Abstract
Three advanced high temperature alloys, a Ni-based (CMH-1), a Ni-Fe based (CMH-2), and a Fe-based (CMH-3) alloys have been developed with the assistance of Thermo-Calc and CALPHAD-base JMatPro simulation software, and practically fabricated by vacuum arc melting (VAM) to be potentially used as SOFC interconnect materials. These newly designed alloys have been comprehensively evaluated with respect to their differential thermal analysis, phase stability, oxidation resistance, area specific resistance (ASR), coefficient of thermal expansion (CTE), hardness creep test, and degree of Cr evaporation behavior at 800 °C. Experimental results have been compared to those of widely used commercial Fe-based ferrite alloys, Crofer 22H and ZMG232 G10. Research results illustrate these novel alloys have exhibited well-balanced properties with excellent microstructure stability at 800 °C. Ni-based (CMH-1) and Ni-Fe based (CMH-2) alloys have shown better mechanical strength, lower ASR and lower degree of Cr poisoning at elevated temperature, and Fe-based (CMH-3) alloy has exhibited lower thermal expansion and better oxidation resistance in comparison to Fe-based commercial materials.