Glass ceramic sealants belonging to BAS (BaO-Al2O3-SiO2) ternary system modified with B2O3 addition: a different approach to access the SOFC seal issue

Abstract Four compositions in the BaO–Al 2 O 3 –SiO 2 system modified with B 2 O 3 were investigated with regard to their use as glassy seals in anode supported SOFC or iT-SOFC. The glassy system studied contains varying percentages of SiO 2 , Al 2 O 3 , B 2 O 3 , and high content of BaO as modifier (67–74%-wt). Their glass transition (Tg) and maximum densification point lies between 630 and 680 °C, and 734 °C to 828 °C, respectively. The viscosities of the four glasses are situated between 10 7 to 10 9.5 Pa.s, in the sealing range (730–830 °C). Heat treatment at 850 °C, revealed crystalline phases identified as BaAl 2 Si 2 O 8 (hexacelsian) and BaSiO 3 . The thermal expansion coefficient (TEC) of the obtained glasses (8.8–10.5 ppm/K) was comparable to zirconia (YSZ) electrolyte, and shows chemical compatibility and high characteristic bond strength (up to 33 ± 7 MPa). The compositions with higher BaO content in the system studied seem to be good candidates for iT-SOFC sealant application.

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