Abstract
The poor thermodynamic and thermal stability of self-healing glass sealants restrict their applications in planar solid oxide fuel cells (SOFCs). In this paper, a calcium borate crystalline is prepared by melting-quench and a subsequent crystallization. The crystalline phases include CaB 4O 7 and CaB 2O 4. The in situ observation reveals that the micro-indentation on the surface of such crystalline can be healed when heating from room temperature to 840 °C at a heating rate of 40 °C min −1. Combining with the improved thermal stability, the crystalline sealant with desired self-healing property, at the operational temperature of SOFCs (e.g., 700–900 °C), provides additional solution for the sealing challenge of SOFCs.
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