Vanadium powder. Brand chemical composition.
Vanadium is an element of the fifth side group of the periodic system of elements. Plastic is a steel-gray metal with no content of impurities, nitrides and carbides. Possesses chemical activity, which is due to the condition of this item and finished 18-electron shell. Has the ability to easily stretch the wire, and at normal temperature can be rolled into thin foil. The mixture of nitrides or carbides increases hardness and brittleness. The powder of vanadium — gray color.
|Physical properties V|
|Atomic (molar) mass, g/mol||50,9415|
|Oxidation||5, 4, 3, 2, 0|
|The melting temperature t°C||1920°C|
|The heat of fusion kJ/mol||17,5|
|The thermal conductivity K [W/(m·K)]||30,7|
|Heat of evaporation kJ/mol||480|
Compact metal at ordinary temperatures remains even in the humid air brilliant. When heated in the air vanadium powder changes color, becomes covered with oxides of different oxidation States, can be actively connected with chlorine, oxygen and sulfur, and can also dissolve up to 42% hydrogen. Burning, the powder is converted to V2 O5. The powder of vanadium in the heating process in nitrogen begins to form nitrides VN, VN2, V3 N, and with excess of chlorine forms the tetrachloride. Metal vanadium has resistance to various reagents. In addition to HF, it dissolves only in acids that constitute strong oxidizing agents: HN03, Aqua Regia. This metal does not act in alkaline solutions, but molten alkali is dissolved. Solid carbonaceous reducing agents and carbon-containing gases during heating to form a carbide is VC.
In the atmosphere of hydrogen the metal forms a vanadium hydride as vanadium, after which is dehydrogenated and ground. In this case, the metal is heated first in a vacuum to a temperature of 200°- 300 °C and in atmosphere of N2 that is generated after thermal decomposition titanium hydride conversion in the unsaturated state. Activated compact vanadium at temperatures of 600° — 800 °C, and the hydrogenation occurs at a temperature above 50° and 200 °C. During the grinding of vanadium hydride to a fine powder, the dehydrogenation is carried out at t° 650°-800°C with holding it up to a residual pressure of 0.05 — 0.5 mm. Hg. post and the unsaturated absorption of the eye-catching titanium hydride. This method is intended to produce high-purity vanadium powder metal compact. It is produced on a specially designed rig, which consists of roughing pump, retort heat-resistant steels of the highway for evacuation and transportation of hydrogen with shut-off components as well as of instrumentation and electric stoves designed for heating the retorts.
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