Molybdenum wire filament
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Molybdenum wire has a very high heat resistance and mechanical strength. The melting point of molybdenum 2620 °C refractoriness, it is second only to tungsten, rhenium, osmium, iridiu. Molybdenum wire retains its strength at temperatures up to 2000 °C. To 1370 °with its relative thermal strength is higher than that of tungsten. Molybdenum is characterized by minimum thermal expansion coefficient, high elastic modulus, excellent corrosion resistance, allowing it to be used in the most demanding conditions, including in aggressive environment.
The disadvantage is the high production cost of molybdenum wire. Because of the significant hardness and refractoriness molybdenum difficult technological processing. Production it time-consuming, and obtaining it in its pure form is quite difficult. Under normal conditions, it is rigid and not very technological material.
Some brands supply a wire made of molybdenum:
|Products||Mark||Basis %||AVG. the content of impurities. and landings %, not more|
|wire:||MCH||Mo DOS.||Al+Fe 0,018. Fe-0,009. Ca+Mg Is 0.005. Ni-0,005. Si-0,014. C is 0.005.|
|wire for light sources GOST 27266−87||MCH||Mo of 99.96||Sum of impurities of 0.04.|
|rod:||MCIT||Mo DOS.||At the stat. K-0,0100. Sa+MD-0,0030.Al+Fe-0,014. Ni-0,0030. Si-0,003. W-of 0.2000. C-0,300. O-0,1000. N-0,0030. H-0,0005.|
According to the requirements of GOST, the surface of the molybdenum wire must not be contaminated with traces of oxides or grease. Molybdenum wire cross-section up to 0.4 mm — dark gray, and a larger cross-section has a lighter shade. The wire should have a smooth surface, without delamination or other such defects. Wire cross-section more than 0.5 mm may have a deviation in size within limits.
Molybdenum electrode with a special coating demand for welding heat-resistant and alloyed steels. Easier molybdenum and tungsten, although inferior in heat resistance, exhibit a higher specific strength up to t°to 1370 °C in comparison with alloys of tungsten and tantalum. The molybdenum thin wire filament used in electric lighting devices along with the tungsten filament. In modern electrical engineering relevant molybdenum cathodes, grids, springs, loop heaters electronic devices, springs of semiconductor devices. The thermal expansion coefficient of molybdenum and glass are identical, so Mo is widely used for sealed in glass switch contacts.
Supply of wire made of molybdenum, and its basic properties
|Specification||The main properties|
|Diameter, mm||Length, mm||Density, g/cm2||Hardness, HB||Resistivity, Ω *cm|
|3−110||≤ 1000||≥ 9,6||≥ 120||6.63*10-6|
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The high demand for molybdenum wire is determined by the optimal combination of price and quality. A wide product range and convenient method of ordering will make a purchase from us as comfortable as possible. Full conformity with requirements of normative documentation and presence of quality certificates for every batch of products ensures long-term reliable performance of the ordered materials. Invariably high quality semi-finished products determines the constant trust of our customers.