Coated glazing material
US5110662A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Dec 28, 1989 |
| Grant date | May 5, 1992 |
| Priority date | — |
| Expiry date | Dec 28, 2009 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T428/28
- WIPO fieldMaterials, metallurgy
- WIPO sectorChemistry
Abstract
A substrate of glazing material carries a multi-layer coating which comprises a reflective layer of silver sandwiched between a transparent undercoat and a transparent overcoat. The undercoat for the silver layer comprises at least one layer of a metal oxide selected from tin oxide, titanium dioxide, aluminium oxide, bismuth oxide and a mixture of two or more thereof, over which is deposited a layer of zinc oxide having a thickness not greater than 15 nm. The overcoat for the silver layer comprises a layer of an oxide of a sacrificial metal selected from the group consisting of titanium, aluminium, stainless steel, bismuth, tin and mixtures of two or more thereof, which is formed by initial deposition of the sacrificial metal and its conversion to oxide. For forming a low emissivity coating with good light transmission, the silver layer is 8 to 12 nm thick. A specific multi-layer low emissivity coating is formed by depositing the following layers, starting from the substrate surface: PA1 Undercoat PA2 3 nm titanium dioxide PA2 20 nm tin oxide (SnO2) PA2 13 nm zinc oxide PA1 Reflective layer PA2 10 nm silver PA1 Overcoat PA2 3.5 nm titanium for conversion to titanium dioxide PA2 22 …
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.