Properties of Bi2O3-BaO-SiO2-RxOy Glass with ZrO2-filler Composite Sealant

doi:10.3724/SP.J.1077.2010.01058

Abstract

Abstract: It is research focus that composite materials including glass and skeletal structure are used as sealant in solid oxide fuel cell (SOFC). The composite sealant with 10wt%-30wt% ZrO₂-filler in the Bi₂O₃-BaO-SiO₂(BiBaSi) glass were researched in order to improve sealing properties at high temperature. As a result, the coefficients of thermal expansion of the composite sealants were increased than that of basic glass. The suitable sealing temperatures of composite sealant vary from the 720℃ of base glass to 780℃, 860℃ and 900℃ of BiBaSi-10Zr, BiBaSi-20Zr, BiBaSi-30Zr, respectively. ZrO₂-fillers in base glass have two roles: Parts of ZrO₂-fillers as skeletal structure materials always exist in base glass, which help to maintain the required shape and size of sealant. The other ZrO₂-fillers can also drop into the network of the BiBaSi glass and therefore form a new phase Bi₄Si₃O₁₂. Two kinds of crystal phase of ZrO₂and Bi₄Si₃O₁₂ coexist in the composite sealant to improve the stability of composite system in high temperature. The properties of sealing materials could be easily controlled in SOFC sealant by changing the amount of ZrO₂-fillers in composite materials.

Key words: solid oxide fuel cell, Bi₂O₃-BaO-SiO₂ glass, ZrO₂-filler, composite sealant, sealing properties

CLC Number:

TQ171

HAN Min-Fang, DU Jun-Ping, Yu Li-An. Properties of Bi₂O₃-BaO-SiO₂-R_xO_y Glass with ZrO₂-filler Composite Sealant[J]. Journal of Inorganic Materials, 2010, 25(10): 1058-1064.

References

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Properties of Bi₂O₃-BaO-SiO₂-R_xO_y Glass with ZrO₂-filler Composite Sealant

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