R-T-B series magnetic material and preparation method thereof

A R-T-B, magnetic material technology, applied in the direction of magnetic material, magnetic object, inductor/transformer/magnet manufacturing, etc., can solve the problems of limited improvement, high cost, no significant improvement, etc.

Active Publication Date: 2020-09-04
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

Although there are a few reports in the prior art that substituting part of praseodymium for neodymium can improve the performance of magnet materials, the degree of improvement is limited and there is still no significant improvement
On the other hand, the NdFeB magnet material with better coercive force and remanent magnetism in the prior art also needs to rely on the addition of a large amount of heavy rare earth elements, and the cost is relatively expensive

Method used

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  • R-T-B series magnetic material and preparation method thereof
  • R-T-B series magnetic material and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0106] (1) Melting process: According to the formula shown in Table 1, take 50-500kg of the prepared raw materials, put them in a crucible made of alumina, and place them in a high-frequency vacuum induction melting furnace at 5×10 -2 Vacuum melting is performed at 1400-1500°C in a vacuum of Pa.

[0107] (2) Casting process: Ar gas is introduced into the smelting furnace after vacuum smelting to make the pressure reach 55,000 Pa, and then the casting is carried out. 2 ℃ / sec-10 4 The cooling rate of °C / sec obtains a quenched alloy.

[0108] (3) Hydrogen breaking and pulverizing process: Vacuum the hydrogen breaking furnace where the quench alloy is placed at 20-25℃ for 5×10 -2 Pa, then pass hydrogen with a purity of 99.9% into the hydrogen-breaking furnace, maintain the hydrogen pressure at 0.15MPa, fully absorb hydrogen, raise it to 500-550°C, fully dehydrogenate, then cool, and take out the hydrogen-breaking crushed powder.

[0109] (4) Fine pulverization process: Under a nitrogen a...

Embodiment 2

[0115] (1) Melting process: According to the formula shown in Table 1, take 50-500kg of the prepared raw materials, put them in a crucible made of alumina, and place them in a high-frequency vacuum induction melting furnace at 5×10 -2 Vacuum melting is performed at 1400-1500°C in a vacuum of Pa.

[0116] (2) Casting process: Ar gas is introduced into the smelting furnace after vacuum smelting to make the pressure reach 55,000 Pa, and then the casting is carried out. 2 ℃ / sec-10 4 The cooling rate of °C / sec obtains a quenched alloy.

[0117] (3) Hydrogen breaking and pulverizing process: Vacuum the hydrogen breaking furnace where the quench alloy is placed at 20-25℃ for 5×10 -2 Pa, then pass hydrogen with a purity of 99.9% into the hydrogen-breaking furnace, maintain the hydrogen pressure at 0.15MPa, fully absorb hydrogen, raise it to 500-550°C, fully dehydrogenate, then cool, and take out the hydrogen-breaking crushed powder.

[0118] (4) Fine pulverization process: Under a nitrogen a...

Embodiment 3

[0124] (1) Melting process: According to the formula shown in Table 1, take 50-500kg of the prepared raw materials, put them in a crucible made of alumina, and place them in a high-frequency vacuum induction melting furnace at 5×10 -2 Vacuum melting is performed at 1400-1500°C in a vacuum of Pa.

[0125] (2) Casting process: Ar gas is introduced into the smelting furnace after vacuum smelting to make the pressure reach 55,000 Pa, and then the casting is carried out. 2 ℃ / sec-10 4 The cooling rate of °C / sec obtains a quenched alloy.

[0126] (3) Hydrogen breaking and pulverizing process: Vacuum the hydrogen breaking furnace where the quench alloy is placed at 20-25℃ for 5×10 -2 Pa, then pass hydrogen with a purity of 99.9% into the hydrogen-breaking furnace, maintain the hydrogen pressure at 0.15MPa, fully absorb hydrogen, raise it to 500-550°C, fully dehydrogenate, then cool, and take out the hydrogen-breaking crushed powder.

[0127] (4) Fine pulverization process: Under a nitrogen a...

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Abstract

The invention discloses an R-T-B series magnetic material which is characterized by comprising the following components in percentage by weight of 29.50-33.28 wt.% of R, 0.24 wt.% to 0.80 wt.% of Cu,0.31 wt.% to 0.75 wt.% of Zr, 0 wt.% to 1.52 wt.% of Al, 0.90 wt.% to 1.03 wt.% of B, and 0.05 wt.% to 1.50 wt.% of Ga, wherein R is a rare earth element and comprises Pr and RH, Pr is greater than orequal to 15.00 wt.%, and RH comprises Tb and/or Dy. The magnetic material has better residual magnetism, coercive force, temperature coefficient and the like.

Description

Technical field [0001] The invention relates to an R-T-B series magnetic material and a preparation method thereof. Background technique [0002] In Nd 2 Fe 14 B is the main component of neodymium iron boron (NdFeB) magnet material, which has high remanence, coercivity and maximum magnetic energy product, and has excellent comprehensive magnetic properties. It is used in wind power generation, new energy vehicles, and frequency conversion home appliances. At present, the rare earth components in the neodymium iron boron magnet materials in the prior art are usually neodymium with only a small amount of praseodymium. Although there are a few reports in the prior art that replacing part of the neodymium with praseodymium can improve the performance of the magnet material, the degree of improvement is limited and there is still no significant improvement. On the other hand, the neodymium iron boron magnet material with good coercivity and remanence properties in the prior art also ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01F1/057H01F41/02
CPCH01F1/0577H01F41/0253H01F41/0266
Inventor 付刚黄佳莹黄清芳许德钦
Owner FUJIAN CHANGJIANG GOLDEN DRAGON RARE EARTH CO LTD
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