Abstract
Oxide growth and thermal degradation of three ferritic SOFC interconnector alloys have been investigated.
The materials included a standard grade (alloy 430) and two alloys (Crofer 22 APU, ZMG 232) specifically designed for interconnector service. All alloys appear to follow parabolic oxidation up to 500 h at 740{degree sign}C in air. During oxidation, a consistent decrease of iron and increase of chromium and manganese were observed in the surface oxide.
Some chromium transport was detected on the cathode side surface of the cell after 500 h at 740{degree sign}C. The results emphasise the importance of appropriate coating of the interconnectors, to prevent chromium poisoning on the cathode.
A natural coating material would be similar or compatible with the ceramic cathode.
Such a coating also has the additional advantage that simpler and cheaper steel grades could be used as the interconnector material.
The materials included a standard grade (alloy 430) and two alloys (Crofer 22 APU, ZMG 232) specifically designed for interconnector service. All alloys appear to follow parabolic oxidation up to 500 h at 740{degree sign}C in air. During oxidation, a consistent decrease of iron and increase of chromium and manganese were observed in the surface oxide.
Some chromium transport was detected on the cathode side surface of the cell after 500 h at 740{degree sign}C. The results emphasise the importance of appropriate coating of the interconnectors, to prevent chromium poisoning on the cathode.
A natural coating material would be similar or compatible with the ceramic cathode.
Such a coating also has the additional advantage that simpler and cheaper steel grades could be used as the interconnector material.
| Original language | English |
|---|---|
| Pages (from-to) | 151-157 |
| Journal | ECS Transactions |
| Volume | 2 |
| Issue number | 9 |
| DOIs | |
| Publication status | Published - 2007 |
| MoE publication type | A1 Journal article-refereed |
