Interfacial characterization of nickel-yttria-stabilized zirconia cermet anode/interconnect joints with Ag-Pd-Ga active filler for use in solid-oxide fuel cells

Chih Long Chao, Chun Lin Chu, Yiin Kuen Fuh, Ray Quen Hsu, Shyong Lee, Yung Neng Cheng

Research output: Contribution to journalArticlepeer-review

16 Scopus citations

Abstract

Nickel-yttria-stabilized zirconia cermet anode (Ni-YSZ)/interconnect joints with silver-palladium-gallium (Ag-9Pd-9Ga) active fillers are prepared by vacuum brazing. The joint structure and microstructure are analyzed by X-ray diffraction (XRD) and scanning electron microscopy coupled with energy dispersive spectroscopy (SEM/EDS), and by using an electron probe microanalyzer (EPMA). SEM observations of the joint show no cracks near the interface, confirming the compatibility of the Ag-9Pd-9Ga filler with a different anode and interconnect. The XRD pattern of the joint specimens oxidized at 800°C for 250 h shows Cr2O3 and (Mn,Cr)3O4 surface layers. EPMA analysis of the cell/Ag-9Pd-9Ga/alloys joint at the cross section shows Cr, O, Fe, Zr, Ni, Ag, Pd, Ga, Y, and Mn. Overall, the results indicate that the bonding between metal and cermet is well established and the interface is smooth. By correlating the XRD and EPMA analysis results, we also analyzed the possible stages during joint oxidation. The joint strength was evaluated at 25 and 800°C under shear and tensile loading conditions, respectively, and the brazed Ag-9Pd-9Ga sealant compared favorably with the commercially available glass-ceramic GC-9 counterpart.

Original languageEnglish
Pages (from-to)1523-1533
Number of pages11
JournalInternational Journal of Hydrogen Energy
Volume40
Issue number3
DOIs
StatePublished - 21 Jan 2015

Keywords

  • Interconnect
  • Joint strength
  • Solid oxide fuel cell (SOFC)

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