R-T-B magnet material, preparation method and application thereof

A R-T-B, magnet technology, applied in the direction of magnetic materials, magnetic objects, inductance/transformer/magnet manufacturing, etc., can solve the problems of poor magnetic properties and small diffusion of magnet materials

Active Publication Date: 2020-05-29
FUJIAN CHANGJIANG GOLDEN DRAGON RARE EARTH CO LTD
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  • Summary
  • 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 boundar

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

Examples

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Example Embodiment

[0089] Example 1

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

[0091] Table 1

[0092]

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

[0094] Among them, smelting and casting: Place the raw material formula for smelting in Table 1 in a medium-frequency vacuum induction quick-setting belt spinning furnace for smelting and casting, with a frequency of 1500-2500 Hz. The melting temperature is 1450-1550°C, and the casting temperature is 1350-1500°C. After melting and casting, 0.2-0.4mm alloy flakes are obtained.

[0095] Hydrogen crushing and pulverizing: pass hydrogen with a purity of 99.9% into the hydrogen crushing furnace and maintain the hydrogen pressure at 0.15Mpa. After fully absorbing hydrogen, increase the tem...

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Abstract

The invention discloses an R-T-B magnet material, a preparation method and an application thereof. The preparation method of the R-T-B magnet material comprises the following steps: performing hydrogen activation treatment on a sintered body of the R-T-B magnet material in a gas atmosphere; and then performing grain boundary diffusion, wherein the gas atmosphere includes a mixed gas of an inert gas and hydrogen; a temperature of the hydrogen activation treatment is 100-300 DEG C, and time is more than 10 minutes; a ratio of amass volume concentration of the hydrogen to the mass volume concentration of the sintered body is 0.01-0.1%; and the volume ratio of the hydrogen to the inert gas is 0.1-5%. The R-T-B magnet material disclosed by the invention is relatively good in high-temperature resistance, demagnetization resistance and coercive force; rare earth elements or a large amount of cobalt elements are not added during smelting so that cost is relatively low; grain refinement can beavoided, and production difficulty is low; and the R-T-B magnet material with a length within 1 mm in anorientation direction can be obtained, and the magnet material is good in magnetic performance.

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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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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