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Method for preparing Nd-Fe-B nanopowder through chemical method combined with pulsed magnetic field

A technology of pulsed magnetic field and nano-powder, which is applied in the direction of nanotechnology, can solve the problems of poor crystallinity of crystal grains, and achieve the effects of improving the magnetic properties of particles, promoting bonding, and increasing crystallinity

Active Publication Date: 2019-07-05
SHENYANG POLYTECHNIC UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The main technical problem to be solved in the present invention is to overcome the problem of poor crystallinity of crystal grains formed in the liquid phase in the preparation of Nd-Fe-B nano-powder by chemical method

Method used

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  • Method for preparing Nd-Fe-B nanopowder through chemical method combined with pulsed magnetic field
  • Method for preparing Nd-Fe-B nanopowder through chemical method combined with pulsed magnetic field
  • Method for preparing Nd-Fe-B nanopowder through chemical method combined with pulsed magnetic field

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] A three-necked flat-bottomed flask with a volume of 250mL was selected as the reaction device, and the induction coil was a 5mm-diameter, 10-turn helical coil. In the glove box, add 100 mL of oleylamine solution into a three-neck flat bottom flask and add 1.35 mmol Nd(acac) 3 and 7.75mmol Fe(acac) 3 , stir and dissolve at 120°C, connect the condenser, and quickly inject 1 mmol (C 2 h 5 ) 3 NBH 3 , raise the temperature to 330°C, pass a 50A current into the induction coil, control the frequency at 1Hz, keep it for 5min, and pass it in every 10min. After cooling to room temperature for 1 hour, a solution containing black particles was obtained. Then mix it with ethanol and n-hexane solution, centrifuge for 10 minutes at a centrifugal speed of 12000r / min, pour off the upper liquid, continue to add ethanol and n-hexane mixed solution, and repeat centrifugation three times to obtain black particles, which can be sealed in In the mixed solution of n-hexane and oleylamin...

Embodiment 2

[0034] A three-necked flat-bottomed flask with a volume of 250mL was selected as the reaction device, and the induction coil was a 5mm-diameter, 10-turn helical coil. In the glove box, add 100 mL of oleylamine solution into a three-neck flat bottom flask and add 1.35 mmol Nd(acac) 3 and 7.75mmol Fe(acac) 3 , stir and dissolve at 120°C, connect the condenser, and quickly inject 1mmol (C 2 h 5 ) 3 NBH 3 , raise the temperature to 330°C, pass a 100A current into the induction coil, control the frequency at 2.5Hz, keep it for 5min, and pass it in every 10min. After cooling to room temperature for 1 hour, a solution containing black particles was obtained. Then mix it with ethanol and n-hexane solution, centrifuge for 10 minutes at a centrifugal speed of 12000r / min, pour off the upper liquid, continue to add ethanol and n-hexane mixed solution, and repeat centrifugation three times to obtain black particles, which can be sealed in In the mixed solution containing n-hexane and...

Embodiment 3

[0036] A three-necked flat-bottomed flask with a volume of 250mL was selected as the reaction device, and the induction coil was a 5mm-diameter, 10-turn helical coil. In the glove box, add 100 mL of oleylamine solution into a three-neck flat bottom flask, and add 2.7 mmol Nd(acac) 3 and 15.50mmol Fe(acac) 3Stir and dissolve at 120°C, connect the condenser, and quickly inject 2mmol (C 2 h 5 ) 3 NBH 3 , raise the temperature to 330°C, pass a 150A current into the induction coil, control the frequency at 5Hz, keep it for 5min, and pass it in every 10min. After cooling to room temperature for 1 hour, a solution containing black particles was obtained. Then mix it with ethanol and n-hexane solution, centrifuge for 10 minutes at a centrifugal speed of 12000r / min, pour off the upper liquid, continue to add ethanol and n-hexane mixed solution, and repeat centrifugation three times to obtain black particles, which can be sealed in In the mixed solution containing n-hexane and ole...

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Abstract

The invention provides a method for preparing Nd-Fe-B nanopowder through a chemical method combined with a pulsed magnetic field. The method comprises the steps of placing a three-necked flat-bottom flask in a pulse coil, adding a certain amount of an oleylamine (OA) solution into the three-necked flat-bottom flask, and dissolving Nd(acac)3 and Fe(acac)3 salt in the OA solution; stirring and heating the above solution at certain temperature for a period of time and quickly adding a B source; heating the above solution to a certain temperature, conducting heat insulation for a certain period oftime, inputting the pulse current into the coil at the flat-bottom flask intermittently through a pulse transmitter in the process to generate the pulsed magnetic field; and cooling the solution to the indoor temperature 20-25 DEG C to obtain a solution containing black particles, conducting centrifugal separation on the black particles in the solution and storing the black particles in a normalhexane solution containing a little OA solution. The method has the advantages that the preparation technological period is shortened, and the preparation cost is reduced; kinetic energy of particlesis changed, bonding of the particles is promoted, the particles are subjected to orientated magnetization, and the crystallinity degree of the particles along the easy magnetization axis is improved.

Description

technical field [0001] The invention belongs to the field of rare earth permanent magnet powder making of functional materials, and relates to a method for preparing Nd-Fe-B nanometer powder by using a chemical method combined with a pulsed magnetic field. This preparation method is also applicable to the preparation of other Re-Fe-B powder materials. Background technique [0002] In recent years, magnetic nanomaterials have been widely used in various permanent magnetic material devices due to their unique structures, electrical and magnetic properties. For example, in modern energy conversion devices such as electric vehicles, wind power generators, information storage, and energy conversion systems. In particular, Nd-Fe-B-based permanent magnets have better magnetic properties, which can make these devices and systems smaller, lighter, and more energy-efficient. At present, the main methods for preparing Nd-Fe-B alloys are powder metallurgy, arc melting, high-energy bal...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22F9/24B82Y40/00
CPCB22F9/24B82Y40/00B22F2999/00B22F2202/05
Inventor 郭耀祖尤俊华关维周继凤曲迎东于酋慈孟庆宇
Owner SHENYANG POLYTECHNIC UNIV
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