Triple-Silver Low-Emissivity Coating for Infrared Reflection and Durability

The patent employs a composite coating structure consisting of multiple layers including silver films, dielectric films, and specifically introduces oxide barrier layers (such as titanium oxide, zinc oxide, or indium oxide) between the silver layers and the outer dielectric layers. This composite structure allows the coating to simultaneously achieve high infrared reflection from the silver layers while the oxide barrier layers prevent oxidation and enhance durability, resolving the contradiction between improved infrared reflection and maintained durability.

The patent optimizes the thickness parameters of each layer in the coating stack. By precisely controlling the thickness of silver films (typically 50-200 nm), dielectric layers, and oxide barrier layers, the coating achieves optimal balance between infrared reflection and visible transmission. The parameter optimization allows triple-silver coatings to provide superior thermal insulation while maintaining acceptable visible light transmission through careful tuning of layer thicknesses.

The patent divides the coating into distinct functional segments: inner dielectric layers adjacent to the glass substrate, oxide barrier layers, silver reflective layers, additional oxide barrier layers, and outer dielectric layers. This segmentation allows each layer to perform its specific function optimally while simplifying the overall manufacturing process by treating each segment as a separate deposition unit in the sputtering chamber sequence.