Ceramic molded body comprising a photocatalytic coating and method for production the same
AssigneeErlus Aktiengesellschaft
InventorsAxel Thierauf, Eduard Gast, Friederike Bauer
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Abstract
The invention relates to a ceramic moulded body consisting of an oxide ceramic base material and comprising a surface which self-cleans by means of water-sprinkling or percolation. Said moulded body has a porous, oxide ceramic coating which is photocatalytically active and has a specific surface of between approximately 25 m2/g and approximately 200 m2/g, preferably between approximately 40 m2/g and approximately 150 m2/g. The invention also relates to a method for producing one such ceramic moulded body.
Claims42
A ceramic molded body, more specifically a roof tile, tile, clinker brick or facade wall, of oxide-ceramic base material with a surface which is self-cleaning upon spraying or sprinkling with water, characterized in that the molded body has a porous oxide-ceramic coating, wherein the coating is photocatalytically active and contains TiO2 and has a specific surface area in a range of between 25 mg2/g, and 200 m2/g, preferably between 40 m2/g and 150 m2/g, wherein the TiO2 is produced by flame hydrolysis of TiCl4 as highly disperse TiO2.
A process for the production of a ceramic molded body, more specifically a roof tile, tile, clinker brick or facade wall, of oxide-ceramic base material with a surface which is self-cleaning upon spraying or sprinkling with water, wherein the molded body has a photocatalytically active, porous, oxide-ceramic TiO2-containing coating with a specific surface area in a range of between 25 m2/g and 200 m2/g, preferably 40 m2/g and 150 m2/g, wherein the process includes the following steps:
- (a) mixing photocatalytically active, oxide-ceramic powder which contains TiO2, wherein the TiO2 is produced by flame hydrolysis of TiCl4 as highly disperse TiO2, adjusting agent and/or adhesive and a liquid phase to afford a suspension,
- (b) applying the suspension produced in step (a) to the oxide-ceramic base material to produce a layer, and
- (c) hardening the layer afforded in step (b) to produce a photocatalytically active, porous, oxide-ceramic coating.
Use of highly disperse TiO2 produced by flame hydrolysis of TiO4 in an oxide-ceramic coating for roof tile, tile, clinker brick or a facade wall.
Dependencies are inferred from the claim text.