The linear dimensional changes of anisotropic and near-isotropic graphites were measured after irradiation in the range 300 to 1500Β°C to 3.3 x 102r n/cm" (E > 0.18 MeV). The presence of a nongraphitizing impregnant coke in an anisotropic needle-coke graphite increased its volume contraction, reduced
The relationship between irradiation temperature and dimensional changes of nuclear graphites
β Scribed by M Van den Berg; M.R Everett; A Kingsbury
- Publisher
- Elsevier Science
- Year
- 1975
- Tongue
- English
- Weight
- 131 KB
- Volume
- 13
- Category
- Article
- ISSN
- 0008-6223
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β¦ Synopsis
The characterization of property changes in various grades of near-isotropic, "binderless" grades of graphite as functions of fluence accumulated at 715Β°C from 0 to 42 x 10" neutrons/cm' (E > 50 keV) was made. Generally, the average coefficients of thermal expansion (CTE) from 20 to 600Β°C and the roomtemperature values for strengths, fracture strains, Young's moduli, shear moduli, and calculated figures of merit (FOM) for resistance to thermal shock all ultimately decreased with fluence.
π SIMILAR VOLUMES
Two previously proposed quantitative models for the radiation-induced dimensional changes in polycrystalline graphite treated the material as containing a single crystalline phase. One model was based on thermodynamic relationships and the other was derived by averaging the contributions of the indi
part of a joint (Dragon/KFA/Euratom/RCN) irradiation programme in the HFR Petten, The Netherlands, extensive data were obtained on the irradiation behaviour at 8 temperature levels between 400 and 1400Β°C of 10 different Gilsocarbon graphites. A computer technique was used to systematize and compare