Studies of mechanical properties and irradiation damage nucleation of HTGR graphites. Progress report, February 1, 1976--January 31, 1977. [2020 and H440 graphites]
Sample preparation for irradiation studies was completed, but irradiations are unlikely to commence until late 1977. The effect of compressive stresses up to 650 psi on the reaction rate of Stackpole 2020 graphite with helium containing small amounts of either H/sub 2/O or CO/sub 2/ was investigated. In no case was any effect found. Relationships between the compressive strengths of 2020 and Great Lakes H440 graphites and air oxidation burn-off show that a 10% burn-off results in a 50% strength reduction. Sample external dimensions were unchanged even with a 50% burn-off. Strain to failure was relatively independent of burn-off except for 2020 graphite with burn-offs in excess of approximately 28%, when strains increased rapidly. Scanning electron microscope examination reveals preferential removal of binder material over filler particles. The effect of flow rate of He/H/sub 2/O and He/CO/sub 2/ gas mixtures over the graphite sample during oxidation showed a decrease in oxidation rate with increasing flow rate in the flow range 13.8 to 15.3 ml/s. 9 figures, 2 tables.
- Research Organization:
- Pennsylvania State Univ., University Park (USA)
- OSTI ID:
- 7118973
- Report Number(s):
- COO-2712-2
- Country of Publication:
- United States
- Language:
- English
Similar Records
Effect of steam oxidation on strength, elastic modulus, and strain at fracture of graphite 2020. [HTGR]
Studies of mechanical properties and irradiation damage nucleation of HTGR graphites. Final report
Related Subjects
210300 -- Power Reactors
Nonbreeding
Graphite Moderated
36 MATERIALS SCIENCE
360603* -- Materials-- Properties
360604 -- Materials-- Corrosion
Erosion
& Degradation
CARBON
CARBON COMPOUNDS
CARBON DIOXIDE
CARBON OXIDES
CHALCOGENIDES
CHEMICAL REACTION KINETICS
CHEMICAL REACTIONS
COMPRESSION STRENGTH
CRYOGENIC FLUIDS
ELEMENTS
FAILURES
FLOW RATE
FLUIDS
GAS COOLED REACTORS
GASES
GRAPHITE
GRAPHITE MODERATED REACTORS
HELIUM
HIGH TEMPERATURE
HTGR TYPE REACTORS
HYDROGEN COMPOUNDS
KINETICS
MECHANICAL PROPERTIES
MECHANICAL STRUCTURES
NONMETALS
OXIDATION
OXIDES
OXYGEN COMPOUNDS
RARE GASES
REACTION KINETICS
REACTOR COMPONENTS
REACTOR CORES
REACTORS
STRAINS
STRESSES
SUPPORTS
VERY HIGH TEMPERATURE
WATER