A kind of neodymium iron boron material and its preparation method and application

A permanent magnet material, R-T-B technology, applied in the direction of magnetic materials, inductors/transformers/magnet manufacturing, magnetic objects, etc., can solve the problems of magnet performance degradation and poor consistency, and achieve low magnetic permeability, good temperature stability, and high performance excellent effect

Active Publication Date: 2021-07-30
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 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 to provide a neodymium-iron-boron material and its preparation method and application

Method used

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  • A kind of neodymium iron boron material and its preparation method and application
  • A kind of neodymium iron boron material and its preparation method and application
  • A kind of neodymium iron boron 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: 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 For alloy sheets, during the casting process, the copper roller needs to be fed with chilled water, and the temperature of the water inlet is ≤25°C; at 10 2 ℃ / sec-10 4 °C / sec co...

Embodiment 2～26、 comparative example 1～11

[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.

Embodiment 27～30

[0103] The raw materials of Examples 27 to 30 are the same as those in Example 22, except for the conditions shown in Table 2, other process conditions are the same as those in Example 22, and R-T-B sintered magnets are obtained.

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Abstract

The invention discloses a neodymium-iron-boron material and its preparation method and application, which comprises: R, Cu, Al, Fe and B, and also contains one or more of Ti, Zr and Nb, in weight percentage, its The content is as follows: R content is 28.5-33.2%; Cu content is more than 0.393%; B content is 0.84-0.945%; Al content is less than 0.08%; R-T-B series permanent magnet materials do not contain Co; ‑T‑B series permanent magnet materials contain R 2 Fe 14 B main phase, grain boundary phase and rare earth-rich phase; among them, the grain boundary phase contains R 6 Fe 13 Cu; 6 Fe 13 The volume fraction of Cu is ≥ 3.5%. The NdFeB 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 neodymium-iron-boron 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 to redu...

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 付刚胡季帆陈大崑黄清芳黄佳莹许德钦
Owner FUJIAN CHANGTING GOLDEN DRAGON RARE EARTH CO LTD
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