Abstract
Composite ceramic thick film of lanthanum strontium manganate (LSM) and yttria-stabilized zirconia (YSZ), 2–6 μm in thickness, were deposited on ferritic stainless steel (STS444) by aerosol deposition (AD), as an oxidation resistance coating layer in the metallic interconnector of a solid oxide fuel cell (SOFC). The YSZ volume ratio in the LSM–YSZ composite layer was adjusted from 0 to 100 vol% and the electrical resistivity was measured at 800 °C using a DC 4-probe method. The interface microstructure and composition of the coating layer and stainless steel after oxidation at 800 °C in air was examined. The coated oxide layers were highly dense without pores or cracks and maintained good adhesion, even after oxidation at 800 °C for 250 h at all compositions. The LSM–YSZ composite ceramics showed higher stability and electrical conductivity than the sole LSM layer at 800 °C, possibly due to the high microstructural stability of YSZ against grain growth at 800 °C.
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