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niobium bar


Niobium does not react with noble gases. With increasing temperature, niobium reacts strongly with airborne oxygen, nitrogen and hydrogen. Oxygen and nitrogen can be removed again by annealing the material in a high vacuum at temperatures above 1 700 °C. Hydrogen is removed at lower temperatures of approximately 800 °C.

Niobium is resistant to a range of metal melts provided that these melts have a low oxygen content. Al, Fe, Be, Ni, Co as well as Zn and Sn all affect niobium

Please note that niobium may react with construction parts made from refractory oxides or graphite. Even very stable oxides such as aluminium, magnesium or zirconium oxide may be reduced at high temperatures when in contact with niobium. The limit temperatures listed in the table below apply in a vacuum. If you use a protective gas, the values are between 100 °C and 200 °C lo.wer.

It is possible to regenerate niobium that has become brittle due to the presence of hydrogen by means of high-vacuum annealing at 800 °C

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