ELECTROLYTE SHEET FOR SOLID OXIDE TYPE FUEL CELL AND PROCESS FOR PRODUCTION THEREOF, SINGLE CELL FOR SOLID OXIDE TYPE FUEL CELL, AND SOLID OXIDE TYPE FUEL CELL

摘要

Disclosed is an electrolyte sheet for a solid oxide type fuel cell, in which an edge area of at least one surface thereof and an area of the one surface thereof except the edge area have different surface roughness values from each other, the surface roughness Ra(b) of the edge area is not less than 0.05 μm and less than 0.3 μm and the surface roughness Ra(i) of the area except the edge area is 0.2 to 1.2 μm inclusive as measured on a laser optical non-contact three-dimensional shape measuring device, and the ratio of Ra(i) to Ra(b) (i.e., Ra(i)/Ra(b)) is more than 1 and not more than 4. The surface roughness Ra(b) and the surface roughness Ra(i) are arithmetical mean roughness values and are surface roughness parameters determined in accordance with a Germany standard "DIN-4768".