A Study on Electrical Resistivity of BaO–CaO–SiO₂–Al₂O₃ Seal Glass Used in Solid Oxide Electrolytic Cell (SOEC)

Abstract:

The electrical resistivty (R) of BaO–CaO–SiO2–Al2O3 (BCSA) based glass, which was used in SOEC, was measured by impedance analyzer from room temperature to sealing temperature, and it was founded that electrical resistivity of all seal glass decreases with temperature. When temperature is lower than the soften temperature of glass, the electrical resistivity of all seal glass was no less than 107Ω∙cm. At 850°C, the resistivity of the 16BaO–16CaO–42SiO2–8Al2O3 glass (G1) reached 4.40×106Ω∙cm, and even at the sealing temperature, their resistivity was still above 105-106Ω∙cm. With the decrease of ratio of Si/B from 3 to 1, the electrical resistivity of glass decreased from 4.40×106Ω∙cm to 8.96×104Ω∙cm. The electrical resistivity of glass in BCSA system could be significantly affected by B2O3 and alkaline earth oxides. The results show that the electrical resistivity of glass was improved with the increasing of non-bridging oxygen and the average field strength. All glasses can be used as sealants at high temperature with no electrical shunting in SOEC.

• Periodical: Key Engineering Materials (Volumes 512-515)
• Pages: 1574-1578
• DOI: https://doi.org/10.4028/www.scientific.net/KEM.512-515.1574
• Online since: June 2012
• Authors: Jie Hao, Chang Sheng Deng, Qing Feng Zan, Jing Ming Xu
• Keywords: Average Field Strength, Electrical Resistivity, Non-Bridging Oxygen, Seal Glass, SOEC

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