THE HIGH TEMPERATURE OXIDATION OF BERYLLIUM. PART V. IN MOIST CARBON DIOXIDE AND MOSIT CARBON MONOXIDE
The chemistry and the kinetics of the oxidation of electrolytic flake beryllium in moist carbon dioxide and in moist carbon monoxide (either gas, total pressure 10 cm of mercury; partial pressure of water, 1.2 cm) were investigated at temperatures in the ranges 500 to 750 deg C and 600 to 700 deg C, respectively. In moist carbon dioxide, the reaction with water vapor predominates over that with carbon dioxide in the proportions of approximstely 4: 1, the reactions are: Be + H/sub 2/0 = BeO + H/sub 2/; Be + C0/sub 2/= BeO + CO; and 2Be + CO/sub 2/= 2BeO + Be/sub 2/C. The oxidation is protective up to 600 deg C and non- protective at 650 deg C and above; the reaction after breakaway takes place at the particle boundaries giving rise to an interpenetrating region of oxide and unattacked metal. In moist carbon monoxide, the principal reaction is with water vapor and the reaction Be + CO = BeO + C only contributes about 3% to the total weight gain. An investigation of the oxidation in a moist carbon monoxide-- carbon dioxide mixture (partial pressures: water, 1.2 cm; carbon monoxide, 0.5 cm; carbon dioxide, 8.3 cm) at 700 deg C shows that the kinetics are the same as in moist carbon dioxide, the reaction with carbon monoxide only contrbuting 02.% to the total weight gain. (auth)
- Research Organization:
- Univ. of Exeter, Eng.
- NSA Number:
- NSA-15-026503
- OSTI ID:
- 4004075
- Journal Information:
- J. Nuclear Materials, Journal Name: J. Nuclear Materials Vol. Vol: 4
- Country of Publication:
- Country unknown/Code not available
- Language:
- English
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