Method for the photocatalytically active coating of surfaces

Patent metadata

Field	Value
Publication number	US-9556508-B2
Application number	US-201214345992-A
Country	US
Kind code	B2
Filing date	Sep 18, 2012
Priority date	Sep 20, 2011
Publication date	Jan 31, 2017
Grant date	Jan 31, 2017

Abstract

A method for the photocatalytically active coating of surfaces is presented and described, as well as an article ( 1 ) photocatalytically actively coated according to this method. The object of providing a method for the photocatalytically active coating of, in particular, metallic surfaces, whereby a permanently stable coating is produced without negatively affecting the photocatalytic activity of the layer, is achieved by a method, in which a substrate article is prepared which has a surface, a metallic adhesion-promoting layer is applied to the surface of the substrate article, a photocatalytically active layer consisting of one or more metal oxides is applied to the adhesion-promoting layer, wherein the metallic adhesion-promoting layer and the surface of the substrate article consist of a different material and the adhesion-promoting layer is selected such that it is not oxidized or reduced by the photocatalytically active layer.

First claim

The invention claimed is:

1. Method for the photocatalytically active coating of surfaces, in which:
i) a substrate article ( 5 ) which has a surface ( 3 ) is prepared,
ii) a titanium-containing metallic adhesion-promoting layer ( 7 ) is applied to the surface ( 3 ) of the substrate article ( 5 ),
iii) a photocatalytically active layer ( 9 ) consisting of one or more titanium metal oxides is applied to the metallic adhesion-promoting layer ( 7 ) by cold gas spraying,
wherein the metallic adhesion-promoting layer ( 7 ) and the surface ( 3 ) of the substrate article ( 5 ) consist of different material.

2. Method according to claim 1 , wherein the photocatalytically active layer ( 9 ) is formed from a metal oxide selected from the group consisting of TiO 2 and SrTiO 3 .

3. Method according to claim 2 , wherein the photocatalytically active layer ( 9 ) is formed from titanium dioxide.

4. Method according to claim 3 , wherein the photocatalytically active layer ( 9 ) is formed from anatase.

5. Method according to claim 1 , wherein the substrate article ( 5 ) is selected from the series of sanitary, kitchen or medical articles, handholds, light switches, door handles, food belts, beverage filling plants, control elements, keyboards, and bedsteads.

6. Method according to claim 1 , wherein the cold spraying is conducted with a spray material which has a particle size with a cross-section of between 5 and 150 μm.

7. Method according to claim 1 , wherein the pressure for the cold spraying is 20 to 100 bar.

8. Method according to claim 1 , wherein the temperature for the cold spraying is 200 to 1200° C.

9. Photocatalytically actively coated article ( 1 ), which is obtained by a method according to claim 1 .

10. Method according to claim 1 , wherein the surface ( 3 ) of the substrate article ( 5 ) is a metallic surface.

11. Method according to claim 10 , wherein the adhesion-promoting layer ( 7 ) is applied to the surface ( 3 ) by means of a thermal spraying process selected from the series: cold gas spraying, HVOF spraying, plasma spraying, and suspension spraying; or by means of a galvanic process.

12. Method according to claim 10 , wherein the surface ( 3 ) of the substrate article ( 5 ) is formed from high-grade steel, aluminum or copper.

Assignees

• Linde Ag

Inventors

• Kliemann Jan-Oliver
• Gutzmann Henning
• Klassen Thomas
• Gaertner Frank

Classifications

• C23C4/02

  Pretreatment of the material to be coated, e.g. for coating on selected surface areas · CPC title

• B01J21/063

  Titanium; Oxides or hydroxides thereof · CPC title

• B01J37/348

  Electrochemical processes, e.g. electrochemical deposition or anodisation · CPC title

• C23C4/04

  characterised by the coating material · CPC title

• B01J37/0238

  via the gaseous phase-sublimation · CPC title