With a melting point of around 2600 ° C, molybdenum is a slightly lower melting metal than tungsten. However, its properties are very similar. The sintered material is practically not cold-formable and brittle at normal temperature.
At temperatures between 1000 and 1600 ° C, the semi-finished products are given their basic shape by forging, round hammers, rollers or extrusion. Subsequent grinding of the surface enables workpieces with very tight tolerances to be produced.
Molybdenum is resistant to most acids, alkalis and non-metals. (Prerequisite: air humidity <60%; the respective application must be considered separately). Molybdenum is not stable in oxygen-releasing and in alkaline liquids at temperatures above 100 ° C. Molybdenum is very resistant to hydrogen, nitrogen, noble gases, glass and molten metals - even at very high temperatures. Alloying with other high-melting metals can further improve the corrosion behavior towards certain media.
Compared to tungsten, molybdenum is easily deformable and easier to process even at low temperatures. The brittle-ductile temperature during forming must be taken into account - the thicker the material, the higher the heating temperature. Above the brittle-ductile temperature, molybdenum loses its brittleness - it can be reliably deformed without cracks. Cutting, punching and machining are also possible with the correct heating temperature.
The main properties of molybdenum
high melting point of 2620 ° C (2893K)
low vapor pressure
high modulus of elasticity
extremely high heat resistance and creep resistance
high thermal conductivity
low coefficient of expansion
excellent corrosion resistance
Areas of application
Stirrers in glass and metal melts
Carrier for power electronics in semiconductor technology
Components, heating inserts in annealing furnaces, sintering plants
Thermal protection tubes
Power supplies in incandescent lamps
Anti-dazzle caps in automotive lights
Components in chem. Industry