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Coatings 2018, 8(1), 42; doi:10.3390/coatings8010042

Oxidation Characteristics and Electrical Properties of Doped Mn-Co Spinel Reaction Layer for Solid Oxide Fuel Cell Metal Interconnects

School of Materials Science and Engineering, Jiangsu University of Science and Technology, Zhenjiang 212003, China
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Received: 7 December 2017 / Revised: 16 January 2018 / Accepted: 16 January 2018 / Published: 22 January 2018
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Abstract

To prevent Cr poisoning of the cathode and to retain high conductivity during solid oxide fuel cell (SOFC) operation, Cu or La doped Co-Mn coatings on a metallic interconnect is deposited and followed by oxidation at 750 °C. Microstructure and composition of coatings after preparation and oxidation is analyzed by X-ray diffraction (XRD) and scanning electron microscopy (SEM). High energy micro arc alloying process, a low cost technique, is used to prepare Cu or La doped Co-Mn coatings with the metallurgical bond. When coatings oxidized at 750 °C in air for 20 h and 100 h, Co3O4 is the main oxide on the surface of Co-38Mn-2La and Co-40Mn coatings, and (Co,Mn)3O4 spinel continues to grow with extended oxidation time. The outmost scales of Co-33Mn-17Cu are mainly composed of cubic MnCo2O4 spinel with Mn2O3 after oxidation for 20 h and 100 h. The average thickness of oxide coatings is about 60–70 μm after oxidation for 100 h, except that Co-40Mn oxide coatings are a little thicker. Area-specific resistance of Cu/La doped Co-Mn coatings are lower than that of Co-40Mn coating. (Mn,Co)3O4/MnCo2O4 spinel layer is efficient at blocking the outward diffusion of chromium and iron. View Full-Text
Keywords: copper; lanthanum; coating; in-situ oxidation; electrical properties copper; lanthanum; coating; in-situ oxidation; electrical properties
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MDPI and ACS Style

Guo, P.; Lai, Y.; Shao, Y.; Zhang, Y.; Sun, H.; Wang, Y. Oxidation Characteristics and Electrical Properties of Doped Mn-Co Spinel Reaction Layer for Solid Oxide Fuel Cell Metal Interconnects. Coatings 2018, 8, 42.

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