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1. Table of main properties of tantalum
| Property | Typical value | Remarks |
|---|---|---|
| Density | ~16.6 g/cm³ | Very high |
| Elasticity modulus (E) | ~185–190 GPa | High |
| Tensile strength | ~200–900 MPa | |
| Hardness (HV) | ~100–300 HV | Moderate |
| Thermal conductivity | ~55–60 W/m·K | Moderate |
| Electrical conductivity | ~7–8 MS/m | Low |
| Thermal expansion | ~6–7 ×10⁻⁶ /K | Low |
| Melting point | ~3017 °C | Very high |
| Magnetism | No | Non-magnetic |
| Corrosion resistance | Excellent | |
| Machinability | Difficult |
2. General description
Tantalum is a rare transition metal, used sparingly in watchmaking for its exceptional properties of corrosion resistance, high density, and non-magnetic character. Its naturally dark bluish-gray hue and matte appearance give it a distinctive aesthetic identity, particularly appreciated in certain high-end watchmaking creations.
Despite its qualities, its use remains anecdotal due to the difficulty of machining and its complex implementation, which require specific tools and advanced expertise.
3. Specific characteristics
Tantalum is known for:
- Its machining difficulty (material that is “sticky” to the tool)
- Its tendency to work-harden during deformation
- Its sensitivity to cutting conditions
- Its resistance to plastic deformation
These constraints explain its limited use in industrial production.
4. Treatments and finishes
Tantalum is generally used without surface treatment, in order to preserve:
- Its natural bluish-grey tone
- Its slightly matte appearance
Possible finishes:
Tantalum is very difficult to polish, and the result obtained is rarely of good quality, which is why the two finishes mentioned above are generally preferred instead.
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