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Capsules made of AISI 316L stainless steel tube (diameter 10 mm; thickness 0.5 mm) coated by an oxidized aluminide layer inside (few microns thick) and outside (some tens of microns thick), and capsules made of bare AISI 316L stainless steel, are tested for a comparison of the deuterium permeation. The measurements are performed for temperatures ranging from 523 K to 723 K and D(2) driving pressures spanning in the range 30 Pa to 10000 Pa. Results show a reduction permeation rate factor 20 for the coated tube with respect to the bare one, whilst the activation energy is found to be the same, thus suggesting a reduction of the effective available area for permeation is occurring. These results in some cases agree with the TRINE irradiation tests performed on similar capsules for tritium permeation at 773 K. For the TRINE experiment, aluminide coating is found a very effective tritium permeation barrier (reduction by a factor of about 1000) for a helium (He) purging gas with 0.1% O(2). The effects of isotopic swamping-dilution and of the environmental oxidising power are also discussed.

Additional information

Authors: PERUJO A, JRC Ispra (IT);SERRA E, JRC Ispra (IT);FRANCONI E, ENEA, Centro Ricerche Energia Frascati, Roma (IT);CASADIO S, ENEA Casaccia, Roma (IT)
Bibliographic Reference: Paper presented: Fourth International Workshop on, Ceramic Breeder Blanket Interactions, Tokyo (JP), October 9-11, 1995
Availability: Available from (1) as Paper EN 39468 ORA
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