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A novel method to process oxide dispersed strengthened alloy interconnect
Ajay Kumar,
Published in Elsevier B.V.
Volume: 5
Here we report a new process termed reverse friction deposition, wherein the parent rod used as a consumable tool in a friction stir welding machine curls up and gets deposited as a seamless tube over itself. The process parameters were optimized and oxide dispersed strengthened (ODS) ferritic stainless tube was processed. The formed tube exhibited a fine-grained structure and improved oxidation behavior. The weight gain after oxidation was lower in the tubes compared to that in the parent rod. The dispersion of oxide (zirconia) particles in the ODS alloy retarded the outward chromium diffusion by pinning down the grain boundaries which might have been the faster diffusion paths for Cr in absence of the particles. When used in the intended application as an interconnect for solid oxide fuel cells (SOFC), this can prevent Cr poisoning of the cathode which will be in contact with the outer surface of tube. (Cr,Mn)O4 spinel formed in the inner diameter of the ODS tube during oxidation. Such spinels are highly conductive electrically and hence are beneficial for the interconnect. © 2019
About the journal
JournalData powered by TypesetMaterialia
PublisherData powered by TypesetElsevier B.V.
Open AccessNo