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What is atomized powdered copper?
The atomized powder will be further processed with electrolytic copper. It is a spherical, irregularly-packed, light rose-red powder. It is easily oxidized in humid air. It can also be dissolved in hot sulfuric and nitric acids. Low bulk density. Good formability. Long storage time. Uses include powder metallurgy and friction materials. Copper powders in spherical or spherical form have a very high bulk 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 intermediate frequency furnace, or electric arc heater, 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 the atomizing medium. However, the principle of powder production is the exact same. According to the gas media used, air atomization or argon can be divided. Supersonic Atomization is also used to get finer powder.
In practice, water atomization has proven to have a better effect than gas atomization.
Reduction
The reduction process involves a relatively simple reduction. Generally, the temperature ranges from 400 to 600 degrees and the time period is between 60 and 120 minutes. During atomization, a part of the oxygen oxidizes on the surface while the rest turns into copper oxide. This copper oxide then penetrates inside the particles. For oxygen to be removed, a high reduction temperature is required. This temperature will cause copper to naturally sinter, which means that large blocks of sintered copper must be ground. 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. The thick film of water that is formed on the surface particles prevents oxygen from entering the space between the particles. Oxygen concentration is also low due to this. Copper powder is a poor concentrate as a consequence. The battery effect causes the copper powder to gradually oxidize. The surface of copper powder, after being treated by antioxidants, is adsorbent and covered with film. This produces an antioxidation 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 global chemical materials supplier & producer with more than 12 years experience, is a trusted source for 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.