The metal molybdenum
Technical characteristics of molybdenum
The metal molybdenum is widely known as one of the alloying elements, have the property to increase the strength of steel and resistance to corrosion. It is quite technologically advanced, which greatly simplifies the work with him. However, there is one drawback — when doping increases not only the strength but also fragility. Japanese masters have long used this metal for the manufacture of bladed weapons, and also as an ingredient in alloying, corrosion-resistant, heat-resistant alloys. The refractory metal molybdenum properties similar to tungsten. The melting point of molybdenum reaches more than 2600 °C, boiling point of more than 4600 °C, Brinell hardness number — 125 N. Century Relative to the alloys of molybdenum, their main advantages are:
·excellent heat resistance;
·good heat resistance;
·corrosion resistance (especially in acid environments);
·high values of specific strength.
Like other refractory metals, molybdenum is characterized by its low ductility at low temperatures, this can be attributed to the shortcomings of the material.
Physical quality Mo
|The linear thermal expansion coefficient α [1/°C]||Of 4.9×10−6|
|The melting temperature t°C||2620°C|
|Specific heat at 20 °C [kJ/(ggrad)]||0,256|
|The thermal conductivity K [W/(MK)]||142|
|Electrical resistivity R Омхмм2/m||0,054|
The application of molybdenum
The production elements heating high temperature vacuum furnace, heat shields, heat guns. Such products as wire or tape, is used in parts of furnaces operating at very high temperatures, and is used as the I / o path of the current in the lamps. The alloys of molybdenum have high rates of elasticity, low coefficient of expansion, resistance to extremes temperatures (called thermal shock) and a small capture cross section for thermal neutrons. Molybdenum has a conductivity of electric current slightly worse than copper, but better than iron. On the strength of this material is slightly inferior to tungsten, but is much easier to handle. Strength and refractoriness allows him to significantly improve the performance of alloys in which it is present.
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