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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 shaped, rose red, and dendritic. 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. Widely used by powder metallurgy and friction products. Also, in electrical carbon products, chemical contact products, diamond products, electrical alloys, and other industries. Copper powder in spherical or spherical form has 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 electric arc heater or intermediate frequency oven, the normal operating temperature is 1150-1200degC. Before the atomization, the most important step is smelting. 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 is identical. Depending on the gas medium, air atomization or argon can be used. It is also possible to use supersonic ultrasonic atomization for finer powder.
In practice, water atomization has proven to have a better effect than gas atomization.
Reduction
The reduction is a relatively straightforward process. The temperature ranges from 400 to 600 degrees and the time period is 60 to 120 minutes. During atomization, a part of the oxygen is converted to copper oxide on the surface. The other part penetrates inside the particles. For oxygen to be removed, a high reduction temperature is required. This temperature will cause copper to naturally sinter, requiring the grinding of 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. 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 result of this. 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.
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