Year: 2013
Type: dissertation
Abstract: Solid oxide fuel cells (SOFCs) have gained increased research interest as they are\npromising devices for a decentralized and clean electricity and heat production. Several\nmaterial challenges have to be solved to reach sufficient efficiencies and life times.\nOne important aspect are ferritic stainless steels as interconnect materials which are\ncorrosion resistant, mechanically stable and cost optimized. This work is aimed to\ninvestigate economic solutions for interconnect materials and understand the underlying\ndegradation mechansims. Two substrates, the commercial available steel AISI 441\nand the ferritic stainless steel optimized for an SOFC application Sandvik Sanergy\nHT, were combined with different barrier coatings and exposed in cathode atmosphere.\nThe ferritic stainless steel AISI 441 coated with different reactive element and reactive\nelement/cobalt coatings was investigated concerning corrosion resistance and\nchromium volatilization. Uncoated 441 suffered from severe corrosion, which was successfully\nimproved by coatings of cerium and lanthanum. Cerium/cobalt-coated AISI\n441 was showing excellent and promising properties for a interconnect application.\nSandvik Sanergy HT coated with novel conversion coatings of copper with manganese\nor iron was examined in a similar way. Coatings of copper and iron improved the\ncorrosion and chromium evaporation properties significantly and were promising for\nfurther developments. In contrast did copper combined with manganese as coating\non Sandvik Sanergy HT not result in an improvement in corrosion properties and\nchromium evaporation.
Author: Jan Gustav Grolig
Language: English
Subfield: Materials Chemistry
Field: Materials Science
Domain: Physical Sciences
Open Access status: green
OpenAlex ID: W76547655