Effect of Bi2O3 on Thermal Properties of Barium-Free Glass-Ceramic Sealants in the CaO-MgO-B2O3-Al2O3-SiO2 System

Pornchanok Lawita; Apirat Theerapapvisetpong; Sirithan Jiemsirilers

doi:10.4028/www.scientific.net/KEM.659.180

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HomeKey Engineering MaterialsKey Engineering Materials Vol. 659Effect of Bi2O3 on Thermal Properties of...

Effect of Bi₂O₃ on Thermal Properties of Barium-Free Glass-Ceramic Sealants in the CaO-MgO-B₂O₃-Al₂O₃-SiO₂ System

Abstract:

Barium-free glass-ceramic sealants for the planar solid oxide fuel cell (pSOFC) have attracted considerable attention to avoid the crystallization of the high coefficient of thermal expansion (CTE) BaCrO₄; reaction product at the interface between barium-containing glass-ceramic sealants and Crofer22 APU interconnect, which decreases the long-term mechanical stability of the sealant. In this study, Barium-free glass-ceramic sealants in the CaO-MgO-B₂O₃-Al₂O₃-SiO₂ system with varying amounts of Bi₂O₃ from 0 to 10 wt. % were prepared by conventional melting and their thermal properties were investigated. The glass transition temperature (T_g), dilatometric softening temperature, and coefficient of thermal expansion (CTE) were determined by a dilatometer. The T_g, onset of crystallization (T_x) and crystallization temperature (T_c) were obtained from DTA. Results of phase analysis by X–ray diffraction of glasses after thermal treatment at 900 oC for 2 h indicated that the major phase of all glasses was diopside (MgCaSi₂O₆) and minor phases were åkermanite (Ca₂MgSi₂O₇) and forsterite (Mg₂SiO₄). The T_g of the fabricated glasses tended to decrease with increasing Bi₂O₃ content while the CTE of glasses increased after the thermal treatment and was in the range of requirement for SOFC sealant.

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Key Engineering Materials (Volume 659)

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180-184

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https://doi.org/10.4028/www.scientific.net/KEM.659.180

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Online since:

August 2015

Authors:

Pornchanok Lawita, Apirat Theerapapvisetpong, Sirithan Jiemsirilers*

Keywords:

Barium-Free, Glass-Ceramics, Sealant, SOFC

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