Patent ID: 9698443
Date: 2017-07-04
CPC Classifications: C04B,H01M,Y02E,Y02P

Claim:
1. An electrolyte sheet for a solid oxide fuel cell, the sheet having a thickness of 50 to 300 μm, wherein in at least one of principal surfaces of the sheet, (1) a burr height [ΔH (0-3)] in a first zone is 100 μm or less, as measured by irradiating the principal surface of the sheet with a laser beam at a pitch of 0.01 mm and three-dimensionally analyzing light reflected from the principal surface using a laser optical three-dimensional shape measurement device, the first zone being a zone extending between a peripheral edge of the sheet and a position 3 mm inside the peripheral edge, (2) a ratio [ΔH (0.61-3)/ΔH (0-0.6)] of a burr height [ΔH (0.61-3)] in a third zone to a burr height [ΔH (0-0.6)] in a second zone is 0.5 or more and 2.0 or less, as calculated from the burr heights measured by irradiating the principal surface of the sheet with a laser beam at a pitch of 0.01 mm and three-dimensionally analyzing light reflected from the principal surface using the laser optical three-dimensional shape measurement device, the second zone being a zone extending between the peripheral edge of the sheet and a position 0.6 mm inside the peripheral edge, and the third zone being a zone extending between a position 0.61 mm inside the peripheral edge of the sheet and the position 3 mm inside the peripheral edge, and (3) a ratio [ΔH (0.11-3)/ΔH (0-0.1)] of a burr height [ΔH (0.11-3)] in a zone extending between a position 0.11 mm inside the peripheral edge of the sheet and a position 3 mm inside the peripheral edge to a burr height [ΔH (0-0.1)] in a zone extending between the peripheral edge of the sheet and a position 0.1 mm inside the peripheral edge is 0.5 or more and 1.3 or less.