At present, the insufficient thermo-mechanical stability of sealing glass presents a challenge for solid oxide fuel cells (SOFCs). In this work, we report for the first time that a rigid-resilient transition occurs in a calcium borosilicate sealing glass upon heating at 700 °C for different durations. The elastic modulus increases from 28.1–40.0 GPa for 24 h to 92.3–105.1 GPa for 100 h, while the corresponding hardness increases from 2.5–3.1 GPa to 8.1–9.2 GPa. In addition, a possible mechanism for the rigid-resilient transition has been proposed. The reported results provide a new approach to solve the sealing problem of SOFCs.

当前，密封玻璃的不足的热机械稳定性对固体氧化物燃料电池（SOFC）提出了挑战。在这项工作中，我们首次报告在700°C的温度下加热不同时间后，硼硅酸钙密封玻璃会发生刚性-弹性转变。弹性模量从24小时的28.1–40.0 GPa增加到100小时的92.3–105.1 GPa，而相应的硬度从2.5–3.1 GPa增加到8.1–9.2 GPa。另外，已经提出了一种用于刚性-弹性过渡的可能的机制。报道的结果为解决SOFC的密封问题提供了一种新方法。