Improved oxidation resistance of coated interconnects at 700ºC

Ebrahimifar, Hadi and Zandrahimi, Morteza (2011) Improved oxidation resistance of coated interconnects at 700ºC. Journal of Metallurgy and Materials Science, 53 (1). pp. 97-102.

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Ferritic stainless steels are being considered as potential interconnect materials for solid oxide fuel cells (SOFCs), in part because of their low cost relative to alternatives. These materials are, however, susceptible to degradation over time. A primary source of degradation is spallation or cracking and weight change, which is due to the repeated thermal cyclic oxidation. In this work, AISI 430 ferritic stainless steel was coated with manganese by pack cementation method to investigate the oxidation behavior at operating conditions of SOFCs. The oxidation behavior of coated substrates was studied as a function of time. Cyclic oxidation has been also tested at 700ºC for 50 cycles. Coated substrates oxidation behavior as a function of time showed that the spinels forming (Mn3O4, MnFe2O4) during annealing in isothermal oxidation improved oxidation resistance by limiting the outward diffusion of Cr cation and the inward diffusion of oxygen onion. The weight gain obtained 1.894 for uncoated substrates and 0.832 for coated substrates after 200 h annealing at 700ºC. Results of cyclic oxidation exhibited that coated substrates demonstrate an excellent resistance against the spallation and cracking.

Item Type:Article
Official URL/DOI:
Uncontrolled Keywords:Ferritic stainless steel, Interconnect materials, Solid oxide fuel cell, Coatings.
Divisions:Material Science and Technology
ID Code:4763
Deposited On:10 Feb 2012 15:16
Last Modified:25 Apr 2013 17:06
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