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High-temperature-resistant and multi-principal-phase high-abundance rare-earth permanent magnet material and preparation method thereof

A rare earth permanent magnet, multi-main phase technology, applied in the fields of magnetic materials, inductance/transformer/magnet manufacturing, magnetic objects, etc., can solve the problems of insignificant improvement in magnetic performance, loss of price advantage, increase in raw material cost, etc. Demagnetization ability, lower temperature coefficient of coercivity, lower energy consumption

Inactive Publication Date: 2018-11-06
JIANGXI UNIV OF SCI & TECH +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Both CN 104882266A and CN 105321702A take NdFeB permanent magnets without light rare earth elements as the research object to carry out grain boundary diffusion, and the diffusion source contains light rare earth elements such as La and Ce, so that the magnetic performance is not significantly improved
[0006] It can be seen from the above that due to the expensive price of heavy rare earths, the use of Dy or Tb elements in grain boundary diffusion to improve the magnetic properties of high-abundance rare earth permanent magnet materials will obviously increase the cost of raw materials and lose the natural price advantage.

Method used

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  • High-temperature-resistant and multi-principal-phase high-abundance rare-earth permanent magnet material and preparation method thereof
  • High-temperature-resistant and multi-principal-phase high-abundance rare-earth permanent magnet material and preparation method thereof
  • High-temperature-resistant and multi-principal-phase high-abundance rare-earth permanent magnet material and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0043] The N35 sintered cerium-iron-boron permanent magnet (cerium accounts for 30% of the total rare earth content) prepared by the multi-main phase process is machined into 10×10×5mm 3 For samples of different sizes, the surface of the sample was polished and polished, washed with alkali, deionized water, and alcohol ultrasonic vibration for more than 20 minutes, and dried for use; commercially available or self-made Pr 77.5 Zn 22.5 Alloy circular target, the diffusion source material is deposited on the surface of the sample by high temperature magnetron sputtering technology, the specific parameters are: sputtering power is 150W, sputtering pressure is 1.0Pa, background vacuum is better than 3×10 -3 Pa, argon gas flow rate 40sccm, substrate stage temperature 600°C, sputtering time 3h; the sample after high temperature deposition was vacuum heat treated at 500°C for 2h, and the coercive force was significantly improved after air cooling to room temperature. Cerium iron bor...

Embodiment 2

[0047] The N38 sintered cerium-iron-boron permanent magnet (cerium accounts for 20% of the total rare earth content) prepared by the multi-main phase process is machined into 10×10×5mm 3 For samples of different sizes, the surface of the sample was polished and polished, washed with alkali, deionized water, and alcohol ultrasonic vibration for more than 20 minutes, and dried for use; commercially available or self-made Pr 70 Cu 15 Ga 15 Alloy circular target, the diffusion source material is deposited on the surface of the sample by high temperature magnetron sputtering technology, the specific parameters are: sputtering power 120W, sputtering pressure 0.9Pa, background vacuum degree is better than 3×10 -3 Pa, argon gas flow rate 40sccm, substrate stage temperature 500°C, sputtering time 4h; the sample after high temperature deposition was vacuum heat treated at tempering temperature 520°C for 4h, and the coercive force was significantly improved after air cooling to room tem...

Embodiment 3

[0051] The N28 sintered cerium-iron-boron permanent magnet (cerium accounts for 50% of the total rare earth content) prepared by the multi-main phase process is machined into 10×10×5mm 3 For samples of different sizes, the surface of the sample was polished and polished, washed with alkali, deionized water, and alcohol ultrasonic vibration for more than 20 minutes, and dried for use; the prepared ingredients were Ho 70 Cu 30 The alloy raw material is put into a vacuum arc melting furnace or an induction melting furnace, and is repeatedly smelted 5 times under the protection of an inert gas, so that the ingot is fully alloyed, and an alloy ingot is obtained after cooling; the obtained alloy ingot is roughly crushed and placed into the quartz tube of the vacuum quenching furnace, and under the protection of the argon atmosphere, the melt is rapidly quenched under the condition of a roll speed of 8m / s to obtain the required rapid quenching strip; the obtained rapid quenching stri...

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Abstract

The invention provides a high-temperature-resistant and multi-principal-phase high-abundance rare-earth permanent magnet material and a preparation method thereof; the method comprises the steps of expanding and doping a sintered state high-abundance rare-earth permanent magnet material with a low-melting-point eutectic alloy without heavy rare earths Dy and Tb through a grain boundary diffusion technology. By expanding and doping the low-melting-point eutectic alloy without heavy rare earths Dy and Tb through the grain boundary diffusion technology, the comprehensive magnetic property and thehigh-temperature resistance of the multi-principal-phase high-abundance rare-earth permanent magnet material are improved.

Description

technical field [0001] The invention belongs to the technical field of rare earth permanent magnet materials, and in particular relates to a high-temperature resistant multi-main phase high-abundance rare earth permanent magnet material and a preparation method thereof. Background technique [0002] Rare earth permanent magnet materials are widely used in emerging technology fields such as wind power generation, new energy vehicles, white goods, and maglev trains due to their excellent magnetic properties. More than 80%. Due to the limited rare earth resources and the sharp increase in the global demand for NdFeB permanent magnet materials, the price of rare earths has risen rapidly, and the consumption of medium and heavy rare earths is huge. In natural rare earth resources, La, Ce, and Y elements are highly abundant. But a lot of backlog. In recent years, the manufacture of high-abundance rare earth permanent magnet materials based on high-abundance rare earths La, Ce, Y...

Claims

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Application Information

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IPC IPC(8): H01F1/057H01F41/02
CPCH01F1/0571H01F41/0293
Inventor 李家节仲洁黄祥云曾亮亮喻玺杜君峰钟震晨杨斌
Owner JIANGXI UNIV OF SCI & TECH
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