Process for producing a coating by cold gas spraying

Details Process for producing a coating by cold gas spraying Process for producing a coating by cold gas spraying

C - Chemistry, Metallurgy

23

C

C23C 24/04 (2006.01)

Patent

CA 2719545

The object of the invention is a method for producing a coating (20) through cold gas spraying. In the process, particles (19) according to the invention are used which contain a photocatalytic material (27). In order to improve the effect of this photocatalytic material (such as titanium dioxide), a reactive gas can be added to the cold gas stream (15), said reactive gas being activated by a radiation source not shown, for example by UV light, on the surface of the coating (20) that forms. This makes it possible to, for example, dose titanium dioxide with nitrogen. This allows the production of in situ layers having advantageously high catalytic effectiveness. The use of cold gas spraying has the additional advantage in that the coating (20) can be designed to contain pores (28) that enlarge the surface available for catalysis.

L'invention concerne un procédé pour former une couche (20) par projection dynamique à froid. Le procédé selon l'invention consiste à utiliser des particules (19) contenant un matériau photocatalytique (27). Pour améliorer l'effet de ce matériau photocatalytique (p. ex. dioxyde de titane) on peut ajouter au jet de gaz froid (15) un gaz réactif qui est activé par une source de rayonnement (non illustrée), par exemple de la lumière UV, sur la surface de la couche en formation (20). Il est ainsi possible de doper le dioxyde de titane avec de l'azote. Ceci permet la réalisation in situ de couches présentant un effet catalytique avantageusement élevé. L'utilisation de la projection dynamique à froid présente en outre l'avantage de permettre la formation d'une couche (20) présentant des pores (28), lesquels augmentent la surface disponible pour la catalyse.

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