Interfacial Reactions of Stainless Steel Interconnector and Yttria Stabilized Zirconia Using Ti-Ni-Ti foils

摘要

The technique used in solder or foil forms to assemble hetero-junction between stainlessrnand 8Y-zirconia is generally applied for solid state fuel cell (SOFC) system. However, thernpower efficiency of SOFC system would significantly hindered due the presence of interfacernleaking accompanied with metallic phases or thermal residual stress at metal-ceramic bonding. Inrnthis research, the interfacial reactions for different temperature and period annealed sandwich ofrnstainless steel (316L), Ti-Ni-Ti multi-foils (TNT), and 8Y-zirconia (8Y) are systemicallyrninvestigated using XRD, SEM/BEI, and TEM/EDS. Structural information indicating that thernpresence of meta-stabled (Fe,Ni)Ti + β-Ti phases upon (Ni,Fe)Ti_2 to (Fe,Ni)Ti phaserntransformation at 316L-Ti side. In addition, at 1250℃, the Ti_2O_3 and TiO phases wouldrnprecipitate in the matrix of γ-(Fe,Ni),Fe_2Ti and TiNi_3 mixtures. These information might capablernof deriving the high temperature microstructure evolution mechanisms of metal-foil-(yttria dopedrnZrO_2) sandwich and is to our knowledge for the very first time demonstrated on 316L/TNT/8Yrnsystem for SOFC applications.