Solid oxide type fuel cell-use electrode support substrate and production method therefor
AssigneeNippon Shokubai Co., Ltd.
InventorsMasatoshi Shimomura, Teruhisa Nagashima, Kazuo Hata
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Abstract
Disclosed is an electrode support substrate for a fuel cell which is even, gives a small fluctuation in gas permeability, and is capable of carrying out printing of an anodic electrode with high adhesiveness, and which comprises a ceramic sheet having a porosity of 20 to 50%, a thickness of 0.2 to 3 mm and a surface area of 50 cm2 or more wherein the variation coefficient of measured values of the gas permeable amounts of areas measured by the method according to JIS K 6400 ranges from 5 to 20% and further the surface roughness measured with a laser optical manner three-dimensional shape measuring device may be 1.0 to 40 μm as the maximum roughness depth (Rmax) thereof.
Claims12
A process for producing an electrode support substrate in sheet form for a solid oxide type fuel cell comprising:
- providing a slurry comprising a conductive component powder, a skeleton component powder, a pore-forming agent powder and a binder,
- wherein the slurry is defoamed under reduced pressure after milling to adjust the viscosity thereof to 40 to 100 poise (25° C.), and kept at room temperature while rotating stirring fans therein at a rotating speed of 5 to 30 rpm for 20 to 50 hours, and
- wherein a particle size distribution of the slurry has a peak in each of ranges of 0.2 to 2 μm and 3 to 50 μm, and a content ratio by mass of fine particles in the range of 0.2 to 2 μm to coarse particles in the range of 3 to 50 μm is in a range of 20/80 to 90/10;
- fashioning the slurry into a sheet by a doctor blade method to obtain a green sheet, wherein the green sheet is a precursor of the electrode support substrate;
- cutting the green sheet into a given shape;
- and
- then firing the green sheet having the given shape to produce the electrode support substrate.
Dependencies are inferred from the claim text.