Fabrication and Characterization of Solid Oxide Fuel Cell Interconnect Alloys

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Please use this identifier to cite or link to this item: http://hdl.handle.net/1853/4829

Title: Fabrication and Characterization of Solid Oxide Fuel Cell Interconnect Alloys
Author: Church, Benjamin Cortright
Abstract: Metal alloy honeycomb structures were fabricated using a paste extrusion technique and characterized for potential application as interconnects in solid oxide fuel cells. Thermal expansion characteristics of Fe-Cr, Fe-Ni, Ni-Cr, Fe-Ni-Cr, and similar alloys containing an oxide dispersion were determined and compared with the thermal expansion behavior of yttria-stabilized zirconia (YSZ). A method was developed to calculate thermal expansion mismatch between two materials under a variety of heating and cooling conditions. It was shown that Fe 20 wt% Cr and Fe 47.5 wt% Ni alloys have low expansion mismatch with YSZ under a wide range of heating and cooling conditions. Oxidation experiments showed that Fe-Cr alloys have superior oxidation resistance in air at 700℃compared with Fe-Ni-Cr alloys with similar chromium contents. The inclusion of oxide dispersions (Y₂O₃ and CaO) into an alloy honeycomb was shown to improve oxidation resistance without affecting thermal expansion behavior. The honeycomb extrusion process provides a method by which experimental alloys can be produced and characterized rapidly to develop an alloy suitable for use as an interconnect in a solid oxide fuel cell.
Type: Dissertation
URI: http://hdl.handle.net/1853/4829
Date: 2004-11-03
Publisher: Georgia Institute of Technology
Subject: Thermal expansion
Powder metallurgy
Alloy design
Department: Materials Science and Engineering
Advisor: Committee Chair: Thomas H. Sanders, Jr.; Committee Member: Henry Paris; Committee Member: Joe K. Cochran; Committee Member: Naresh Thadhani; Committee Member: Robert Speyer
Degree: Ph.D.

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