BaoJi Fitow Metal Co., LTD
Tel : 8613909176258
Email: sales@fitowmetal.com
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Tantalum Metals
Tantalum Metals,
Tantalum belongs to the group of refractory metals. Refractory metals have a higher melting point than platinum (1 772 °C). The energy binding the individual atoms together is particularly high. The high melting point of refractory metals is coupled with a low vapor pressure. Refractory metals are also characterized by a high density and low thermal coefficient of expansion.
In the periodic table, tantalum is located in the same period as tungsten. Like tungsten, tantalum has a very high density of 16.6 g/cm3. However, unlike tungsten, tantalum becomes brittle during manufacturing processes involving hydrogen atmospheres. The material is therefore produced in a high vacuum.
Tantalum is without doubt the most resistant of the refractory metals. It is resistant to all acids and bases and possesses a very special range of properties:
|
Properties |
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Atomic number |
73 |
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Atomic mass |
180.95 |
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Melting point |
2 996 °C / 3 269 K |
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Boiling point |
6 100 °C / 6 373 K |
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Atomic volume |
1.80 · 10-29 [m3] |
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Vapor pressure |
at 1 800 °C |
5 · 10-8 [Pa] |
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at 2 200 °C |
7 · 10-5 [Pa] |
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Density at 20 °C |
16.60 [g/cm3] |
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Crystal structure |
body-centred cubic |
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Lattice constant |
3.303 · 10-10 [m] |
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Hardness at 20 °C |
deformed |
120 - 220 [HV10] |
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recrystallized |
80 - 125 [HV10] |
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Modulus of elasticity 20 °C |
186 [GPa] |
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Poisson number |
0.35 |
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Coefficient of linear thermal expansion at 20 °C |
6.4 · 10-6 [m/(m·K)] |
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Thermal conductivity at 20 °C |
54 [W/(m·K)] |
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Specific heat at 20 °C |
0.14 [J/(g·K)] |
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Electrical conductivity at 20 °C |
8 · 10-6 [1/(Ω·m)] |
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Specific electrical resistance at 20 °C |
0.13 [(Ω·mm2)/m] |
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|
Sound speed at 20 °C |
Longitudinal wave |
4 100 [m/s] |
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Transverse wave |
2 900 [m/s] |
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|
Electron work function |
4.3 [eV] |
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Capture cross-section for thermal neutrons |
2.13 · 10-27 [m2] |
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Recrystallization temperature (annealing time: 1 hour) |
900 - 1 450 °C |
|
|
Superconductive (transition temperature) |
< -268.65 °C / < 4.5 K |
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