Zinc powder is a versatile product with many applications. In pyrotechnics, it is used to produce a blue flame. When zinc itself is obtained by the hydrometallurgical method, zinc powder (zinc dust) is used to purify zinc sulfate from cadmium and copper. But the scope of the product does not end there. Not everyone thinks about why a factory floor span, a metal bridge and other large-sized metal structures are most often painted gray? This is explained by the fact that zinc powder is most often present in the composition of this gray paint, which, when mixed with zinc oxide and linseed oil, turns into paint, the main function of which is to protect against corrosion. In addition to the fact that paint based on zinc powder is plastic, has good adhesion, does not flake off when the temperature rises, it has a low cost. Such an unsightly "machine" color can be considered an advantage rather than a disadvantage. Structures covered with this paint are not stamps. Powder from zinc is used in the extraction of precious and rare metals. Thus, with the help of zinc, silver and gold are displaced from cyanide solutions.
Copper powder (copper powder) is a finely dispersed powdery substance produced by spraying a stream of molten copper perpendicular to a stream of gas, water or air. The use of copper powder is possible in many industries: in metallurgy, machine and aircraft construction, electrical engineering, etc.
The production of copper powder by the evaporation method consists in transferring copper into the gas phase with the further organization of the condensation process steam, during which, at the molecular and atomic level, a powder is formed with controlled characteristics: chemical, phase, structural and particle size.
This method of obtaining ultrafine copper powder is associated with the creation of a vacuum-arc discharge using a copper cathode, as well as melting of the cathode metal, evaporation of the metal, and condensation of the evaporated metal on the cooled substrate. Metal evaporation is performed at the cathode temperature, which corresponds to the transition boundary of the vacuum-arc discharge. In this case, the temperature of the cathode spot is provided by modulating the discharge current of a pulsed power supply, which is connected to the cathode and has an inductive decoupling. All this makes it possible to obtain a high-quality, without the presence of an oxide film, ultrafine powder of a given size.
