| All data is for information only------(Home) | |
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| PRODUCT DATA of Tantalum |
| Material | Tantalum |
| General Information | Tantalum 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 Composition | 100Ta |
| CAS Registry ID | 7440-25-7 |
| EXPERIENCE IN PRACTICE |
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| Equivalent Designations | Ta |
| PHYSICAL PROPERTIES |
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| Atomic Number | 73 |
| Atomic Weight | 181 amu |
| Work Function | 4.1 eV |
| Crystal Structure | Body centered cubic (bcc) |
| Specific Gravity | 16.6 |
| ELASTIC PROPERTIES |
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| Tensile Modulus | 186 GPa |
| Shear Modulus | 69 GPa |
| Bulk Modulus | 200 GPa |
| Poisson Ratio | 0.35 |
| Speed of Sound (longitudinal) | 4100 m/s |
| Speed of Sound (transverse) | 2900 m/s |
| Acoustic Impedance | 54.8 MRayls |
| ELECTRICAL PROPERTIES |
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| Electrical Volume Resistivity | 1.24e-7 ohm.m |
| Superconductivity Critical Temperature | -269 °C |
| THERMAL PROPERTIES |
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| Thermal Conductivity | 58.6 W/m.K |
| Thermal Expansion Coefficient | 6.5 μstrain/°C |
| Specific Heat | 0.142 J/g.K |
| Melting Range | 3000 °C |
| OPTICAL PROPERTIES |
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| Refractive Index | 2.05 |
| RELEVANT PROPERTIES FOR USE IN SPACE COMMUNITY |
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| Atmospheric Corrosion | Tantalum oxidises in air above 300C |
| EMF vs SCE | 0.04 V Remark: Measured in 3.5% NaCl solution Data Quality: Design Data |
| Machinability | Similar to cold rolled steel |
| Welding | conventional welding techniques wherein air is excluded |
| Brazing | Can be brazed with copper in vacuum |