Metal working – Method of mechanical manufacture – Electrical device making
Patent
1992-07-29
1994-03-01
Kalafut, Stephen
Metal working
Method of mechanical manufacture
Electrical device making
427115, 429 30, H07M 810
Patent
active
052903230
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
This invention relates to a manufacturing method for a solid-electrolyte fuel cell (solid-oxide fuel cell) having a three-layer structure and equipped with a fuel-electrode and an air-electrode with a solid- electrolyte sandwiched between them.
1. Background Art
A planar type fuel cell having a structure similar to a phosphoric acid fuel cell or a molten carbonate fuel cell, a monolithic type fuel cell proposed by Argonne National Laboratory of U.S.A., a tubular multi-component type fuel cell under development by Electrotechnical Laboratory of Japan, and a tubular single-component type proposed by Westinghouse Co. of U.S.A. etc. have been known as the solid-electrolyte fuel cell. However, the tubular single-component type fuel cell proposed by Westinghouse Co. becomes the object of public attention at present owing to its easiness of gas sealing at high temperature and simpleness of stack structure.
A plasma spray method, a chemical vapor deposition method (CVD), an electrochemical vapor deposition method (EVD) and a spray pyrolysis method of organometallic zirconium salt etc. have been known as the manufacturing method for solid-electrolyte for use in such the solid-electrolyte fuel cells. However, only the plasma spray method and the electrochemical vapor deposition method (EVD) are the method for obtaining a dense solid-electrolyte film.
In the foregoing plasma spray method and an electrochemical vapor deposition method (EVD), an expensive manufacturing equipment is necessary and a lot of time is required in masking work for forming a part requiring the solid-electrolyte film and a part not requiring the film. Therefore, there has been a technical problem in mass-production of fuel cell.
Further, as another method for obtaining the dense solid-electrolyte film, there has been tried a method as shown by FIG. 55, in which a stabilized zirconia powder 110 is formed into a slurry, applied on a support material 100 and then sintered In the method shown by FIG. 55, however, particles of the stabilized zirconia powder 110 shrink at the time of sintering. Therefore, there have been problems that a crack 130 has been produced on a solid-electrolyte film 120 formed on the support material 100 and that the solid-electrolyte film 120 has been peeled off.
2. Disclosure of the Invention
A principal object of this invention is to provide a solid-electrolyte fuel cell having a three-layer structure, which can be manufactured inexpensively and easily without producing a crack and a peeling-off in each layer.
The present invention provides a manufacturing method for a solid-electrolyte fuel cell equipped with a fuel-electrode and an air-electrode for its electrodes with a solid-electrolyte sandwiched between them; characterized by that the method comprises a process in which a slurry is poured into a concave portion of a mold composed of a material having a property to suck a specified solvent so as to form an electrolyte green body, the slurry being made up by mixing a solid-electrolyte powder to the same solvent as the above specified solvent, a process in which a slurry is poured into the concave portion to form an electrode green body so as to form a multi-layer green body integrated with the electrolyte green body, the slurry being prepared by mixing an electrode powder to the same solvent as the above specified solvent, and a process in which the multi-layer green body is removed the mold from it and then sintered; and the electrode green body formed in the above concave portion is one or both of a fuel-electrode green body and an air-electrode green body.
In the present invention, since the specified solvent of the slurry is sucked in the mold, the electrolyte green body and the electrode green body are formed under a stable condition so that they are not cracked and peeled off. Further, the principal work is pouring and sintering of the slurry in this invention so that the manufacturing method is easy, and the mold and a device for sintering etc. are required at most so that this method is inexpe
REFERENCES:
patent: 3377203 (1968-04-01), Mobius et al.
patent: 3843400 (1974-10-01), Radford et al.
patent: 4782392 (1988-11-01), Haycock et al.
patent: 4957673 (1990-09-01), Schroeder et al.
Nomura Eiichi
Okuyama Ryoichi
Kalafut Stephen
Yuasa Corporation
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