Lee, Hae-Weon Park, Mansoo Hong, Jongsup Kim, Hyoungchul Yoon, Kyung Joong Son, Ji-Won Lee, Jong-Ho Kim, Byung-Kook 2024-01-20T03:34:16Z 2024-01-20T03:34:16Z 2021-09-05 2016-08 1996-1944 https://pubs.kist.re.kr/handle/201004/123830 Solid oxide fuel cells (SOFCs) are inevitably affected by the tensile stress field imposed by the rigid substrate during constrained sintering, which strongly affects microstructural evolution and flaw generation in the fabrication process and subsequent operation. In the case of sintering a composite cathode, one component acts as a continuous matrix phase while the other acts as a dispersed phase depending upon the initial composition and packing structure. The clustering of dispersed particles in the matrix has significant effects on the final microstructure, and strong rigidity of the clusters covering the entire cathode volume is desirable to obtain stable pore structure. The local constraints developed around the dispersed particles and their clusters effectively suppress generation of major process flaws, and microstructural features such as triple phase boundary and porosity could be readily controlled by adjusting the content and size of the dispersed particles. However, in the fabrication of the dense electrolyte layer via the chemical solution deposition route using slow-sintering nanoparticles dispersed in a sol matrix, the rigidity of the cluster should be minimized for the fine matrix to continuously densify, and special care should be taken in selecting the size of the dispersed particles to optimize the thermodynamic stability criteria of the grain size and film thickness. The principles of constrained sintering presented in this paper could be used as basic guidelines for realizing the ideal microstructure of SOFCs. English MDPI AG CHEMICAL SOLUTION DEPOSITION COMPOSITE CATHODES MICROSTRUCTURAL DEVELOPMENT FRACTURE ORIGINS POWDER COMPACTS IT-SOFCS ELECTROLYTE FILMS DENSIFICATION INCLUSIONS Constrained Sintering in Fabrication of Solid Oxide Fuel Cells Article 10.3390/ma9080675 1 MATERIALS, v.9, no.8 MATERIALS 9 8 scie scopus 000383456800014 2-s2.0-84984595847 Chemistry, Physical Materials Science, Multidisciplinary Metallurgy & Metallurgical Engineering Physics, Applied Physics, Condensed Matter Chemistry Materials Science Metallurgy & Metallurgical Engineering Physics Article CHEMICAL SOLUTION DEPOSITION COMPOSITE CATHODES MICROSTRUCTURAL DEVELOPMENT FRACTURE ORIGINS POWDER COMPACTS IT-SOFCS ELECTROLYTE FILMS DENSIFICATION INCLUSIONS solid oxide fuel cell constrained sintering electrolyte cathode composite