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<p>A quaternary silicate-based CaO-ZnO-B₂O₃-SiO₂ (CZBS) glass system was synthesized with varying compositions as a hermetic sealing material for solid-state electrolyte cells (SOEC) operating at the low temperature of 650&#xa0;°C. Glass composition was manipulated to form a hardystonite crystal phase, which resulted in a high coefficient of thermal expansion (CTE) suitable for SOEC application. The glass transition temperature, flow button test, and CTE values of the glass and glass ceramics were evaluated, as well as their adhesion characteristics, by joining YSZ and FC460 using the CZBS glass system. Interactions between the glass ceramic sealants and the SOEC components after sealing and aging tests at operating temperatures were explored with scanning electron microscopy (SEM). The practical feasibility of the obtained glass and glass ceramics was examined in a hydro-thermal test using an autoclave at the SOEC operating temperature.</p>

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Glass ceramic hermetic sealant for low temperature solid oxide electrolyzer cells based on the CaO-ZnO-B2O3-SiO2 system

  • 期刊论文

  • 发表日期：

    2026年4月14日

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  • Tae Ryoung Kim,
  • Devarajulu Gelija,
  • Jiwoo Lee,
  • Sun Dong Kim,
  • Woon Jin Chung

摘要

A quaternary silicate-based CaO-ZnO-B₂O₃-SiO₂ (CZBS) glass system was synthesized with varying compositions as a hermetic sealing material for solid-state electrolyte cells (SOEC) operating at the low temperature of 650 °C. Glass composition was manipulated to form a hardystonite crystal phase, which resulted in a high coefficient of thermal expansion (CTE) suitable for SOEC application. The glass transition temperature, flow button test, and CTE values of the glass and glass ceramics were evaluated, as well as their adhesion characteristics, by joining YSZ and FC460 using the CZBS glass system. Interactions between the glass ceramic sealants and the SOEC components after sealing and aging tests at operating temperatures were explored with scanning electron microscopy (SEM). The practical feasibility of the obtained glass and glass ceramics was examined in a hydro-thermal test using an autoclave at the SOEC operating temperature.