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Molybdenum thread

Molybdenum thread

Dignity

Molybdenum thread has unique properties. It is resistant to aggressive environments, withstands vacuum high temperature up to 1800 °C. Molybdenum filament compared with tungsten easier almost doubled, so molybdenum products have high specific strength (at a temperature of not more than 1370 °C).

Disadvantages

Practically the only disadvantage is the high cost of such yarns, since molybdenum is a metal belonging to rare earth elements and in its pure form is quite difficult to identify. Besides, he is refractory and hard to work.

Chemical properties

Molybdenum reacts with hydrochloric, sulfuric acids only at the temperature. 80−100°C. Nitric acid, Aqua Regia dissolved molybdenum only when температуре100°C. In cold alkaline solutions it is stable, but in hot alkaline solutions the molybdenum slowly being destroyed. Impurities of carbon, oxygen, silicon, aluminum, nitrogen, iron, sulfur and calcium, phosphorus, contained in the technical molybdenum in hundredths or thousandth fractions of a percent, significantly affect the properties of molybdenum. The bulk of these impurities makes molybdenum more fragile. Most harmful of all impurities is oxygen. If it is contained in a volume 0,0008−0,004%, the low-melting oxides can lead to a sharp increase in its brittleness and a decrease in properties to plastic deformation, especially in the simultaneous presence of carbon with nitrogen. With increasing percentage of oxygen than 0.015% molybdenum is not handled the pressure and becomes brittle.

Physical quality
The temperature at which the obtained data the features of t°C 20°C
The linear thermal expansion coefficient α [1/°C] Of 4.9x10-6
Density [g/cm3] 10,2
The melting temperature t°C 2620°C
Specific heat at 20 °C [kJ/(kg·deg)] 0,256
The thermal conductivity K [W/(m·K)] 142
Electrical resistivity R, Mhmm2/m 0,054

Manufacturer

First, rolling in a rotary swaging machine hot billet, are made of molybdenum wire of diameter from 1 to 10 mm. After that, with the help of drawing wire is pulled into a thin thread. It is sometimes produced from pure molybdenum MCH, MCIT, or with the addition of chromium, cobalt. In this case, the workability, the strength of the fiber increases. From one kilogram of molybdenum rolled thread length of about 3 km.

True annealing temperature, ° C Diameter molybdenum filament
1500−1550 200 — 800 µm
1450−1500 801 — 1000 µm
1400−1450 1001 — 1250 µm
1300−1350 1251 — 2500 µm

Use

Molybdenum filament, and tungsten is used in lighting devices. Depending on the condition and diameter of the surface is made respiratoorse and spiral cathodes, springs, nets, springs of semiconductor devices, loop heaters electronic devices. Also made traverses, glands and parts of the instrument, without the use of doped molybdenum.

Buy at best price

A huge range of molybdenum rolled stock LLC «AVEK global» can satisfy any customer. Absolute compliance with all technological norms of production ensures the quality of the finished product. Deadlines all orders the shortest possible. For any questions, experienced managers will give a full detailed advice. Carrying out wholesale orders, you can count on company-provided flexible system of discounts.