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Manufacturing method of micron and nanometer metal spherical powder

A spherical powder, manufacturing method technology, applied in nanotechnology, nanotechnology for materials and surface science, nanotechnology, etc., can solve the problems of difficult to use spherical metal powder, low production efficiency and high preparation cost

Active Publication Date: 2015-01-07
NANJING UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the production efficiency of the droplet jetting method is low, the preparation cost is high, and it is difficult to prepare metal balls with a size less than 100 μm
Therefore, the spherical metal powder prepared by the droplet injection method is difficult to be used in powder metallurgy, 3D printing, spray (brazing) welding metal powder, lubricant materials and other fields that require a large amount of metal powder.

Method used

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  • Manufacturing method of micron and nanometer metal spherical powder
  • Manufacturing method of micron and nanometer metal spherical powder
  • Manufacturing method of micron and nanometer metal spherical powder

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] For the preparation of silver microspheres, at first, a variety of purchased metallic silver powders with an average size of about 10 μm (the shape of the particles is flake-like or other angular shapes) are used as raw materials. Take 1 gram of silver powder and flake graphite powder with a size of about 1 μm in a ratio of 1:1 by weight, and mix them uniformly by mechanical stirring (including ball milling or rod milling).

[0037] Put the mixed silver / graphite powder into the alumina crucible, put the crucible into the non-heating zone of the annealing furnace, and evacuate to 6×10 -3 Pa, heat the heating zone of the annealing furnace to 1050°C, push the crucible with silver / graphite powder into the heating zone at 1050°C, and keep it for 5 minutes, then pull the crucible with silver / graphite powder out of the heating zone to cool quickly.

[0038] The silver / graphite mixed powder is soaked in water, and the silver microspheres are obtained by ultrasonic cleaning. fi...

Embodiment 2

[0040] For the preparation of copper microspheres, firstly, metal copper powder with a size of about 3 μm-10 μm is purchased as a raw material. Take 1 gram of copper powder and graphene powder with a size of about 10nm-1μm, and mix them uniformly by mechanical stirring at a ratio of 5:1 by weight.

[0041] Put the mixed copper / graphene mixed powder into the alumina crucible, put the crucible into the non-heating zone of the annealing furnace, and evacuate to 6×10 -3 Pa, heat the heating zone of the annealing furnace to 1150°C, push the crucible containing the copper / graphene mixed powder into the heating zone of 1150°C, keep it warm for 5 minutes, pull out the crucible containing the copper / graphene mixed powder to heat zone cooling.

[0042] The copper / graphene mixed powder is soaked in water, and the copper microspheres are obtained by ultrasonic cleaning. image 3 It is a scanning electron micrograph of the appearance of the obtained copper microspheres, and the size of t...

Embodiment 3

[0044] For the preparation of aluminum microspheres, firstly, metal aluminum powder with an average size of about 5 μm is purchased as a raw material. Take 1 gram of aluminum powder and flake graphite powder with a size of about 400nm, and mix them uniformly in an alcohol solution by ultrasonic at a ratio of 1:2 by weight. After drying, the metal aluminum / graphite mixed powder is obtained.

[0045] Put the mixed aluminum / graphite mixed powder into the quartz tube, and evacuate the quartz tube to 6×10 -3 Pa, pass argon to 0.06MPa and then seal the tube. Put the quartz tube with aluminum / graphite mixed powder protected by argon into an annealing furnace heated to 740°C, keep it warm for 6 minutes, and take it out to cool in the air outside the furnace.

[0046] The aluminum / graphite mixed powder is soaked in alcohol, and the aluminum micron-spherical powder is obtained by ultrasonic cleaning. image 3 This is the scanning electron micrograph of the appearance of the obtained a...

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Abstract

The invention provides a manufacturing method of micron and nanometer metal spherical powder. The manufacturing method comprises the steps of 1 preparing metal powder; 2 preparing evenly mixed powder of the metal powder and carbon material powder or ceramic material powder; 3 performing high-temperature annealing to enable metal to be molten and solidify to form a metal ball, wherein the temperature for the high-temperature annealing is the temperature for metal melting, especially the temperature is higher than metal melting point temperature and ranges from 40 DEG C to 100 DEG C; 4 removing the carbon material powder or the ceramic material powder to obtain the micron and nanometer metal spherical powder. All metals of the metal spherical powder are elemental metals containing gold, silver, copper, aluminum, gallium, tin, zinc, lead, iron, cobalt, nickel, rare earth and the like, and alloy and compounds formed by the elemental metals are alloy and compounds formed by the metals including boron, silicon, carbon, phosphorus, germanium, nitrogen and the like and nonmetal.

Description

technical field [0001] The invention relates to a method for manufacturing micron and nanometer metal spherical powders suitable for powder metallurgy, metal 3D printing, spray (brazing) metal powder, lubricating materials, solar cells, solid fuel propellants, electronic packaging, and precision preparation fields. Background technique [0002] Spherical metal powder can be used in powder metallurgy, 3D metal printing, spray (brazing) metal powder, lubricant materials, solar cells, electronic packaging, precision preparation fields, etc. At present, the existing methods of preparing spherical metal particles can be roughly divided into three categories from the aspect of ball forming mechanism: gas atomization method and centrifugal atomization method based on liquid droplet jet solidification into ball; There are cutting or punching remelting method; uniform droplet injection method and pulse small hole injection method [1] . [0003] The atomization method is the method ...

Claims

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Application Information

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IPC IPC(8): B22F9/06B22F1/00B82Y40/00B82Y30/00
Inventor 唐少龙程振之雷成龙黄海富都有为
Owner NANJING UNIV
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