High-temperature mechanical properties of a solid oxide fuel cell glass sealant in sintered forms

摘要

High-temperature mechanical properties of a silicate-based glass sealant (GC-9) for planar solid oxidi fuel cell have been studied in sintered forms. Ring-on-ring biaxial flexural tests are carried out at roon temperature to 800℃ for the sintered GC-9 glass. The results are also compared with those in cas bulk forms. From the force-displacement curves, the glass transition temperature (T_g) of the non-aged sintered GC-9 glass is estimated to be between 700℃ and 750℃, while that of the aged one is betweei 750℃ and 800℃. Due to a crack healing effect of the residual glass at high temperature, the flexura strength of the sintered GC-9 glass at temperature of 650℃ to T_g point is greater than that at roon temperature. At temperature above T_g, the flexural strength and stiffness are considerably reduced to ; level lower than the room-temperature one. The sintered GC-9 glass with pores and crystalline phase: has a flexural strength lower than the cast bulk one at temperature of 650℃ and below. Due to a greate extent of crystallization, the flexural strength and stiffness of the sintered GC-9 glass are greater thai those of the cast bulk one at 700-800℃.