Multilayer heat processable vacuum coatings with metallic properties
AssigneePPG Industries, Inc.
InventorsJames J. Finley, Mehran Arbab, Thomas J. Waynar
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Abstract
A temperable coated article with metallic properties is prepared by coating a glass substrate with a metal-containing film such as titanium nitride, which ordinarily oxidizes at high temperature, overcoating with a protective layer of a silicon compound which forms a durable layer and prevents oxidation of the underlying metal-containing film and undercoating with a stabilizing metal-containing layer. The coated article can be tempered without losing its metallic properties to oxidation.
Claims26
A method of making a tempered coated article having a metallic appearance comprising the steps of:
- depositing on a surface of a glass substrate a stabilizing metallic film selected from the group consisting of titanium, zirconium, tantalum, chromium, niobium, nickel-chromium alloys and aluminum nitride;
- depositing a metal compound film on the stabilizing film;
- depositing a protective layer comprising a silicon or silicon alloy dielectric over the metal compound film to prevent oxidation of the metal compound film upon heating;
- and
- heating the glass substrate having the stabilizing metallic film, the metal compound film and the protective layer defined as a coated substrate to a temperature sufficient to temper the glass substrate, to increase the transmission of the coated substrate in the wavelength range of 400-800 nanometers, to decrease solar transmission of the coated substrate in the wavelength range of 800 to 2100 nanometers and to oxidize the stabilizing metallic film.
The method according to claim 22, wherein said metal compound film is selected from the group consisting of metal borides, metal carbides and metal oxynitrides.
Dependencies are inferred from the claim text.