Electrolyte sheet including a peripheral region having a surface roughness different from a surface roughness in a region other than the peripheral region, method of producing the same, and solid oxide fuel cell including the same

摘要

The electrolyte sheet for solid oxide fuel cell of the present invention has different surface roughnesses between the peripheral region and the region other than the peripheral region at least on one side. The surface roughness Ra(b) in the peripheral region is at least 0.05 μm and less than 0.3 μm. The surface roughness Ra(i) in the region other than the peripheral region is at least 0.2 μm and at most 1.2 μm. And, the ratio of Ra(i) to Ra(b) (Ra(i)/Ra(b)) is more than 1 and at most 4. Here, the surface roughness Ra(b) and the surface roughness Ra(i) are arithmetic mean roughness values and determined by an optical and laser-based non-contact three-dimensional profile measuring device in accordance with a German standard ‘DIN-4768’.

主权项

1. An electrolyte sheet for solid oxide fuel cell, comprising:
a peripheral region and a region other than the peripheral region at least on one surface of the electrolyte sheet, the peripheral region and the region other than said peripheral region being located on a same side of the electrolyte sheet while the peripheral region being disposed on a periphery of said electrolyte sheet, and if the electrolyte sheet comprises a hole, a region surrounding the hole is included in the peripheral region, wherein a surface roughness Ra(b) in the peripheral region is different from a surface roughness Ra(i) in the region other than the peripheral region, wherein the surface roughness Ra(b) in the peripheral region is at least 0.05 μm and less than 0.3 μm, wherein the surface roughness Ra(i) in the region other than the peripheral region is at least 0.2 μm and at most 0.72 μm, wherein a ratio (Ra(i)/Ra(b)) of the surface roughness Ra(i) to the surface roughness Ra(b) is more than 1 and at most 4, and wherein the surface roughness Ra(b) and the surface roughness Ra(i) are arithmetic mean roughness values that are determined by an optical and laser-based non-contact three-dimensional profile measuring device in accordance with a German standard ‘DIN-4768’.