Tantalum crucibles are highly heat‑resistant due to tantalum's properties as a refractory metal:
|
|
|
|
|
3017 °C (5463 °F) – 5th highest of all metals
|
|
Max continuous use temperature (vacuum/inert)
|
|
|
Max short‑term use (vacuum/inert)
|
Up to ~2500 °C (depends on application & atmosphere)
|
|
Oxidation behavior in air
|
Forms Ta₂O₅; rapid oxidation above ~300–400 °C limits use in air
|
|
|
~57 W/(m·K) – good heat transfer
|
|
|
Retains mechanical strength better than steel at elevated temperatures
|
|
|
Excellent resistance to most acids (except HF and hot concentrated mixed acids)
|
Heat‑resistance summary:
In vacuum or inert gas, tantalum crucibles withstand prolonged heating close to 2000 °C with minimal degradation.
In air, usable temperature is much lower (~300–400 °C) due to oxide scale formation, which can become thick and brittle.
Thermal shock resistance is moderate; sudden large temperature changes can crack the crucible.
Key advantage: Combines very high melting point with strong corrosion resistance, making it ideal for specialized high‑temperature melts in controlled atmospheres.
(Both questions ask the same thing - answered together.)
|
|
|
|
In vacuum or inert gas (ideal)
|
~2000 °C continuous, short‑term up to ~2500 °C
|
|
|
~300–400 °C (oxidation limits practical use)
|
|
Molten metal compatibility
|
Must be above melt temperature but below 2000 °C in inert/vacuum; e.g., for melting certain reactive metals, specialty alloys, or performing high‑T experiments
|
Atmosphere is critical: Tantalum's oxidation resistance protects it temporarily, but above ~400 °C in air, oxide layer thickens, leading to loss of ductility and eventual failure.
Thermal cycling: Repeated heating/cooling in vacuum extends life; in air, repeated oxidation cycles cause spalling of oxide scale.
Chemical compatibility: Avoid melts containing fluorine, strong alkalis at high T, or species that attack Ta₂O₅ layer.
Comparison with other refractory crucibles:
|
|
|
|
|
|
|
|
|
|
|
~600 °C (limited by oxidation)
|
|
|
|
|
|
|
|
|
|
|
|
|
Takeaway
Maximum temperature for a tantalum crucible is about 2000 °C for continuous use in vacuum or inert gas.
In air, limit is only 300–400 °C due to rapid oxidation.
Tantalum crucibles are chosen for their combination of ultra‑high melting point, corrosion resistance, and stability in controlled atmospheres, despite air limitations.
Visit https://www.zhenanmetal.com to learn more about the product. If you would like to know more about the product price or are interested in purchasing, please send an email to info@zaferroalloy.com. We will get back to you as soon as we see your message.
Get a Quote Today
