Atomic Energy Society of Japan

Functional coatings have developed to reduce tritium permeation and corrosion by tritium breeders in fusion reactor blanket systems. Ceramic coatings such as metal oxides showed high hydrogen isotope permeation reduction performance; however, oxidization of steel substrates by oxygen diffusion through the coating causes degradation of the coating. In this presentation, we report fabrication and characterization of functional coatings consisting primarily of silicon dioxide that has a low oxygen coefficient.