Sridharan, K (reprint author), Univ Wisconsin, Dept Engn Phys, Madison, WI 53706 USA.
; Szlufarska, I (reprint author), Univ Wisconsin, Mat Sci & Engn Dept, Madison, WI 53706 USA.
文章类型:
期刊文献
英文摘要:
Transport of Ag fission product through the silicon-carbide (SiC) diffusion barrier layer in TRISO fuel particles is of considerable interest given the application of this fuel type in high temperature gas-cooled reactor (HTGR) and other future reactor concepts. The reactor experiments indicate that radiation may play an important role in release of Ag; however so far the isolated effect of radiation on Ag diffusion has not been investigated in controlled laboratory experiments. In this study, we investigate the diffusion couples of Ag and polycrystalline 3C-SiC, as well as Ag and single crystalline 4H-SiC samples before and after irradiation with C2+ ions. The diffusion couple samples were exposed to temperatures of 1500 degrees C, 1535 degrees C, and 1569 degrees C, and the ensuing diffusion profiles were analyzed by secondary ion mass spectrometry (SIMS). Diffusion coefficients calculated from these measurements indicate that Ag diffusion was greatly enhanced by carbon irradiation due to a combined effect of radiation damage on diffusion and the presence of grain boundaries in polycrystalline SiC samples. (C) 2015 Elsevier B.V. All rights reserved.
