The combination of physical, mechanical and chemical properties high pure aluminum determines its wide use practically in all fields of technology, especially in the form of its alloys with other metals.
In electrical engineering, pure aluminum successfully replaces copper, especially in the production of massive conductors, such as overhead lines, high-voltage cables, transformers. The electrical conductivity of high pure aluminum reaches 65.5% of the electrical conductivity of copper and it is more than three times lighter than copper. High pure aluminum is used in the manufacture of electrical capacitors, rectifiers, which action is based on the ability of oxide film of ultra-pure aluminum to pass electrical current to pass electrical current only in one direction. Ultra pure aluminum, purified by zone melting, is used for the synthesis of semiconducting compounds of type AIIIBV, used for manufacturing semiconductor devices.
High pure aluminum is used in the production of various kinds of mirror reflectors. High pure aluminum is used as a structural material in nuclear reactors. High-purity aluminum is used to protect metal surfaces from the action of atmospheric corrosion (cladding, aluminum paint).
Alloys, based on pure aluminum, are used in rocket technology in aircraft, automotive, shipbuilding and instrument in the manufacture of cookware and many other industries. In breadth of application pure aluminum alloys occupy the second place after the steel and cast iron.
Pure aluminum is also used as an additive to many alloys. It is used to impart them heat resistance. The high thermal conductivity combined with more than satisfactory chemical stability have made aluminum a promising material for heat exchangers and other apparatus of chemical industry, domestic refrigerators, radiators cars and tractors. Small neutron capture made aluminum one of the most important metals of atomic technology.
In recent years, super purity aluminum, as well as ultra pure aluminum, is widely used mainly in electronics — from electrolytic capacitors to the top of Electronic Engineering – microprocessors; in сryoelectronics.