Affiliation:
1. Faculty of Materials Science and Ceramics, AGH University of Krakow, Krakow, Poland
2. University of the National Education Commission, Institute of Technology, Kraków, Poland
Abstract
Commercial La0.6Sr0.4Co0.2Fe0.8O3-? powder was used for preparation of
corresponding perovskite films on commercial Crofer 22 APU high chromium
steel by pulsed laser deposition. The obtained films PLD1 and PLD2 with a
thickness of 1.1 and 0.35 ?m, respectively, were dense and homogeneous, with
good adhesion to the polished surface. Oxidation studies of the samples were
carried out in air at 800?C for 200h. The calculated parabolic rate
constant kp after isothermal oxidation for the PLD1 sample was 4.10 ? 10?14
g2cm?4s?1 and was approximately four times lower than the oxidation rate
determined for the PLD2 sample. As a result of the oxidation process, in
both cases, a thin oxide layer of chromia and Mn1.5Cr1.5O4 spinel was formed
on the steel/film interface. In addition, small amounts of
manganese-chromium spinel crystals were observed on the films? surfaces.
Values of the specific electrical resistance at 800 ?C after 100 h of the
experiment were 0.06 and 0.038W?cm2 for PLD1 and PLD2, respectively. The
results indicate that the applied coatings meet the criteria set upon
protective-conductive layers for interconnect materials, for the IT-SOFCs
(intermediate-temperature solid oxide fuel cells) applications.
Publisher
National Library of Serbia
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