Investigation on silver electric adhesive doped with Al2O3 ceramic particles for sealing planar solid oxide fuel cell

Abstract The silver electric adhesive doped with Al 2 O 3 ceramic particles is used as sealing material for planar solid oxide fuel cell (SOFC). The sealing temperature of this sealing material is 600 °C with the heating rate of 2 °C min −1 , and the minimal leak rate ranges from 0.030 sccm cm −1 to 0.040 sccm cm −1 . When doping 15 mass% Al 2 O 3 ceramic particles into this sealing material, the thermal expansion coefficient of this material decreases from 20 ppm K −1 to 15 ppm K −1 , which improves the thermal matching performance and the long-term stability of the material significantly. When using the gradient sealing method with the pure silver electric adhesive and the silver electric adhesive doped with Al 2 O 3 ceramic particles to seal the interface of Ni-YSZ/SUS430 in the simulating cell, the minimal leak rate of 0.035 sccm cm −1 is obtained for the cell. Furthermore, the simulating cell sealed with the compound silver electric adhesive presents good heat-resistant impact ability. Therefore, this compound sealing technique is a very promising sealing method for SOFC.