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What is atomized powdered copper?
The atomized Copper powder can be further processed with electrolytic copper. It is a spherical or cylindrical powder that is irregularly packaged, light rose-red, dendritic and has a rose red color. It is easily oxidized in humid air. It can also be dissolved in hot sulfuric and nitric acid. Low bulk density. Good formability. Long storage time. Uses: Used in a wide range of industries, including powder metallurgy and friction materials. Copper powder spherical or spherical has a very high density. It is widely applied in industries such as injection molding and welding materials.
Atomized copper powder manufacturing process
Electrolytic copper plate-smelting-water (gas) atomization-vacuum drying-high temperature oxidation-crushing-reduction-crushing-classification
Smelt
Copper must be melted with impurities under strict control to achieve a powder that is fluid and has a high melting point.
Conductivity.
In an electric arc heater or intermediate frequency oven, the normal operating temperature is 1150-1200degC. Before the atomization, the smelting step is of paramount importance. Copper smelting is controlled to reduce the density of the powder.
Atomization
The industrial production of copper powder can be divided into two types, namely the gas atomization technique and the water atomization technique. The only difference between the two is that they use different atomizing agents, although the principle of powder production is the exact same. According to different gas medium, it can also be divided into air and argon. For finer powder, supersonic-atomization is also used.
In practice, water atomization has proven to have a better effect than gas atomization.
Reduction
The reduction process involves a relatively simple reduction. The reduction temperature ranges from 400 to 600 degrees Celsius, with a time of 60 to 120 minutes. During atomization, a part of the oxygen oxidizes on the surface while the other becomes copper oxide which penetrates inside the particles. For oxygen to be removed, a high reduction temperature is required. This temperature will cause copper to naturally sinter, which is why it’s necessary to grind large quantities of sintered blocks. This new water mist method eliminates the need for the reduction stage, which saves energy and speeds up the process.
Antioxidant treatment
The surface of the powdered copper can absorb water vapour in the atmosphere to form a thin water film. A thick film of water is formed on the surface, preventing oxygen from entering the pores. Oxygen concentration is therefore low. Copper powder is a poor concentrate as a consequence. The copper powder slowly oxidizes because of the battery effect. After being treated by antioxidants, copper powder’s surface is adsorbent and covered with film. This produces an antioxidation effect, and can prolong the service life. Benzotriazole(BTA), gelatin, and the protein hydrolyzate are all good corrosion inhibitors for water atomized Copper powder.
(aka. Technology Co. Ltd., a trusted global chemical materials supplier and manufacturer with more than 12 years experience in providing super-high quality chemicals and Nanomaterials. The Copper powder that we produce is of high purity with a fine particle size. If you need lower, please call us.