Seven barium borosilicate glass samples have been investigated, in which their
composition are 1) barium borosilicate 2) barium zinc silicate 3) barium calcium silicate 4) barium
strontium silicate 5) barium zinc calcium silicate 6) barium zinc strontium silicate and 7) barium
calcium strontium silicate. The effect of ZnO, CaO and SrO additives on the coefficient of thermal
expansion (COE) by dilatometer has been studied. The amorphous and crystallinity of the samples
before and after use were investigated via both X-ray diffractometer. The sealing interface was
observed using scanning electron microscopy with energy dispersive spectroscopy. The joined
Samaria doped yttria electrolyte (SDC)/glass-ceramic and the metallic interconnect (Crofer 22
APU)/glass-ceramic was tested at the SOFC working temperature of 800 ?C for 50 h. The results
showed that ZnO, CaO, and SrO affect the COE values, in which values are 5.24, 9.68, and
9.84 ? 10-6 ?C-1, respectively. ZnO showed a drawback effect on COE value in barium zinc
borosilicate. The joint interfaces between the glass sealants and Crofer 22 APU after crystallization
at 800 ?C for 50 h show the barium borosilicate, barium strontium borosilicate, barium zinc calcium
borosilicate, and barium zinc strontium borosilicate adhered well to SDC electrolyte and Crofer 22
APU metallic interconnect. After gas tightness of barium zinc strontium borosilicate at 700 ?C for
9 h in H2/O2 atmosphere showing good bonding, which no crack has been observed at interface.
Therefore, barium zinc strontium borosilicate is possibly suitable for working with Planar-SOFCs.