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Tantalum is a rare, hard, blue-gray, lustrous transition metal that is highly corrosion resistant. It is part of the refractory metals group, which are widely used as minor component in alloys. The chemical inertness of tantalum makes it a valuable substance for laboratory equipment and a substitute for platinum, but its main use today is in tantalum capacitors in electronic equipment such as mobile phones, DVD players, video game systems and computers. Tantalum, always together with the chemically similar niobium, occurs in the minerals tantalite, columbite and coltan (a mix of columbite and tantalite).
| Weight % | Tantalum |
|---|---|
| Typical Composition | 100.00 |
| Characteristics | English | Metric | |
|---|---|---|---|
| Nominal density | 20°C / 68°F | 0.6015 lbs/in3 | 16.65 g/cm3 |
| Melting point | 5425 °F | 2996 °C | |
| Specific heat | 25 °C/ 77°F | 0.0366 BTU/lb – °F | 153 J/KG- °K |
| Average coefficient of
thermal expansion Linear |
20 °C/ 68°F | 3.61micro in/in- °F | 6.50 micro m/m- °K |
| 250 °C/ 482°F | 3.67 micro in/in- °F | 6.60 micro m/m- °K | |
| 500 °C/ 932°F | 3.72 micro in/in- °F | 6.70 micro m/m- °K | |
| 1000°C/1830°F | 3.87 micro in/in- °F | 6.96 micro m/m- °K | |
| Thermal conductivity | 20°C / 68°F | 31.5 BTU/ft- hr – °F | 54.4 W/m – °K |
| 127°C / 261°F | 34.6 BTU/ft- hr – °F | 59.9 W/m – °K | |
| 527°C / 981°F | 38.5 BTU/ft- hr – °F | 66.6 W/m – °K | |
| 927°C / 1700°F | 42.2 BTU/ft- hr – °F | 72.9 W/m – °K | |
| 1327°C/ 2421°F | 44.5 BTU/ft- hr – °F | 77.0 W/m – °K | |
| 1727°C/ 3141°F | 46.7 BTU/ft- hr – °F | 80.7 W/m – °K | |
| 2127°C/ 3861°F | 48.4 BTU/ft- hr – °F | 83.7 W/m – °K | |
| 2527°C/ 4581°F | 49.6 BTU/ft- hr – °F | 85.8 W/m – °K |
| Temper | Tensile | Hardness | Shear | |||||
|---|---|---|---|---|---|---|---|---|
| Ultimate | Elongation
at break |
Modulus of
Elasticity |
Hardness
Vickers |
Modulus | ||||
| KSI | MPa | % | KSI | GPa | KSI | GPa | ||
| Annealed | 65.3 | 450 | 15-25 | 68000 | 469 | 170 | 25500 | 176 |
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