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Oxidation Behavior of Ferritic Steel Alloy Coated with Highly Dense Conducting Ceramics by Aerosol Deposition
Author(s) -
Choi JongJin,
Park DongSoo,
Hahn ByungDong,
Ryu Jungho,
Yoon WoonHa
Publication year - 2008
Publication title -
journal of the american ceramic society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.9
H-Index - 196
eISSN - 1551-2916
pISSN - 0002-7820
DOI - 10.1111/j.1551-2916.2008.02506.x
Subject(s) - materials science , spinel , oxide , alloy , microstructure , ceramic , layer (electronics) , metallurgy , coating , electrical resistivity and conductivity , deposition (geology) , solid oxide fuel cell , composite material , electrode , chemistry , paleontology , anode , sediment , electrical engineering , biology , engineering
Conducting La 0.8 Sr 0.2 MnO 3 (LSM) ceramic layers with a thickness of ∼10 μm were deposited on ferritic stainless steel (SS) by aerosol deposition for use as an oxidation resistance coating layer in the metallic interconnects of solid oxide fuel cell. The microstructural evolution and electrical properties of the LSM‐coated SS were observed. The coated layers were fairly dense without pores or cracks, and maintained good adhesion even after oxidation at 800°C for 1000 h in air atmosphere. The surface of the bare SS after heat treatment at 800°C for 1000 h was covered with Cr‐containing oxide scales, and the electrical conductivity was sharply decreased. However, the LSM‐coated SS alloy showed a surface microstructure with almost no chromic oxide formation and maintained good electrical conductivity after the heat treatment. Close observation of the interface between LSM and SS indicated the presence of ∼500‐nm‐thick Cr 2 O 3 and MnCr 2 O 4 spinel phase, which may have caused the long‐time deterioration of the interconnector performance. The area‐specific resistance of the LSM‐coated alloy after heat treatment at 800°C for 1000 h was 10.4 mΩ·cm 2 .