Low coefficient of thermal expansion (CTE) nickel base superalloys for interconnect applications in intermediate temperature solid oxide fuel cells (SOFC)

Abstract

This paper deals with the fabrication, microstructure and oxidation resistance of Ni-base alloys with CTE on the order of 12.5×10 -6/°C. Alloys based on the composition Ni-(18-22wt%) Mo-12Cr-1Ti were readily rolled into 1 mm strip. Modifications to this base composition, such as increasing Cr or Ti content adversely affected the ability to form the alloy. The oxidation resistance at 750°C of several of these alloys was superior to a Fe-base alloy containing significantly more (22wt%) Cr.