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

A technology of R-T-B and permanent magnet materials, which is applied in the direction of magnetic materials, inductor/transformer/magnet manufacturing, magnetic objects, etc., and can solve problems such as poor consistency and magnet performance degradation

Active Publication Date: 2020-06-23
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 defects in the prior art that when B<5.88at% in the R-T-B system magnet, the magnet performance is deteriorated and the consistency is poor, and a kind of R-T-B system permanent magnet material and its preparation method and application are provided

Method used

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

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0082] The raw materials used for preparing the R-T-B series permanent magnet material in the present embodiment are as shown in Table 1, and the process of its preparation is as follows:

[0083] (1) Melting: according to the formula shown in Table 1, take the prepared raw materials and put them into an alumina crucible, and carry out the melting process at a temperature of 1500°C in a high-frequency vacuum induction melting furnace under the condition that the vacuum degree is less than 0.02Pa. Vacuum melting.

[0084] (2) Casting: Ar gas is introduced into the smelting furnace after vacuum smelting to make the air pressure reach 55,000 Pa, and then casting is carried out, and the melt is passed through a copper roller with a speed of 29 rpm to obtain a quick-setting with a thickness of 0.12-0.35mm Alloy sheets, during the casting process, the copper rollers need to be fed with chilled water, and the water inlet temperature is ≤25°C (as shown in Table 2); 2 ℃ / sec-10 4 °C / s...

Embodiment 2～20、 comparative example 1～12

[0103] Raw materials were prepared according to the formula shown in Table 1. Except for the conditions shown in Table 2, other process conditions were the same as in Example 1 to obtain the R-T-B series permanent magnet material.

[0104] Table 2

[0105]

[0106]

[0107]

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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 R, Ga, Cu, Al, Fe and B, and further comprises one or more of Ti, Zr and Nb, and the content of R is 28.5-33.03% in percentage by weight; contents of the R-T-B series permanent magnet material are as follows: the content of Ga is 0.35% or more, the content of Cu is 0.4% or above, the content of B is 0.84-0.945%,, the content of Al is less than 0.08%, and the R-T-B series permanent magnet material does not contain Co. The R-T-Bseries permanent magnet material is high in coercive force Hcj and Br, good in magnet temperature stability and excellent in performance; and the demagnetization curve of the R-T-B series permanent magnet material has no step, the relative permeability is low, and the uniformity of the magnetic steel is good.

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, and B refers to boron elements) are currently the most widely used rare earth permanent magnet materials, and are widely used in electronics, electrical machinery, and medical equipment. , toys, packaging, hardware machinery, aerospace and other fields, the more common permanent magnet motors, speakers, magnetic separators, computer disk drives, magnetic resonance imaging equipment and instruments, etc. [0003] It is found in the experiment that when the B content is high, more B-rich phases will be formed, which in turn will affect the remanence properties of the product. Therefore, in order to increase the remanence of R-T-B sintered magnets, it is usually necessary to ...

Claims

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Application Information

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IPC IPC(8): H01F1/057H01F41/02
CPCH01F1/0577H01F41/0253H01F41/0266
Inventor 付刚黄清芳黄佳莹陈大崑许德钦
Owner FUJIAN CHANGJIANG GOLDEN DRAGON RARE EARTH CO LTD
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