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

A technology of R-T-B and magnetic materials, applied in the direction of magnetic materials, magnetic objects, inductors/transformers/magnets, etc., can solve the problems of high cost, no significant improvement, and limited improvement

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

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0109] (1) Melting process: According to the formula shown in Table 1, take 50-500 kg of the prepared raw materials, put them into a crucible made of alumina, and heat them in a high-frequency vacuum induction melting furnace at 5×10 -2 Vacuum melting is carried out at 1400-1500°C in a vacuum of Pa.

[0110] (2) Casting process: after vacuum smelting, Ar gas is passed into the smelting furnace to make the air pressure reach 55,000 Pa, and then casting is carried out at 10 2 ℃ / sec-10 4 °C / sec cooling rate to obtain quenched alloy.

[0111] (3) Hydrogen crushing process: At 20-25°C, vacuumize the hydrogen crushing furnace where the quenched alloy is placed 5×10 -2 Pa, and then feed hydrogen gas with a purity of 99.9% into the hydrogen crushing furnace to maintain the hydrogen pressure at 0.15MPa. powder.

[0112] (4) Micro-grinding process: Under a nitrogen atmosphere with a content of less than 150ppm, under the condition of a crushing chamber pressure of 0.38MPa, the powde...

Embodiment 2

[0118] (1) Melting process: According to the formula shown in Table 1, take 50-500 kg of the prepared raw materials, put them into a crucible made of alumina, and heat them in a high-frequency vacuum induction melting furnace at 5×10 -2 Vacuum melting is carried out at 1400-1500°C in a vacuum of Pa.

[0119] (2) Casting process: after vacuum smelting, Ar gas is passed into the smelting furnace to make the air pressure reach 55,000 Pa, and then casting is carried out at 10 2 ℃ / sec-10 4 °C / sec cooling rate to obtain quenched alloy.

[0120] (3) Hydrogen crushing process: At 20-25°C, vacuumize the hydrogen crushing furnace where the quenched alloy is placed 5×10 -2 Pa, and then feed hydrogen gas with a purity of 99.9% into the hydrogen crushing furnace to maintain the hydrogen pressure at 0.15MPa. powder.

[0121] (4) Micro-grinding process: Under a nitrogen atmosphere with a content of less than 150ppm, under the condition of a crushing chamber pressure of 0.38MPa, the powde...

Embodiment 3

[0127] (1) Melting process: According to the formula shown in Table 1, take 50-500 kg of the prepared raw materials, put them into a crucible made of alumina, and heat them in a high-frequency vacuum induction melting furnace at 5×10 -2 Vacuum melting is carried out at 1400-1500°C in a vacuum of Pa.

[0128] (2) Casting process: after vacuum smelting, Ar gas is passed into the smelting furnace to make the air pressure reach 55,000 Pa, and then casting is carried out at 10 2 ℃ / sec-10 4 °C / sec cooling rate to obtain quenched alloy.

[0129] (3) Hydrogen crushing process: At 20-25°C, vacuumize the hydrogen crushing furnace where the quenched alloy is placed 5×10 -2 Pa, and then feed hydrogen gas with a purity of 99.9% into the hydrogen crushing furnace to maintain the hydrogen pressure at 0.15MPa. powder.

[0130] (4) Micro-grinding process: Under a nitrogen atmosphere with a content of less than 150ppm, under the condition of a crushing chamber pressure of 0.38MPa, the powde...

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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 27.42-33.00 wt.% of R,0.24 wt.% to 0.80 wt.% of Cu, 0.19 wt.% to 0.30 wt.% of Zr, 0 wt.% to 1.52 wt.% of Al, 0.90 wt.% to 1.03 wt.% of B, and 0.04 wt.% to 0.09 wt.% of Ga or 0.28 wt.% to 1.50 wt.% of Ga, wherein R is a rare earth element and comprises Pr and RH, Pr is greater than or equal 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] Take Nd 2 Fe 14 Neodymium-iron-boron (NdFeB) magnet material with B as the main component has high remanence, coercive force and maximum magnetic energy product, and excellent comprehensive magnetic properties. It is used in wind power generation, new energy vehicles, and frequency conversion home appliances. The rare earth components in the current NdFeB magnet materials in the prior art are usually mainly neodymium, with only a small amount of praseodymium. 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 materials with better coercive force and remanent magnetism in the prior art also need to rely on the ad...

Claims

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Application Information

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IPC IPC(8): H01F1/057H01F41/02
CPCH01F1/0577H01F41/0253H01F41/0266Y02E10/72
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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