Glass ceramic sealants belonging to BAS (BaO-Alsub(2)Osub(3)-SiOsub(2) ternary system modified with Bsub(2)Osub(3) addition
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2016
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Journal of the European Ceramic Society
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Four 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.
Como referenciar
SILVA, 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. Journal of the European Ceramic Society, v. 36, n. 3, p. 631-644, 2016. DOI: 10.1016/j.jeurceramsoc.2015.10.005. Disponível em: http://repositorio.ipen.br/handle/123456789/25821. Acesso em: 08 Jul 2024.
Esta referência é gerada automaticamente de acordo com as normas do estilo IPEN/SP (ABNT NBR 6023) e recomenda-se uma verificação final e ajustes caso necessário.