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A kind of rare earth permanent magnet material and its preparation method and application

A permanent magnet material, rare earth-rich phase technology, applied in magnetic materials, inductance/transformer/magnet manufacturing, magnetic objects, etc., can solve the problems of magnet performance degradation, poor consistency, etc.

Active Publication Date: 2021-08-06
FUJIAN CHANGTING 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 of magnet performance degradation and poor consistency when B<5.88at% in the R-T-B magnet in the prior art, and provide a rare earth permanent magnet material and its preparation method and application

Method used

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  • A kind of rare earth permanent magnet material and its preparation method and application
  • A kind of rare earth permanent magnet material and its preparation method and application
  • A kind of rare earth permanent magnet material and its preparation method and application

Examples

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Effect test

Embodiment 1

[0081] 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:

[0082] (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.

[0083] (2) Casting process: Ar gas is introduced into the smelting furnace after vacuum smelting to make the air pressure reach 55,000 Pa, and then the casting is carried out, and the molten liquid is passed through a copper roller with a speed of 29 rpm to obtain a speed of 0.12-0.35mm thickness. Condensed gold sheet, during the casting process, the copper roller needs to be fed with chilled water, and the water inlet temperature is ≤25°C (as shown in Table 2); 2 ℃...

Embodiment 2～24、 comparative example 1～8

[0101] 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.

[0102] Table 2

[0103]

[0104]

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Abstract

The invention discloses a rare earth permanent magnet material, a preparation method and application thereof. The rare earth permanent magnet material includes: R, Ga, Al, Fe and B, and also includes one or more of Ti, Zr and Nb, and its content is as follows in terms of weight percentage: the content of R is 28.5-33.05%; The content of Al is greater than 0.35%; the content of B is 0.84-0.945%; the content of Al is less than 0.08%; R-T-B permanent magnet materials do not contain Co. The rare earth permanent magnet material of the invention has high coercivity Hcj and Br, good temperature stability of the magnet, and excellent performance; and the demagnetization curve has no steps, the relative magnetic permeability is low, and the uniformity of the magnet steel is good.

Description

technical field [0001] The invention relates to a rare earth permanent magnet material and a preparation method and application thereof. 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 ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01F1/057H01F41/02
CPCH01F1/0577H01F41/0266
Inventor 付刚黄佳莹黄清芳黄吉祥
Owner FUJIAN CHANGTING GOLDEN DRAGON RARE EARTH CO LTD
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