Kazimierz Przybylski

University of Toyama Repository

Perovskite and spinel-based protective coatings AGH University of Science and Technology, Faculty of Materials Science and Ceramics Kazimierz Przybylski Metallic interconnects for planar intermediate temperatぽesolid oxide fuel cel (IT-SOFC) stacks are almost exclusively fabricated with Fe-16÷25 wt.-% Cr feritic stainless stels. These metallic materials offer such advantages as low cost, good corrosion resistance in the dual oxidizing/reducing atmosphere due to chromia or chromiルrichscale growth and, finally, thermal expansion match with ceramic cel components. The disadvantage of metal interconnects is the growth of an oxide scale which increases the bulk resistance and contact resistance, and is prone to spalling [ 1岡2].Furthermore, chromium in the scale forms volatile species such as Cr02(0H)2 or Cr03 which have been associated with cel poisoning, particularly on the air electrode side [3]. In this work, Crofer 22APU and DIN 50049 f註riticsteel covered with perovskite (La,Ca)Cr03, (La,Sr)Cr03, (La,Sr)(Co,Fe)03 films and spinel Mn1.5Co1.504, Mn1,5Cr1,504 compounds were investigated. These films were obtained via pulsed laser deposition (PLD), screen・printingand cobalt electroplating methods. Uncoated and coated specimens were thermally oxidized in air and Hz/H20 gas mixture at 700働900°Cfor up to 1000 hrs. The aim was to study the oxidation properties of coated Fe-Cr steels with regard to microstructure development of the conducting multilayer formed as a result of interaction between the thick films and the steel substrate. Finally, the performance of the investigated metal/ceramic materials is discussed in terms of electrical properties and Cr vaporization rate. Figure I shows the polished taper cross-sectional morphology ofLCCr film deposited on D制 50049steel and oxidized in air at 800°C for 200 hrs. From this figure, it follows that the LCCr layer exhibits good adhesion to the metallic core and was porous. This film, having the same thickness on the whole cross”section of about 20 μm, consists of oval grains with sizes from about 0.1 to 0.5 μm. The XRD diffraction, taken from the coating successively thinned down by polishin丸 revealedthe presence of Lao.2Cao.sCr03, LaCr03 and (Mn,Fe)Cr204・Fig. 1 SEM micrograph of cross-section ofLCCr film coated on DIN50049 stel and oxidized in air at 800°C for 200 hrs. [I] W.J. Quadakkers, J. Piron帽Abellan,V. Shemet, L. Singheiser, Mater. High Temp. 20 (2003) l5. [2] X. Chen, P.Y. Hou, C.P. Jacobson, S.J. Visco, L.C.D. Jonghe, Solid State Ionics 176 (2005) 425. [3] K. Hilpert, D. D部，M.Miller, D.H. Peck, and R. Weij3, J. Electrochem. Soc. 143 (1996) 3642. 73 

Perovskite and spinel-based protective coatings

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Perovskite and spinel-based protective coatings

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