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Preparation method for superfine low-oxygen-content spherical copper powder

A technology of spherical powder and manufacturing method, which is applied in the manufacturing field of ultra-fine low-oxygen content copper spherical powder, can solve the problem that the manufacturing process of spherical copper powder is not specifically involved, etc., and achieves good microstructure consistency, no macrosegregation and distribution. narrow effect

Active Publication Date: 2015-09-02
NANJING UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the patent does not specifically involve the manufacturing process of ultra-fine, low-oxygen spherical copper powder

Method used

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  • Preparation method for superfine low-oxygen-content spherical copper powder
  • Preparation method for superfine low-oxygen-content spherical copper powder

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] Embodiment 1 Copper oxide powder prepares ultra-fine spherical copper powder with low oxygen content

[0021] First, buy coarse copper powder with a size of about 200 mesh as raw material. Put 1 gram of coarse copper powder into a tube furnace and let air in, oxidize at 550°C for 3 hours to obtain coarse copper oxide powder, and then crush it mechanically to 5μm-12μm. Combine copper oxide powder with graphite with a size of about 400nm Powder, according to the ratio of 1:1 by weight, mechanical stirring method to mix evenly.

[0022] Put the mixed copper oxide / graphite mixed powder into an alumina crucible, put the crucible into the heating zone of the annealing furnace, pass in hydrogen, the pressure is 0.02MPa, heat to 650°C, and keep it warm for 30 minutes. Then the heating zone of the annealing furnace is rapidly heated to 1150° C., and after 5 minutes of heat preservation, the crucible containing the copper / graphite mixed powder is pulled out of the heating zone t...

Embodiment 2

[0023] Embodiment 2 ultrafine copper powder prepares ultrafine spherical copper powder with low oxygen content

[0024] First, purchase ultra-fine metal copper powder with a size of about 3μm-10μm 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.

[0025] 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, then pass through 0.02MPa hydrogen, heat to 750°C, and keep the temperature for 30 minutes. Subsequently, the heating zone of the annealing furnace was rapidly heated to 1150° C., and after holding the heat for 5 minutes, the crucible containing the copper / graphene mixed powder was pulled out of the heating zone to cool.

[0026] The copper / graphene mixed powder is soaked in water, and the copper microspheres are obtained by ultrasonic cl...

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Abstract

The invention provides a preparation method for superfine low-oxygen-content spherical copper powder. The preparation method includes (1), preparing superfine copper oxide powder; (2), evenly mixing the superfine copper oxide powder or superfine pure copper powder with carbon material powder or ceramic material powder; (3), heating and reducing the mixed powder under a reducing atmosphere, and performing high-temperature heat treatment to enable copper to be melted, cooled and solidified into copper balls; (4), removing the carbon material powder or the ceramic material powder to obtain the superfine low-oxygen-content spherical copper powder. According to the preparation method, the characteristic that copper oxide powder is fragile is utilized, the superfine copper oxide powder is prepared firstly, and the superfine low-oxygen-content copper powder is prepared through reduction; the property of non-wetting, non-diffusion or less diffusion of copper drops on solid interfaces of carbon materials or ceramic materials is utilized, spherical copper drops are formed under the joint action of interface tension of solid liquid interface drops and surface tension of liquid, and the superfine low-oxygen-content copper balls are obtained after cooling.

Description

technical field [0001] The invention relates to a method for manufacturing copper spherical powder suitable for metal 3D printing, injection molding, conductive paste and other fields. Background technique [0002] Spherical copper powder can be used in metal 3D printing, injection molding, conductive paste and other fields. The existing preparation methods of copper spherical particles include: gas atomization method, centrifugal atomization method, water mist method, vacuum atomization method based on droplet jet solidification into balls; electrolysis method, physical evaporation condensation method. The atomization method is the method mainly used in the industry to prepare spherical copper powder, among which the gas atomization method and the centrifugal atomization method are more commonly used. The main principle is to atomize and pulverize copper liquid raw materials with high-speed airflow to form fine droplets, and form spherical particles through surface tension...

Claims

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Application Information

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IPC IPC(8): B22F9/22
Inventor 唐少龙程振之雷成龙黄海富都有为
Owner NANJING UNIV