Cobalt (strip, sheet, pig, ingot)
Cobalt is the 27th element of Mendeleyev’s periodic system. It is designated as Co (from Latin — Cobaltum). It is silvery metal with bluish, yellowish or pinkish tint, which appears because of surface oxide film.
Cobalt name came from German word «Kobold» that means cave-dwelling gnome. While annealing, cobalt mines that contain arsenic give off toxical volatile oxides AsO. Ancient Norwegians thought that frequent intoxications at silver smelting are the intrigues of mountain evil spirit. That is why they named this material like this. In 1735, Swedish chemist George Brandt managed to separate from mineral an unknown at that times material, which was named with trivial name, Chemist also found out that derivative products of this element give a blue color to glass. This property was used in times of ancient Babylon and Assyria.
Cobalt is hard metal that has two modifications: α — modification (resistant to a temperature of 427 °C, β-modification (cubic face-centred lattice — resistant at a temperature of 427 — 1120 °C). Cobalt is ferromagnet with Curie point of 1121 °C.
|Atomic (molal) weight mole/h||58.93|
|Oxidation rate||3, 2, 0, -1|
|Melting point is 1400°||1494°С|
|Melting heat kJ/mole||15.48|
|Heat conductivity K [V/m*K]||100|
|Evaporation heat kJ/mole||389.1|
— industrial chemistry (catalysis of chemical reactions);
— alloy that contains up to 50% of Co, chromium, and vanadium is used for permanent magnets;
— alloying with cobalt can increase alloy heat resistance and improve mechanical properties of steel by making it tool material (drill, cutters etc.)
— magnetic properties of cobalt alloys allow using them in transformer cores, electric motor, devices for magnetic recording;
— CoSi silicide is perfect thermoelectric material for thermoelectric generators with high coefficient of useful effect performance duty;
— radioactive 60 Со is used in medicine, gamma-ray flaw detection, for nuclear reactor filling;
— lithium cobalt is highly effective positive electrodes in manufacture of lithium accumulators.
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