Glass-to-Metal seal interfacial analysis using electron probe microscopy for reliable solid oxide fuel cells

Scarlett J. Widgeon, Erica L. Corral, Michael N. Spilde, Ronald E. Loehman

Research output: Contribution to journalArticle

25 Scopus citations

Abstract

The chemical compatibility between sealing glasses and interconnect materials for solid oxide fuel cells (SOFCs) has been studied in SOFC environments. Two borate-based glass compositions were sealed to interconnect materials, 441 stainless-steel (441SS) and Mn 1.5Co 1.5O 4-coated 441SS. The Mn 1.5Co 1.5O 4-coated 441SS coupons were analyzed as-received using X-ray diffraction (XRD) and electron probe microanalysis (EPMA) to obtain structural information and concentration profiles, respectively. The concentration profiles and the lack of Fe-containing phases present in the XRD spectrum show Fe is present throughout the coating, suggesting that Fe is partially substituted in the Mn 1.5Co 1.5O 4 spinel. The glass-metal coupons were heat treated in air at 750°C for 500 h. The specimens were analyzed by EPMA and scanning electron microscope (SEM) to obtain images of the glass microstructure at the interface, to verify seal adherence, and to record concentration profiles across the glass-metal interface, with an emphasis on Cr. In total, four seal configurations were tested and analyzed, and in all cases the glasses remained well adhered to the metal and coating, and there was no microstructural evidence of new reaction phases present at the interface. There was slight diffusion of Cr from the 441SS into the sealing glasses, and Cr diffusion was hindered by the coating on the coated 441SS samples.

Original languageEnglish (US)
Pages (from-to)781-786
Number of pages6
JournalJournal of the American Ceramic Society
Volume92
Issue number4
DOIs
StatePublished - Apr 1 2009

ASJC Scopus subject areas

  • Ceramics and Composites
  • Materials Chemistry

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