Materials Properties Database for Selection of High-Temperature Alloys and Concepts of Alloy Design for SOFC Applications

摘要

To serve as an interconnect/gas separator in an SOFC stack, an alloy should demonstrate the ability to provide (1) bulk and surface stability against oxidation and corrosion during prolonged exposure to the fuel cell environment, (2) thermal expansion compatibility with the other stack components, (3) chemical compatibility with adjacent stack components, (4) high electrical conductivity of the surface reaction products, (5) mechanical reliability and durability at cell exposure conditions, (6) good manufacturability, processability and fabricability, and (7) cost effectiveness. As the first step of this approach, a composition and property database was compiled for high temperature alloys in order to assist in determining which alloys offer the most promise for SOFC interconnect applications in terms of oxidation and corrosion resistance. The high temperature alloys of interest included Ni-, Fe-, Co-base superalloys Cr-base alloys, and stainless steels.