OXIDATION RATES OF ALTERNATIVELY IRRADIATED AND ANNEALED, PERIODICALLY IRRADIATED AND ANNEALED AND CONTINUOUSLY IRRADIATED GRAPHITES

Technical Report · Tue Jan 01 04:00:00 EST 1963

OSTI ID:4009176

Schweitzer, D G; Singer, R M

Oxidation, rates and activation energies between 350 deg C and 500 deg C were obtained for pile grade graphite after seventeen cycles of neutron reirradiations and 350 deg C anneals. Although considerable radiation damage was retained after this treatment, neither the oxidation rates nor the activation energy could be distinguished from unirradiated control stock. 0xidation rates for pile grade graph ite were also obtained before and during the accumulation of 9 cycles of uniform neutron reirradiations and 350 deg C anneals. The rates at 400 deg C throughout this treatment did not significantly change. The defects responsible for the enhancement in oxidation after the flrst irradiation appear to be removed when the graphite is subjected to reirradiations and low temperature anneals. The only vacancy species expected in both the continuously irradiated and the cycled graphites is the monovacancy. It is therefore concluded that specific interstitial clusters cause the enhancement in oxidation observed after the first neutron irradiation. (auth)

• Research Organization: Brookhaven National Lab., Upton, N.Y.
• DOE Contract Number: AT(30-2)-GEN-16
• NSA Number: NSA-18-020580
• OSTI ID: 4009176
• Report Number(s): BNL-7964; CONF-474-1
• Country of Publication: United States
• Language: English

Related Subjects

ANNEALING
CONTROL
DEFECTS
GRAPHITE
IRRADIATION
METALS, CERAMICS, AND OTHER MATERIALS
NEUTRONS
OXIDATION
RADIATION EFFECTS
REACTION KINETICS
TEMPERATURE
VACANCIES