Measurements of tritium permeation through SiC/SiC composite manufactured via nano-powder infiltration and a transient eutectoid process were carried out using pure tritium and tritium diluted with hydrogen. Using pure tritium at a pressure of 0.6Pa on the front side of the composite, the steady-state tritium permeation flux was estimated to be 9.5 x 10−12mol/m2s. In experiments involving tritium diluted with hydrogen, it was found that the steady-state permeation fluxes went down with decreasing tritium fraction in tritium–hydrogen gas mixtures, although the partial pressure of tritium on the front side was fixed at 0.6Pa.

Tritium Permeation Behavior in SiC/SiC Composites. K.Isobe, T.Yamanishi, S.Konishi: Fusion Engineering and Design, 2010, 85[7-9], 1012-5