Abstract
Novel TiN-Ni cermets with high oxidation resistance and excellent electrical conductivity were developed and evaluated as intermediate-temperature solid oxide fuel cells (IT-SOFCs) interconnects. Three TiN-Ni cermets with 30 vol.%, 50 vol.% and 70 vol.% Ni were prepared by optimizing hot-pressed sintering parameters. Their oxidation kinetics was systematically investigated in air at 600–800°C. Relative density, oxidation rate constant and electrical conductivity can be readily optimized by adjusting the Ni content in the cermets, and their corresponding maximum values reached 99.6%, 2.56 × 10−11 g2 cm−4 s−1 (at 800°C) and 1.5 × 104 S cm−1 (500 h oxidation reaction at 800°C). Coefficient of thermal expansion could be adjusted as well in the 9.7 × 10−6 k−1 to 13.2 × 10−6 k−1 range to match with the IT-SOFCs components. The electrical conductivity of all samples studied in this work was above 1.0 × 104 S cm−1, which is much higher than that of all other cermets reported in the literature. We demonstrated that TiN-Ni cermets are promising material as candidates for IT-SOFCs interconnects.
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The authors are grateful for the financial support from the National Natural Science Foundation of China (Grant No. 51671209). The authors declare that they have no conflict of interest.
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Duan, H., Liu, Y., Qi, Q. et al. TiN-Ni Cermets with High Oxidation Resistance and Electrical Conductivity as Candidates for Intermediate-Temperature Solid Oxide Fuel Cell Interconnects. JOM 71, 3782–3788 (2019). https://doi.org/10.1007/s11837-019-03418-7
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DOI: https://doi.org/10.1007/s11837-019-03418-7