| La0.8Ca0.2CrO3 Interconnect Materials for Solid Oxide Fuel Cells: Combustion Synthesis and Reduced-Temperature Sintering |
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Beom-Kyeong Park, Jong-Won Lee, Seung-Bok Lee, Tak-Hyoung Lim, Seok-Joo Park, Rak-Hyun Song, Dong-Ryul Shin |
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Fuel Cell Research Center, Korea Institute of Energy Research;Fuel Cell Research Center, Korea Institute of Energy Research;Fuel Cell Research Center, Korea Institute of Energy Research;Fuel Cell Research Center, Korea Institute of Energy Research;Fuel Cell Research Center, Korea Institute of Energy Research;Fuel Cell Research Center, Korea Institute of Energy Research;Fuel Cell Research Center, Korea Institute of Energy Research; |
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| Abstract |
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Sub-micrometer $La_{0.8}Ca_{0.2}CrO_3$ powders for ceramic interconnects of solid oxide fuel cells were synthesized by the aqueous combustion process. The materials were prepared from the precursor solutions with different glycine (fuel)-to-nitrate (oxidant) ratios (${phi}$). Single-phase $La_{0.8}Ca_{0.2}CrO_3$ powders with a perovskite structure were obtained after combustion when ${phi}$ was equal to or larger than 0.480. Especially, the stoichiometric precursor with ${phi}$ = 0.555 yielded the spherical $La_{0.8}Ca_{0.2}CrO_3$ particles with 150-250 nm diameters after calcination at $1000^{circ}C$. When compared with the powders synthesized by the solid-state reaction, the combustion-derived, fine powders exhibited improved sinterability, leading to near-full densification at $1400^{circ}C$ in oxidizing atmospheres. Moreover, a small quantity of glass additives was used to reduce the sintering temperature, and considerable densification was indeed achieved at temperatures as low as $1100^{circ}C$. |
| Keywords:
Solid oxide fuel cell, Interconnect, Lanthanum chromite, Combustion synthesis, Sintering |
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