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Details
| Material Type: | Thesis/dissertation, Manuscript |
|---|---|
| Document Type: | Book, Archival Material |
| All Authors / Contributors: |
Alex Shyang Tsai |
| OCLC Number: | 67836345 |
| Description: | xviii, 136 leaves : ill. |
| Responsibility: | by Alex Shyang Tsai. |
Abstract:
Abstract: Solid oxide fuel cells (SOFCs) are a promising clean energy source. However, manufacturing and reliability remain the largest barriers to mainstream implementation. Failure in these stacks typically occurs at the seals joining various superalloys either to an adjacent metal or ceramic (the individual cells themselves) component. Chemical reactions between the seal materials and any neighboring components causes third-phase formation believed to be detrimental to stack integrity. The purpose of our study is to examine the relationship, if any, between curvature change and specific reactions at the metal-ceramic interface. Through the use of optical and laser profilometry, surface curvatures of the alloy (Crofer 22) and various zirconia-based ceramic materials were quantified before, after and during joining. As most planar SOFC stack designs operate at temperatures ranging from 700-900⁰C any mismatch of thermal expansion coefficients between either the original materials or subsequently formed phases should influence curvature via the generation of localized stresses. The amount of curvature change from joining was not influenced by the type of ceramic electrolyte or sealing glass used, though the there did appear to be curvature effects during heating. The sealing atmosphere also appears to have an effect on the phases formed, which appear to mitigate the surface changes.
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