The feasibility study of applying an acid boric and glass infiltrated mica to prevent the leakage and mixture of use gasses for hightemperature fuel cells

In this study, the possibility of using mica for this application was investigated. First, mica gasket including small Phlogopite flakes with organic binders was used and its performance duringas leakage was simulated in a small set-up simulating fuel cell operating condition (air atmosphere, temperature of 800 C and time of 100 h). Due to heating of mica during operation, binders were burned out and remaining pores acted as leakage path. These leakage paths were filled by acid boric and the mica performance was enhanced up to 20%. The major leakage path (mica and its adjacent interface) was filled by a glass and a successful application of mica-glass layer was obtained for leakage prevention.