Process for producing a sol-gel-based absorber coating for...

C - Chemistry – Metallurgy – 23 – C

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C23C 18/02 (2006.01) F24J 2/48 (2006.01)

Patent

CA 2656046

Process for producing a solar absorber coating, which comprises the steps: coating of a substrate with a titanium precursor solution to produce a titanium dioxide layer by the sol-gel technique and heat treatment of the coated substrate to pyrolyse and crystallize the layer, characterized in that silver ions are added to the titanium precursor solution prior to coating in such an amount that the heat-treated layer has a proportion by mass of silver in the range from 10% to 80% and pyrolysis and crystallization of the layer are carried out with illumination of the layer with visible light.

La présente invention concerne un procédé de fabrication d'un revêtement absorbant les rayonnements solaires dont les étapes consistent : à recouvrir un substrat d'une solution précurseur au titane pour produire une couche d'oxyde de titane selon la technique sol-gel et à réaliser un traitement thermique du substrat recouvert afin de pyrolyser et de cristalliser la couche, caractérisé en ce que des ions argent sont mélangés avant le revêtement à la solution précurseur au titane en une quantité telle que la proportion massique d'argent de la couche après traitement thermique est comprise entre 10 % et 80 % et que la pyrolyse et la cristallisation de la couche sont réalisées en éclairant la couche avec de la lumière visible.

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