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OXIDATION OF URANIUM IN MOIST GASES (thesis)

Technical Report ·
DOI:https://doi.org/10.2172/4096625· OSTI ID:4096625
The kinetic study of low temperature oxidation of uranium in moist environment was conducted by means of system pressure measurement and gas chromatographic analysis of environmental gases. A mechanism including intermediate hydride phase formation at the metal-oxide interface was proposed. Principal conclusions are: 1) Moisture is principally responsible for the oxidation of uranium under these test conditions. 2) The reaction rate is principally dependent linearly on time; however logarithmic dependency and subsequent exponential time dependency, V = k t/sup 1.5/, are observed in the very early stage of oxidation. 3) Oxygen stifles the reaction by preventing the formation of reaction product hydrogen, hence stifles the formation of intermediate hydride phase. 4) Hydrogen accelerates the reaction by the counter effect to that of oxygen. 5) The formation of hydride is confirmed by the measurement of hydrogen yield of the gaseous system as well as the x-ray diffraction study. 6) The reaction rate is linearly dependent on imitial water vapor pressure. 7) Activation energy of the reaction determined as a spread value between 5 to 12 kcal/moles. 8) The approximate amount of hydride is determined. 9) The possibilities of the mechanisms involving a combined effect of formation and destruction of protective layer are suggested. (auth)
Research Organization:
Ohio State Univ. Research Foundation, Columbus
DOE Contract Number:
AT(29-1)-789
NSA Number:
NSA-18-008757
OSTI ID:
4096625
Report Number(s):
SC-DC-64-204
Country of Publication:
United States
Language:
English

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Related Subjects

ACTIVATION
CHROMATOGRAPHY
CORROSION
ENERGY
GASES
HUMIDITY
HYDROGEN
LAYERS
MATERIALS TESTING
MEASURED VALUES
METALS, CERAMICS, AND OTHER MATERIALS
OXIDATION
OXYGEN
PHASE DIAGRAMS
PRESSURE
QUANTITATIVE ANALYSIS
QUANTITY RATIO
REACTION KINETICS
TEMPERATURE
URANIUM
URANIUM HYDRIDES