NOVELTY - Yttrium stabilized zirconia is ground, and pore making material is added and further ground. Particles are added to liquid phase having triethyl amine, and ground. Polyethylene glycol-n-butyl phthalate is added, and green sheet is formed using slurry. Green sheet is processed in vacuum, and obtained sheet is alternately laminated and sintered to produce high degree consistency green sheet. Sheet is fixed to ceramic substrate, and electrolyte layer is coated. Coated product is sintered, and cathode layers are coated and sintered to manufacture membrane electrode assembly.    USE - Manufacture of membrane electrode assembly for solid oxide fuel cell.    ADVANTAGE - The membrane electrode assembly having high mechanical strength, stability and durability is manufactured, and provides battery having high power density.    DETAILED DESCRIPTION - A mixture (Ni+8YSZ) of nickel and yttrium stabilized zirconia is ground as anode substrate material, and yttrium stabilized zirconia (8YSZ) is ground as an electrolyte material. The particle size of fine particles is equalized, and particles are co-sintered in high-temperature oven. A pore making material is added at room temperature, and mixture is ground and equalized to produce dry fine particles. The dry fine particles are added to a liquid phase containing triethyl amine and methyl ethyl ketone and ethanol as organic solvent, and ground to produce slurry containing uniformly dispersed fine particles. Polyethylene glycol-n-butyl phthalate is added to slurry as plasticizer. Polyvinyl butyral is added as bonding material, ground and equalized. Reduced quantity of cement and plasticizer are added, and solution is adjusted to desired viscosity for formation of sheet. A green sheet is formed by processing the slurry in sheet formation machine. The sheet is sized, and green sheet of required thickness is obtained. The green sheet is placed in a metal mold, and processed in vacuum of 1x 10-3 Torr or less to produce high-density green sheet. The obtained sheet is alternately laminated and subjected to vacuum hot-pressure sintering to produce high degree consistency green sheet. The resulting sheet is clamped and fixed to a ceramic substrate. Organic solvent and pore making material are removed by calcination, and temperature is raised to 1700 degrees C. A high integrity ceramic substrate is produced. An electrolyte layer or an electrode layer is coated with respect to ceramic substrate by screen printing, sputtering, spin coating or plasma spraying method. The coated product is sintered in a high-temperature furnace to produce half-cell. Cathode layers, such as lanthanum doped strontium layer and lanthanum-strontium-cobalt-iron layer are coated on electrolyte layer and sintered in high-temperature furnace to manufacture membrane electrode assembly. An INDEPENDENT CLAIM is included for manufacture of electrolyte or electrode ceramic substrate.    DESCRIPTION OF DRAWING(S) - The drawing shows the flowchart explaining manufacture of membrane electrode assembly. (Drawing includes non-English language text)