Development of Si-free Sealing Technique for Solid Oxide Fuel Cells withLong-term Durability at High-temperatures

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Silicon-free gas sealing technique was developed, employing liquid-phase-oxidation (LPO) joining of yttria-stabilized zirconia (YSZ) and stainless alloy via ZrO2-dispersed Al interlayer. During the LPO-joining, the ZrO2/Al2O3 composite interlayer was formed between YSZ and Fe-Cr alloy. The composite interlayer had an excellent oxygen gas seal property, and high durability under thermal cycles. Furthermore, it was also confirmed that the composite interlayer formed via NiO-dispersed Al interlayer had high durability under thermal cycles.