanent magnet material is 3.0-4.5 wt%, Br is larger than or equal to 12.78 kGs, and Hcj is larger than or equal to 29.55 kOe; and under the condition that the content of the heavy rare earth elements in the permanent magnet material is 1.5-2.5 wt%, Br is larger than or equal to 13.06 kGs, and Hcj is larger than or equal to 26.31 kOe.

Description

technical field [0001] The invention relates to a rare earth permanent magnet material, a raw material composition, a preparation method, an application and a motor. Background technique [0002] R-T-B series rare earth permanent magnet materials have been widely used in modern industry and electronic technology, such as electronic computers, automatic control systems, motors and generators, nuclear magnetic resonance imagers, audio devices, material edge separation devices, communication equipment and many other fields. With the development of new application fields and harsh and changeable application conditions, the demand for products with high coercive force is increasing. [0003] At present, it is generally possible to increase the intrinsic coercive force (Hcj) of the magnet by adding high melting point metals (generally referring to metals with a melting point higher than 1538°C) in the raw material formula of R-T-B series rare earth permanent magnet materials, such...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01F1/057H01F41/02
CPCH01F1/0577H01F41/0253H01F41/0266H01F41/0293H01F1/0573
Inventor 廖宗博骆溁蓝琴黄佳莹
Owner FUJIAN CHANGJIANG GOLDEN DRAGON RARE EARTH CO LTD
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