Saint-gobain Glass France

Lars Ihlo

Uwe Schmidt

Heinz Schicht

Herbert Schindler

Ralf Comtesse

In a heat-resistant low-emissivity (low-E) multilayer system that includes a silver layer as functional layer, for transparent substrates, in particular for window panes, which has, between the surface of the substrate and the silver layer, a high-refringence layer, in particular made of TiO, NbOor TiNbO, and, immediately below the silver layer, a layer essentially consisting of ZnO, a mixed oxide layer with a thickness of at least 0.5 nm, made of NiCrOor InSnO(ITO) that serves as antiscattering layer is placed between the high-refringence layer and the ZnO layer.

Low emissivity (low-E) thin coating stacks with intermediate antidiffusion layers

A multilayer film, capable of withstanding high thermal stresses, with silver as functional layer, a sacrificial metal layer placed on top of the silver layer and antireflection dielectric layers, has a metal nitride layer between the silver layer and the sacrificial metal layer. This metal nitride layer is composed in particular of SiNand/or AlN and constitutes an effective diffusion barrier. The optical and energy properties of the silver layer consequently remain, for the most part, preserved, even after undergoing high thermal stresses (for example of the bending or toughening type when curving and/or prestressing a window pane provided with the multilayer film).

Prestressable low-E layer systems for window panes

A low-emissivity multilayer system, capable of being bent and prestressed, for glazing panes, with silver as functional layer, comprises a sacrificial metal layer of Ti or an alloy of Ti and Zn and/or Al placed above the silver layer, antireflection dielectric layers and an oxide, nitride or oxynitride covering layer. The sacrificial metal layer contains chemically bonded hydrogen. An optionally Al- and/or In-doped ZnO layer is adjacent to the sacrificial metal layer. The covering layer consists of a titanium compound. Multilayer systems of this type can be manufactured relatively inexpensively and have a high hardness and a high chemical resistance. Their color parameters are very reproducible, even in the case of a heat treatment at high temperature.

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Pfluckuff, Germany

Lars Ihlo