History of molybdenum. Physical and mechanical properties.
The name of this metal comes from the Greek word «ΜΌΛΥΒΔΟΣ", meaning lead. The discoverer of the molybdenum was the Swedish chemist Carl Scheele in 1778, but in the 11−13 centuries in Japan molybdenum forged edged weapons.
|The temperature of the receiving data characteristics of t°C||20°C|
|The linear thermal expansion coefficient α [1/°C]||4,9x10−6|
|The melting temperature t°C||2620°C|
|Specific heat (t° 20 °C) [kJ/(kg·deg)]||0,256|
|The thermal conductivity K [W/(m·K)]||142|
|Electrical resistivity R Омхмм2/m||0,054|
Molybdenum has excellent mechanical strength and corrosion resistance. Compared with tungsten — molybdenum wire is half the size, and therefore has a high specific strength (up to t° +1370°C).
The soluble molybdenum salt, the sulfuric acid (t° 80°C). Nitric acid, Aqua Regia dissolve it only after reaching 80 °C. the Admixtures of carbon, oxygen, silicon, aluminum, nitrogen, iron, sulphur, calcium, phosphorus significantly change its properties. The bulk of these impurities increases the fragility. Most harmful of all impurities is considered to be oxygen.
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