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NdFeB spherical micro powder and preparation method thereof

A NdFeB, spherical technology, applied in the field of NdFeB spherical micropowder and its preparation, can solve the problems of low sphericity and uneven particle size distribution, and achieve good sphericity, suitable for promotion, and uniform particle size distribution Effect

Pending Publication Date: 2021-11-19
JIANGXI INST OF RARE EARTHS CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The NdFeB spherical micropowder preparation technology currently mainly used has a series of problems such as uneven particle size distribution and low sphericity.

Method used

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  • NdFeB spherical micro powder and preparation method thereof
  • NdFeB spherical micro powder and preparation method thereof

Examples

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Effect test

Embodiment 1

[0035] This embodiment provides a method for preparing spherical neodymium-iron-boron micropowder. The preparation method specifically includes the following steps:

[0036] (1) Use a shot blasting machine to polish the surface of raw materials such as neodymium and iron, and put the raw materials into the crucible chamber. The total volume of the raw materials accounts for 65% of the crucible chamber, and then vacuumize. After the vacuum reaches 4Pa, fill it with argon gas For protection, heat the crucible to 1340° C. to completely melt the raw materials to obtain NdFeB alloy melt 4 .

[0037] (2) Fill the crucible with an inert gas so that when the pressure difference between the inside and outside of the crucible is 3kPa, the NdFeB alloy melt 4 is more likely to be extruded from the bottom of the crucible, and the input voltage is 20V and the frequency is 100Hz. The pulse signal drives the piezoelectric The displacement of the ceramic 2 drives the transmission rod 3 to perf...

Embodiment 2

[0040] This embodiment provides a method for preparing spherical neodymium-iron-boron micropowder. The preparation method specifically includes the following steps:

[0041] (1) Use a shot blasting machine to polish the surface of raw materials such as neodymium and iron, and put the raw materials into the crucible chamber. The total volume of the raw materials accounts for 60% of the crucible chamber, and then vacuumize. After the vacuum reaches 4Pa, fill it with argon. For protection, heat the crucible to 1400° C. to completely melt the raw materials to obtain NdFeB alloy melt 4 .

[0042] (2) Fill the crucible with an inert gas so that when the pressure difference between the inside and outside of the crucible is 3kPa, the NdFeB alloy melt 4 is more likely to be extruded from the bottom of the crucible, and the input voltage is 30V and the frequency is 120Hz. The pulse signal drives the piezoelectric The displacement of the ceramic 2 drives the transmission rod 3 to perform...

Embodiment 3

[0045] This example provides a method for preparing spherical NdFeB micropowder. The difference between this example and Example 1 is that in step (3), the gas flow rate is 200 m / s. All the other processing parameters and operation steps are identical with embodiment 1.

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Abstract

The invention provides a neodymium-iron-boron spherical micro powder and a preparation method thereof. The preparation method comprises the steps that inert gas is filled into a container for alloy raw materials and is melted into alloy melt, pulse signals with certain voltage and frequency are input into piezoelectric ceramics, under the internal and external pressure difference, the alloy melt is extruded out of the bottom of the container and freely falls, an atomizing nozzle sprays out gas, the gas impacts and crushes the molten metal liquid extruded from the bottom of the container to form small liquid drops, and the small liquid drops are cooled and solidified to obtain the neodymium iron boron spherical micro powder. The neodymium iron boron spherical micro powder comprises Nd, Ce, La, Y, B, Pr, Cu, Hf, Ho, Zr, Gd, Al, Co, Ga, Ti, Dy, Tb and Fe. The neodymium-iron-boron alloy melt with certain chemical components is prepared, the formed neodymium-iron-boron spherical micro powder is uniform in particle size distribution and good in sphericity degree, the spherical micro powder prepared through the preparation method can better meet the requirements of neodymium-iron-boron bonded magnets and neodymium-iron-boron magnet 3D printing for the spherical micro powder, the process is controllable, and the preparation method is suitable for popularization.

Description

technical field [0001] The invention belongs to the technical field of metal and alloy powder preparation, and relates to the preparation of neodymium-iron-boron micropowder, in particular to a neodymium-iron-boron spherical micropowder and a preparation method thereof. Background technique [0002] NdFeB permanent magnet materials have been widely used in wind power generation, electric vehicles, consumer electronics (mobile phones, audio, televisions, notebook computers, etc.), biomedical instruments, permanent magnet motors and other fields. Modern science and technology and information industry are developing towards integration, thinning, miniaturization and intelligent methods. The emergence of NdFeB permanent magnet materials has greatly promoted the progress of modern science and technology and information industry, and is an important material basis for it. one. With the rapid development of new energy vehicles and intelligent manufacturing, the demand for NdFeB pe...

Claims

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Application Information

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IPC IPC(8): H01F41/02H01F1/057
CPCH01F41/0253H01F1/0571
Inventor 马强沈保根赵同云李志彬
Owner JIANGXI INST OF RARE EARTHS CHINESE ACAD OF SCI
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