Hard, scratch-resistant coatings for substrates
US6652974B1 · kind B1 · utility
Assignee
Inventor
Key dates
| Filing date | Mar 6, 2002 |
| Grant date | Nov 25, 2003 |
| Priority date | — |
| Expiry date | Mar 6, 2022 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T428/8305
- WIPO fieldMaterials, metallurgy
- WIPO sectorChemistry
Abstract
A transparent, scratch-resistant, amorphous, easily washed coating on a transparent substrate, together with a method for its preparation. A substrate such as glass is introduced into a sputtering chamber, a silicon-containing target is sputtered in an atmosphere comprising nitrogen and a hydrocarbon gas to produce on the substrate a film containing a carbide of silicon and a nitride of silicon. The film preferably has a thickness in the range of about 30 å to about 500 å, and its surface preferably exhibits a contact angle with water below about 25°. The protective coating may be applied directly to a transparent substrate such as glass, or may be applied as a protective coating over an optical film stack carried by the substrate. If desired, a glass substrate may be coated on one side with the optical film stack and coated on the opposite side with the protective coating.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.