Reactions of (La,Ca)CrO3 sealants in yttria-stabilized zirconia-(La,Ca)CrO3 planar solid oxide fuel cell (SOFC) stacks

• Published in: Materials chemistry and physics Vol. 45; no. 2; pp. 97 - 102
• Main Authors: Lee, You-Kee, Park, Jong-Wan
• Format: Journal Article
• Language: English
• Published: Lausanne Elsevier B.V 01.08.1996; Elsevier
• Subjects: Cross-disciplinary physics: materials science; rheology; Doctor blade technique; Exact sciences and technology; Materials science; Methods of deposition of films and coatings; film growth and epitaxy; Physics; Sealants; Solid oxide fuel cell stacks; Yttria-stabilized zirconia films; Doctor blade technique; Solid oxide fuel cell stacks; Sealants; Yttria-stabilized zirconia films; Composition; Lanthanum oxides; Stabilized zirconia; Experimental study; Solid oxide fuel cell; Deposition process; Thin films; Interfaces; Calcium oxides; Chromium oxides; SEM; Diffusion; Quaternary compounds; Yttrium oxides; Concentration distribution
• ISSN: 0254-0584; 1879-3312
• DOI: 10.1016/0254-0584(96)80084-8

Flat yttria-stabilized zirconia (YSZ) films were prepared by the doctor blade technique. The joining of the solid oxide fuel cell (SOFC) stack was carried out using La0.7Ca0.3 + xCrO3 (x = 0.03 and 0.06) green films as sealants between the YSZ electrolyte layer and the La0.8Ca0.2 + yCrO3 (y = 0.02 and 0.03) separator. Reactions between the component layers of the stack were examined in terms of elemental diffusion. The YSZ film produced by the doctor blade technique yields about the same electrical conductivity as the YSZ pellet. During the joining, the Ca in the sealant diffused and dissolved into YSZ and La0.8Ca0.23CrO3, and the sealants reacted with YSZ to form CaZrO3 phase at the interface. The joining was accomplished by the formation of thick CaZrO3 layers at the interface.