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Conference paper

Interdiffusion between Co3O4 coating and the oxide scale of Fe-22Cr alloy

In Mass and Charge Transport in Inorganic Materials-ii — 2002

By Hansson, Anette Nørgaard1; Friehling, Peter B.; Linderoth, Søren; Somers, Marcel A.J.1

From

Department of Management Engineering, Technical University of Denmark1

In solid oxide fuels cell stacks, the Fe-Cr interconnector plates and their oxidation scale formed during operation must have sufficiently high electrical conductivity at the operating temperature. It is anticipated that this can be achieved by reaction-diffusion between Co3O4 and the chromia scale on Fe-Cr alloys.

Coatings of Co3O4 were deposited on a Fe-22Cr alloy by plasma spraying and spray-painting. As-deposited samples were oxidised in air containing 1% H2O at 900C for various exposure time. During exposure the Fe-22Cr alloy forms an oxide scale, which reacts with the coating. The effects of inter-diffusion between the oxide scale and the Co3O4 coating were investigated with X-ray diffraction, scanning electron microscopy and energy-dispersive spectroscopy.

The results obtained are discussed in relation to a calculated Cr-Co-oxide phase diagrams.

Language: English
Publisher: Techna Srl
Year: 2002
Proceedings: Mass and charge transport in inorganic materials
Types: Conference paper
ORCIDs: Somers, Marcel A.J.
Keywords

Materials technology

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