Surface Treatments for Improved Performance of Spinel-coated AISI 441 Ferritic Stainless Steel

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Ferritic stainless steels are promising candidates for IT-SOFC interconnect applications due to their low cost and resistance to oxidation at SOFC operating temperatures. However, steel candidates face several challenges; including long term oxidation under interconnect exposure conditions, which can lead to increased electrical resistance, surface instability, and poisoning of cathodes due to volatilization of Cr. To potentially extend interconnect lifetime and improve performance, a variety of surface treatments were performed on AISI 441 ferritic stainless steel coupons prior to application of a protective spinel coating. The coated coupons were then subjected to oxidation testing at 800 and 850°C in air, ... continued below

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Stevenson, Jeffry W.; Riel, Eric M.; Stephens, Elizabeth V. & Khaleel, Mohammad A. January 1, 2013.

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Ferritic stainless steels are promising candidates for IT-SOFC interconnect applications due to their low cost and resistance to oxidation at SOFC operating temperatures. However, steel candidates face several challenges; including long term oxidation under interconnect exposure conditions, which can lead to increased electrical resistance, surface instability, and poisoning of cathodes due to volatilization of Cr. To potentially extend interconnect lifetime and improve performance, a variety of surface treatments were performed on AISI 441 ferritic stainless steel coupons prior to application of a protective spinel coating. The coated coupons were then subjected to oxidation testing at 800 and 850°C in air, and electrical testing at 800°C in air. While all of the surface-treatments resulted in improved surface stability (i.e., increased spallation resistance) compared to untreated AISI 441, the greatest degree of improvement (through 20,000 hours of testing at 800°C and 14,000 hours of testing at 850°C) was achieved by surface blasting.

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  • Report No.: PNNL-22191
  • Grant Number: AC05-76RL01830
  • DOI: 10.2172/1068652 | External Link
  • Office of Scientific & Technical Information Report Number: 1068652
  • Archival Resource Key: ark:/67531/metadc842162

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  • January 1, 2013

Added to The UNT Digital Library

  • May 19, 2016, 9:45 a.m.

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  • Dec. 2, 2016, 2:46 p.m.

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Stevenson, Jeffry W.; Riel, Eric M.; Stephens, Elizabeth V. & Khaleel, Mohammad A. Surface Treatments for Improved Performance of Spinel-coated AISI 441 Ferritic Stainless Steel, report, January 1, 2013; Richland, Washington. (digital.library.unt.edu/ark:/67531/metadc842162/: accessed October 20, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.