Dimensional changes induced in poorly crystalline isotropic carbons by irradiation
โ Scribed by J.L. Kaae; D.W. Stevens; J.C. Bokros
- Publisher
- Elsevier Science
- Year
- 1972
- Tongue
- English
- Weight
- 798 KB
- Volume
- 10
- Category
- Article
- ISSN
- 0008-6223
No coin nor oath required. For personal study only.
โฆ Synopsis
The density and dimensional changes induced by fast-neutron irradiation of isotropic pyrolytic carbons deposited below 1500ยฐC have been investigated. Irradiation temperatures ranged from 600" to 1400ยฐC and fast-neutron fluences extended to 8 X 10" n/cm2. It has been found that, in contrast to the more crystalline carbons deposited at higher temperatures, these carbons do not increase in volume at high fast-neutron fluences and that the lineal dimensional changes do not increase with temperature above 1000ยฐC. At temperatures below lOOO"C, the dimensional changes are not greatly different from those of the more crystalline carbons.
๐ SIMILAR VOLUMES
## Data are presented on irradiation-induced dimensional changes of poorly crystalline carbons at high temperatures (>9OO"C ). The materials surveyed include: (I) carbon fibers, (2) glassy carbons, (3) carbonaceous matrix materials for HTGR fuel rods and (4) pyrocarbons. The materials above are li
This paper describes an investigation of the dimensional behavior of unrestrained and spherically ,restrained isotropic carbons deposited at both high temperatures (> 1500ยฐC; HTI carbons) and low temperatures (< 1500ยฐC; LTI carbons) during irradiation at 600", lOOo", and 1250ยฐC to fast-neutron fluen
of prior heat treating ranging from 1000 to 2800ยฐC. Those determined were lattice parameters, crystallite sizes, X-ray anisotropy, electrical resistivity, bulk density, helium density, pore spectrum and neutron irradiation stability at 715ยฐC. A correlation between these properties and the dimensiona