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PRODUCT DATA of Tantalum
MaterialTantalum
General InformationTantalum is extremely corrosion resistant due to the formation of an oxide film, and is also resistant to acid attack (with the exception of HF). It will react with fused alkalis and a variety of non-metals at elevated temperatures.
Chemical Composition100Ta
CAS Registry ID7440-25-7
EXPERIENCE IN PRACTICE
Equivalent DesignationsTa
PHYSICAL PROPERTIES
Atomic Number73
Atomic Weight181 amu
Work Function4.1 eV
Crystal StructureBody centered cubic (bcc)
Specific Gravity16.6
ELASTIC PROPERTIES
Tensile Modulus186 GPa
Shear Modulus69 GPa
Bulk Modulus200 GPa
Poisson Ratio0.35
Speed of Sound (longitudinal)4100 m/s
Speed of Sound (transverse)2900 m/s
Acoustic Impedance54.8 MRayls
ELECTRICAL PROPERTIES
Electrical Volume Resistivity1.24e-7 ohm.m
Superconductivity Critical Temperature-269 °C
THERMAL PROPERTIES
Thermal Conductivity58.6 W/m.K
Thermal Expansion Coefficient6.5 μstrain/°C
Melting Range3000 °C
Specific Heat0.142 J/g.K
OPTICAL PROPERTIES
Refractive Index2.05
RELEVANT PROPERTIES FOR USE IN SPACE COMMUNITY
Atmospheric CorrosionTantalum oxidises in air above 300C
EMF vs SCE0.04 V
Remark: Measured in 3.5% NaCl solution
Data Quality: Design Data
MachinabilitySimilar to cold rolled steel
Weldingconventional welding techniques wherein air is excluded
BrazingCan be brazed with copper in vacuum