Formation of thin walled ceramic solid oxide fuel cells

Details Formation of thin walled ceramic solid oxide fuel cells Formation of thin walled ceramic solid oxide fuel cells

1988-03-28

1989-11-28

Skapars, Anthony

Metal working

Method of mechanical manufacture

Electrical device making

429 33, 429 4, H01M 810

Patent

active

048834971

ABSTRACT:
To reduce thermal stress and improve bonding in a high temperature monolithic solid oxide fuel cell (SOFC), intermediate layers are provided between the SOFC's electrodes and electrolyte which are of different compositions. The intermediate layers are comprised of a blend of some of the materials used in the electrode and electrolyte compositions. Particle size is controlled to reduce problems involving differential shrinkage rates of the various layers when the entire structure is fired at a single temperature, while pore formers are provided in the electrolyte layers to be removed during firing for the formation of desired pores in the electrode layers. Each layer includes a binder in the form of a thermosetting acrylic which during initial processing is cured to provide a self-supporting structure with the ceramic components in the green state. A self-supporting corrugated structure is thus formed prior to firing, which the organic components of the binder and plasticizer removed during firing to provide a high strength, high temperature resistant ceramic structure of low weight and density.

REFERENCES:
patent: 4476196 (1984-10-01), Poeppel et al.
patent: 4499663 (1985-02-01), Zwick et al.
patent: 4749632 (1988-06-01), Flandermeyer et al.

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