SILVA, MAVIAEL J. daBARTOLOME, JOSE F.AZA, ANTONIO H. deMELLO CASTANHO, SONIA2016-03-082016-03-082016SILVA, MAVIAEL J. da; BARTOLOME, JOSE F.; AZA, ANTONIO H. de; MELLO CASTANHO, SONIA. Glass ceramic sealants belonging to BAS (BaO-Alsub(2)Osub(3)-SiOsub(2) ternary system modified with Bsub(2)Osub(3) addition: A different approach to access the SOFC seal issue. <b>Journal of the European Ceramic Society</b>, v. 36, n. 3, p. 631-644, 2016. DOI: <a href="https://dx.doi.org/10.1016/j.jeurceramsoc.2015.10.005">10.1016/j.jeurceramsoc.2015.10.005</a>. Disponível em: http://repositorio.ipen.br/handle/123456789/25821.0955-2219http://repositorio.ipen.br/handle/123456789/25821Four compositions in the BaO–Al2O3–SiO2 system modified with B2O3 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 SiO2, Al2O3, B2O3, 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 107 to 109.5 Pa.s, in the sealing range (730–830 ◦C). Heat treatment at 850 ◦C, revealed crystalline phases identified as BaAl2Si2O8 (hexacelsian) and BaSiO3. 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 contentin the system studied seem to be good candidates for iT-SOFC sealant application.631-644openAccesssolid oxide fuel cellsglassceramicsbarium oxidesaluminium oxidessilicon oxidessealing materialsthermal expansionphase diagramsmicroscopyArtigo de periódico33610.1016/j.jeurceramsoc.2015.10.005https://orcid.org/0000-0002-0155-910098.08