OXIDATION OF NIOBIUM (in Spanish)
Journal Article
·
· Inst. hierro y acero
OSTI ID:4819459
By means of semicontinuous gravimetric and volumetric measurements, determinations were made of the reaction rate for oxidation of niobium as a function of time at 150 to 1000 deg C, and for the majority of temperatures, at oxygen pressures of 760 to 10/sup -2/ mm Hg. Following these measurements, investigations were carried out in oxidized samples using x-ray diffraction, electron diffraction, electron microscopy, and metallographic techniques. Various x-ray diffraction measurements were realized directly on samples yielded in the oxidation. It was observed that nlobium reacts with oxygen in sufficiently complex and little known ways, although, to appearances, a narrow correlation exists between the oxidation rate curves and the oxidation products formed. A study is shown of this which clariflis the effects of temperature, oxygen pressure, and time on the oxidation behavior of niobium. It is necessary to mention that the oxidation is considerable at 200 to 250 deg C; that the dissolution of oxygen inside the metallic niobium system played an essential part during the initial stage of oxidation; that two different suboxides, NbO/sub x/ and NbO/sub y/, were discovered in the oxidation products, in addition to the well-known oxides, NbO, NbO/sub 2/, and Nb/sub 2/O/sub 5/; and that, on the upper surface of the oxide, an oxidized coating appears at 800 to 1000 deg C. (tr-auth)
- Research Organization:
- Instituto Central de Investigacion Industrial, Oslo
- NSA Number:
- NSA-16-001745
- OSTI ID:
- 4819459
- Journal Information:
- Inst. hierro y acero, Journal Name: Inst. hierro y acero Vol. Vol: 13
- Country of Publication:
- Country unknown/Code not available
- Language:
- Spanish
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