Abstract
Boron carbide possessing porosities of 91 and 77% theoretical density (T.D.) were irradiated at about 300 deg C to 6.0 x 10/sup 18/ ~ 3.3 x 10/sup 19/ n/cm/sup 2/ in helium atmosphere. The thermal conductivity, the electric resistivity and the linear thermal expansion were determined. Upon irradiation to 3.3 x 10/sup 19/ n/cm/sup 2/, cracking occurred in all of the 91% T.D. specimens and in two of the five 77% T.D. specimens. The thermal conductivity changed with irradiation more markedly in the case of the 77% T.D. specimen, which also increased its specific clectric resistivity by a factor of 10/sup 4/, while that of the 91% T.D. specimen increased by less than 10-fold. This significant difference in thermal and electric conductivity change by irradiation is attributed to the difference in microstructure. It was observed that the recovery of radiation damage began at about 300 deg C when the specimens were sub!ected to heating and the changes observed in respect of thermal conductivity, electric resistivity and linear thermal expansion. (auth)
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