Fabrication and Characterization of Solid Oxide Fuel Cell Interconnect Alloys

Thermal expansion;SOFC;Powder metallurgy;Metallurgy;Alloy design

Church, Benjamin Cortright ; Materials Science and Engineering

University:Georgia Institute of Technology

Department:Materials Science and Engineering

关键词: Thermal expansion;    SOFC;    Powder metallurgy;    Metallurgy;    Alloy design;   

Others  :  https://smartech.gatech.edu/bitstream/1853/4829/1/church_benjamin_c_200412_phd.pdf

美国|英语

来源: SMARTech Repository

【 摘 要 】

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.