The microstructure stability of Atmospheric plasma sprayed (Mn,Co)3O4 coating under H2 and air environment

Wednesday, May 13, 2015: 9:40 AM
Room 101A (Long Beach Convention and Entertainment Center)
Dr. Ying-Zhen Hu , State Key Laboratory for Mechanical Behavior of Materials, Xi'an Jiaotong University, Xi'an, China
Prof. Cheng-Xin Li , State Key Laboratory for Mechanical Behavior of Materials, Xi'an Jiaotong University, Xi'an, China
Dr. Shan-Lin Zhang , State Key Laboratory for Mechanical Behavior of Materials, Xi'an Jiaotong University, Xi'an, China
Prof. Guan-Jun Yang , State Key Laboratory for Mechanical Behavior of Materials, Xi'an Jiaotong University, Xi'an, China
Xiao-Tao Luo , State Key Laboratory for Mechanical Behavior of Materials, Xi'an Jiaotong University, Xi'an, China
Prof. Chang-Jiu Li , State Key Laboratory for Mechanical Behavior of Materials, Xi'an Jiaotong University, Xi'an, China
To inhibit the Cr and O diffusion in the ferritic stainless steels interconnect during the operation of IT-SOFC, (Mn,Co)3O4 spinel protective coatings for interconnects have been widely investigated. Based on the specific structure of tubular solid oxide fuel cell stacks, a good chemical, microstructural and phase stability for the protective coating are required in both the oxidizing and reducing environments. In this work, (Mn,Co)3O4 spinel coatings of approximately 100 μm were deposited onto porous substrate by atmospheric plasma spray (APS). The XRD results elucidated that the phase structure is stable for both coatings after test for 20 h. The surface morphology of Mn1.5Co1.5O4 coating indicated that the spinel granules still compacted closely with small particle size of about 250 nm. The coating presented a dense cross-sectional microstructure. The result of the present post-spray treatments indicated that APS spinel coatings possess a high stability under both the reducing and oxidizing environment.
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