OXIDATION OF NIOBIUM (COLUMBIUM) IN THE TEMPERATURE RANGE 500 TO 1200 C
Journal Article
·
· Trans. Met. Soc. AIME
OSTI ID:4017940
The oxidation behavior of niobium was studied in the temperature range 500 deg to 1200 deg C and at oxygen pressures of 760, 100, 10, 1, and 0.1 mm of Hg. The work comprises kinetic studies of the oxidation as well as structural investigations of the oxidized specimens by means of x-ray diffraction, electron diffraction, electron microscopy, and metallographic techniques. The oxidation reaction has a highly irregular temperature dependence and is unusually sensitive to changes in the oxygen pressure. The complex oxidation behavior is suggested to be due to formation of different Nb/sub 2/O/sub 5/ modifications in different temperature regions. During oxidation oxygen is also dissolved in the metal. Formation of oxide whiskers take place on the oxide surface at temperatures above approximately 800 deg C. (auth)
- Research Organization:
- Central Inst. for Industrial Research, Blindern-Oslo, Norway
- NSA Number:
- NSA-15-017264
- OSTI ID:
- 4017940
- Journal Information:
- Trans. Met. Soc. AIME, Journal Name: Trans. Met. Soc. AIME Vol. Vol: 221
- Country of Publication:
- Country unknown/Code not available
- Language:
- English
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