Method for manufacturing a membrane
AssigneeNorsk Hydro ASA
InventorDavid Waller
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Abstract
The present invention relates to a method for manufacturing a dense and crack-free ceramic membrane which selectively transports oxygen when it is subjected to an oxygen partial pressure gradient, by the following steps: a) preparation of a porous ceramic substrate, with an open network of pores, which allows the transport of gas; b) deposition of a film or coating of an oxygen ion conducting material onto the porous ceramic substrate, by contacting the porous substrate with a colloidal dispersion or slip; c) thermally treating the substrate and film or coating to produce a dense, crack-free membrane on the surface of the porous substrate.
Claims4
A method for manufacturing a dense and crack-free ceramic membrane having a dense film or coating on a porous substrate which selectively transports oxygen when it is subjected to an oxygen partial pressure gradient, which comprises
- a) adding a pore former to a powder to form a mixture, heating said mixture to remove the pore former and to partially sinter the mixture to form said porous substrate,
- b) preparing a colloidal dispersion or slip from a powder having the same chemical composition and same particle size distribution as the powder used in a),
- c) dipping said substrate into said dispersion or slip where the liquid phase in said dispersion or slip is drawn into the pores of the substrate through capillary action and a layer of particles is deposited on the surface of the substrate and a further deposition of particles occurs when the substrate is withdrawn from the dispersion or slip by a dip-coating action, and
- d) sintering the substrate with the layer from c) at a temperature which results in formation of a dense film or coating supported on said substrate that retains open porosity.
Dependencies are inferred from the claim text.