Effect of Na2O on Properties of Diopside-Based Sealing Glass-Ceramics for Solid Oxide Fuel Cell

Abstract

Abstract: In this paper, R₂O-RO-Al₂O₃-B₂O₃-SiO₂ based sealing glass-ceramics with diopside as main crystalline phase was designed and prepared for the sealing of solid oxide fuel cell (SOFC). The effect of Na₂O content (0%～10%, mole fraction) on coefficient of thermal expansion (CTE), crystallization and sintering wetting property of sealing glass was analyzed, and the sealing interface between glass and SUS403 stainless steel after high temperature and long time heat treatment was characterized. The results show that Na₂O can significantly improve the thermal properties of glass, the prepared glass samples can be obtained as glass-ceramics with main crystalline phase of diopside (CaMgSi₂O₆) after heat treatment in sealing temperature range. With the increase of Na₂O content, the crystal phase content of main crystal phase diopside is different, and coefficient of thermal expansion of glass-ceramics increases from 8.22×10^-6 K^-1 before crystallization to 11.79×10^-6 K^-1, which can meet the thermal expansion match of SOFC sealing. When the Na₂O content is greater than or equal to 8% (mole fraction), the crystalline phase of high expansion calcium akermanite (Ca₂MgSi₂O₇) is precipitated in glass, which is not conducive to sealing. After sealing 4% (mole fraction) glass sample with SUS403 at high temperature for 100 h at 850 ℃, the sealing interface is dense and firm without air pores. There is a Cr₂O₃ layer at the interface and a thin layer of diopside which is denser than glass sealing body. The existence of these dense layers is beneficial to limit the diffusion of Na⁺ from sealing glass to interface.

Key words: sodium oxide, diopside, high temperature sealing glass-ceramics, solid oxide fuel cell, coefficient of thermal expansion, sealing interface

CLC Number:

TQ171

TAN Jinqi, XIN Caili, TU Hengyong, HAN Zhuangzhuang, LIU Bing, YUAN Jian. Effect of Na₂O on Properties of Diopside-Based Sealing Glass-Ceramics for Solid Oxide Fuel Cell[J]. BULLETIN OF THE CHINESE CERAMIC SOCIETY, 2023, 42(8): 2922-2927.

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Effect of Na₂O on Properties of Diopside-Based Sealing Glass-Ceramics for Solid Oxide Fuel Cell

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