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What is atomized powdered copper?
atomized Copper Powder can be further processed with electrolytic copper. It is a spherical or cylindrical powder that is irregularly packed in a light rose 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 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
Copper must be melted with impurities under strict control to achieve a powder that is fluid and has a high melting point.
In an intermediate frequency or electric arc 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.
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. It can be classified into air atomization or argon atomization depending on the gas medium. Supersonic Atomization is also used to get finer powder.
In practice, water atomization has proven to have a better effect than gas atomization.
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 the process of 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 these 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.
The surface of copper powder can easily absorb air vapor and 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. This results in a low oxygen concentration and little oxygen infiltration. 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 anti-oxidation 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 & manufacture with more than 12 years experience in providing super-high quality chemicals and Nanomaterials. Copper powder is produced by our company with high purity, fine particles and low impurity contents. If you need lower, please call us.