| 摘要 |
PURPOSE:To prevent crack initiation in a nickel-zirconia thermet porous base board by furnishing each unitary cell with a solid electrolyte layer provided over the whole main surface on one side of the porous base board as a fuel electrode, a covering layer provided on the peripheral side faces of the base board, and with an air electrode which is placed on the solid electrolyte layer. CONSTITUTION:A powder of nickel oxide (NiO) is mixed with a powder of zirconia stabilized by 8% yttria (8%Y2O3-ZrO2) in a specified proportion followed by granulating press shaping, and baking processes at 1,400-1,600 deg.C to yield a porous fuel electrode 21. With the fuel electrode 21 as a support, zirconia is plasma fusion sprayed to the peripheral side faces and a main surface free from ribs of fuel electrode 21, and thereby a solid electrolyte layer 22 and a covering layer 25 are formed. Gas is Ar/He mixture gas having a pressure of 100 Torr. Then a paste consisting of La0.9Sr0.1 MnO3 and a solvent is applied by brush on the solid electrolyte layer 22, followed by drying at 1200 deg.C, and thus an air electrode 23 is formed. A gas separator 24 is prepared using lantha num chromite (La0.8Ca0.2CrO3). |
