MOLYBDENUM

Data sheet:

Composition
Mo 99,95 % min

Melting point
2620 °C

Density
10,2 g/cm3

Compressive strength
590-780 MPa

Hardness
200-360 HV10

Enervation
0,2% 520-620 Mpa

Elasticity
4-18%

Thermal conductivity
a 20°C      142 w/m°C
a 1000°C  105 w/m°C
a 1500°C    88 w/m°C

Molybdenum is a metal with a melting temperature of 2620°C. It is mainly used in applications that utilize its exceptional stability at high temperatures that can reach 1900°C.

Molybdenum however starts recrystallizing between 800 and 1200°C depending on the degree of thermomechanical deformation during the product processing (rolling, forging, swaging etc.).

The recrystallization at high temperatures produces a reduction of its mechanical properties such as UTS, hardness and toughness. This reduction of the properties of pure Molybdenum can be reduced by small additions of elements such as Zirconium, Titanium, Boron and rare earth which increase the recrystallization temperatures and therefore the mechanical properties of such Molybdenum alloys.

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Molibdenum alloys

TZM ALLOY

Data sheet:

Composition
Mo 99,3% – Ti 0,5% – Zr 0,08%

Melting point
2620 °C

Density
10,15 g/cm3

Compressive strength*
590-790 MPa

Hardness*
200-320 DPH10

Enervation*
0,2% 515 – 690 MPa

Elongation*
5-18%

Thermal conductivity
a 20°C      126 w/m°C
a 1000°C   98 w/m°C
a 1500°C    86 w/m°C

Coefficient of expansion
a 20°C      5,3 m/m°C
a 1000°C   5,8 m/m°C
a 1500°C    6,5 m/m°C

 

(*)The values may vary depending on the diameter

Probably the most important Molybdenum alloy is TZM which contains small amounts of Titanium and Zirconium. This Molybdenum alloy because of its higher mechanical properties is used in the production of structural parts, which work at high temperatures. In these applications often the users take advantage also of the better weldability of TZM with respect to pure Molybdenum.

APPLICATIONS OF MOLYBDENUM AND ITS ALLOYS
Because of its good electrical properties Molybdenum and its alloys is often used in electronic tubes and in the production of anodes or cathode supports.
For its elevated temperature strength and its good thermal conductivity, TZM is used for the production of inserts for Aluminum and Brass casting dies to protect the dies against the erosion of the liquid metal.
TZM dies are used in the extrusion of Copper alloys.
Molybdenum is widely used for the production of electrodes for glass melting furnaces
An alloy 70%Mo-30%W is used to produce pump shafts and thermocouple protection tubes for application in the very corrosive pure liquid Zinc.