C - Chemistry – Metallurgy – 03 – C
Patent
C - Chemistry, Metallurgy
03
C
C03C 17/36 (2006.01)
Patent
CA 2647412
A highly heat-resistant low-emissivity multilayer system for transparent substrates, and in particular for glass panes, comprises, starting from the substrate, at least: a lower antireflection coating, consisting of several partial layers and including a layer essentially consisting of ZnO to which a silver-based functional layer is adjacent; an essentially metallic blocking layer located on top of the silver-based layer; an upper antireflection coating, consisting of several partial layers; and a top coating, possibly consisting of several partial layers. The upper antireflection coating comprises: a partial layer made of ZnO or a ZnMeOx mixed oxide that contains ZnO or a succession of layers of mixed oxides of the ZnO: Al/ZnMeOx type; a partial layer made of Si3N4 or SixOyNz; and, between these two partial layers, a separating layer with a thickness of 0.5 to 5 nm, consisting of a metal oxide or a mixed oxide with a cubic crystal lattice, which prevents direct contact between these two partial layers. The intermediate separating layer according to the invention makes it possible for the mechanical and chemical properties of the multilayer system to be further improved and for the coated glass panes obtained to be highly resistant to technical manipulation.
Un système de couches à faible émissivité et à haute tenue au traitement thermique pour substrats transparents comprend un revêtement antireflet inférieur constitué de plusieurs couches partielles et comportant une couche essentiellement constituée de ZnO à laquelle est adjacente une couche fonctionnelle à base d'argent, une couche essentiellement métallique de blocagesur la couche à base d'argent, un revêtement antireflet supérieur constitué de plusieurs couches partielles et un revêtement de recouvrement éventuellement constituée de plusieurs couches partielles. Le revêtement antireflet supérieur présente : une couche partielle en ZnO ou en un oxyde mixte ZnMeOx qui contient du ZnO ou une succession de couches d'oxydes mixtes de type ZnO: Al / ZnMeOx, -une couche partielle en Si3N4 ou en SixOyNz et entre ces deux couches partielles une couche de séparation d'une épaisseur de 0,5 à 5 nm, constituée d'un oxyde métallique ou d'un oxyde mixte à réseau cristallin cubique, qui empêche un contact direct entre ces deux couches partielles; cette couche améliore les propriétés mécaniques du revêtement.
Gillet Pierre-Alain
Schicht Heinz
Schmidt Uwe
Goudreau Gage Dubuc
Saint-Gobain Glass France
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