Small-scale units interconnection

To avoid these problems, Sulzer has used metal interconnects in their small-scale residential SOFC heat and power unit [29]. The alloy is largely chromium, with 5 wt% iron and 1 wt% yttria to give dispersion strengthening, made by Plansee AG in Austria. This alloy has almost the same expansion coefficient as YSZ and has the benefit of improved strength and toughness when compared with lanthanum chromite. But it requires coating to prevent chromium migration and is also expensive at the present time. 

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