MANUFACTURE OF FUEL ELECTRODE OF CELL FOR SOLID ELECTROLYTE FUEL CELL

摘要

PROBLEM TO BE SOLVED: To inexpensively and efficiently change the component composition without forming an interface in the thickness direction by laminating plural kinds of green sheets so that the component composition successively changes in the thickness direction, and drying and baking the green sheets after causing them to adapt themselves in a solvent atmosphere. SOLUTION: Two or more kinds of component raw material powders constituting a fuel electrode are mixed with a solvent by changing the composition ratio to prepare plural kinds of raw material slurry different in the component composition desirably having viscosity of 2000 to 3000 cp. These respective raw material slurry are molded desirably into a thickness not more than 20 μm to obtain plural kinds of green sheets having the component composition. These respective green sheets are laminated so that the component composition successively changes in the thickness direction. In that case, a low thermal expansion coefficient component is abundantly arranged on the electrolyte layer side, and a highly conductive component is abundantly arranged on the fuel side. This laminated body is pressurized/held for 24 hours or more in a solvent atmosphere to be familiarized so as to form a continuous concentration change. Afterwards, the laminated body is baked after drying to obtain a fuel electrode having an electrolyte layer and a multilayer structure having a small thermal expansion difference.