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

A R-T-B, magnet technology, applied in the manufacturing of magnetic materials, magnetic objects, inductors/transformers/magnets, etc., can solve the problems of poor magnetic properties and small diffusion of magnet materials, achieve good coercivity and remanence, and difficulty in production Small, small effect of oxidation control requirements

Active Publication Date: 2021-11-05
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

[0008] The technical problem to be solved by the present invention is to overcome the defects in the current prior art that the heavy rare earth elements only diffuse along the neodymium-rich phase in the grain boundary diffusion treatment, and the diffusion amount is small, and the magnetic properties of the obtained magnet materials are poor. , and provide a kind of R-T-B magnet material and its preparation method and application

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

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Embodiment 1

[0090] The raw material formula of R-T-B magnet material in the present embodiment is as shown in table 1 below:

[0091] Table 1

[0092]

[0093] (1) According to the raw material formula in Table 1, a blank was prepared by smelting, casting, hydrogen crushing, pressing and sintering. The size of the blank was 65 (length)×50 (pressing direction)×40mm (orientation direction).

[0094] Among them, smelting and casting: the raw material formula for smelting in Table 1 is placed in an intermediate frequency vacuum induction quick-setting belt furnace for smelting and casting, and the frequency of the intermediate frequency is 1500-2500 Hz. The melting temperature is 1450-1550°C, and the casting temperature is 1350-1500°C. Alloy flakes of 0.2-0.4mm are obtained after melting and casting.

[0095] Hydrogen powder making: Introduce hydrogen gas with a purity of 99.9% into the hydrogen furnace, maintain the hydrogen pressure at 0.15Mpa, after fully absorbing hydrogen, heat up w...

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Abstract

The invention discloses an R-T-B magnet material, a preparation method and application thereof. The preparation method of the R-T-B magnet material includes the following steps: the sintered body of the R-T-B magnet material is activated by hydrogen in a gas atmosphere, and then the grain boundary is diffused; the gas atmosphere includes an inert gas and A mixed gas of hydrogen; the temperature of hydrogen activation treatment is 100-300°C, and the time is more than 10 minutes; the ratio of the mass volume concentration of hydrogen to the mass volume concentration of the sintered body is 0.01-0.1%; the volume ratio of hydrogen to inert gas is 0.1- 5%. The R-T-B magnet material of the present invention has better high temperature resistance, anti-demagnetization performance and better coercive force; it does not need to increase the weight of rare earth elements or a large amount of cobalt elements during smelting, and the cost is low; it does not need to carry out grain refinement, making production difficult Small; R-T-B magnet materials with a length of less than 1mm in the orientation direction can be obtained and magnet materials with better magnetic properties.

Description

technical field [0001] The invention relates to an R-T-B magnet material and its preparation method and application. Background technique [0002] Sintered NdFeB rare earth permanent magnet materials have been rapidly developed due to their excellent magnetic properties. Sintered NdFeB rare earth permanent magnet materials are generally processed and ground, grain boundaries diffused, and then electroplated to obtain components. In the process of processing and electroplating, such as electric spark, slicing, pickling, etc. will cause unnecessary loss to the magnetic properties of the magnet material (such as coercive force, high temperature resistance and demagnetization resistance). [0003] In the prior art, the coercive force and high temperature resistance and demagnetization resistance of R-T-B magnet materials are generally improved through the following three methods. [0004] (1) Add a large amount of heavy rare earth elements Dy and Tb, or high temperature resista...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01F41/02H01F1/057
CPCH01F1/0577H01F41/0293
Inventor 王金磊黄清芳黄佳莹
Owner FUJIAN CHANGJIANG GOLDEN DRAGON RARE EARTH CO LTD
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