Heat temperable transparent glass article

• US 6,060,178 A
• Filed: 05/30/1997
• Issued: 05/09/2000
• Est. Priority Date: 06/21/1996
• Status: Expired due to Term

• Current Assignee: Cardinal CG Company (Cardinal Glass Industries Incorporated)
• Original Assignee: Cardinal IG Company (Cardinal Glass Industries Incorporated)
• Inventors: Krisko, Annette J.
• Primary Examiner(s): TURNER, ARCHENE A
• Application Number:
  US08/866,529
• Time in Patent Office: 1,075 Days
• Field of Search: 428/428, 428/426, 428/432, 428/216, 428/212, 428/336, 428/701, 428/702, 428/469, 428/472, 428/621, 428/632, 428/629, 428/622, 428/627
• US Class Current: 428/627
• CPC Class Codes: C03C 17/36 at least one coating being a metal
• CPC Class Codes: C03C 17/3615 Coatings of the type glass/metal/other inorganic layers, at least one layer being non-metallic
• CPC Class Codes: C03C 17/3618 Coatings of type glass/inorganic compound/other inorganic layers, at least one layer being metallic
• CPC Class Codes: C03C 17/3626 one layer at least containing a nitride, oxynitride, boronitride or carbonitride
• CPC Class Codes: C03C 17/3639 Multilayers containing at least two functional metal layers
• CPC Class Codes: C03C 17/3644 the metal being silver
• CPC Class Codes: C03C 17/3652 the coating stack containing at least one sacrificial layer to protect the metal from oxidation
• CPC Class Codes: C03C 17/3681 the multilayer coating being used in glazing, e.g. windows or windscreens
• CPC Class Codes: C03C 17/3686 the multilayer coating being used for ovens
• CPC Class Codes: C03C 2218/365 Coating different sides of a glass substrate
• CPC Class Codes: Y10T 428/12535 with additional, spatially distinct nonmetal component
• CPC Class Codes: Y10T 428/12542 More than one such component
• CPC Class Codes: Y10T 428/12576 Boride, carbide or nitride component
• CPC Class Codes: Y10T 428/1259 Oxide
• CPC Class Codes: Y10T 428/12611 Oxide-containing component
• CPC Class Codes: Y10T 428/24942 including components having same physical characteristic in differing degree
• CPC Class Codes: Y10T 428/24975 No layer or component greater than 5 mils thick
• CPC Class Codes: Y10T 428/265 1 mil or less

Abstract

A heat-resistant transparent glass article is formed with a film stack deposited on a glass substrate, the film stack comprising one or more infrared reflective films each bearing on its surface facing away from the substrate a barrier film of niobium metal having a thickness of up to 25 Å and preferably in the range of about 7 Å to 20 Å. A barrier film of niobium metal or, preferably, a metal oxide may be formed on the other surface (facing the substrate) of each infrared reflective film. Metal nitride films such as silicon nitride may be employed between neighboring infrared reflective films, and as an outer protective film.

Claims

1. A heat-resistant, temperable glass article comprising a glass substrate and a transparent film stack deposited upon the substrate, said film stack comprising, from the glass substrate outwardly, an infrared reflective metallic film, a protective barrier film of niobium metal deposited directly on the infrared reflective film at a thickness up to 25 Å

such that a thin protective film of niobium remains after heat-tempering of the glass article, a film of titanium nitride, and a film of a transparent nitride.

2. The glass article of claim 1 wherein said infrared reflective metallic film is silver.

3. The glass article of claim 1 including a second niobium metal barrier film between said infrared reflective film and the glass substrate and contiguous to the infrared reflective film.

4. The glass article of claim 1 including a metal oxide barrier film between said infrared reflective film and the glass substrate and contiguous to the infrared reflective film.

5. A heat-resistant, temperable glass article comprising a glass substrate and a film stack deposited upon the substrate, said film stack comprising, from the glass substrate outwardly, a metal oxide barrier film, an infrared reflective silver-containing metallic film, a barrier film of niobium metal, a film of titanium nitride, and a film of a transparent nitride, the metal oxide and niobium barrier films being contiguous to the infrared reflective silver film, and the niobium barrier film having a thickness in the range of 7 to 20 Å

.

6. The article of claim 5 including a transparent nitride film positioned nearer the said glass substrate than the first barrier film.

7. The transparent heat-resistant glass article of claim 5 wherein said metal oxide barrier film comprises an oxide of a metal selected from the group consisting of zinc, titanium, niobium and aluminum.

8. The transparent heat-resistant glass article of claim 6 including a transparent nitride film nearer the glass substrate than said silver film and separated from the silver film by a sufficient thickness of said metal oxide barrier film as to protect the infrared reflective metallic film from degradation at glass tempering temperatures.

9. The transparent heat-resistant glass article of claim 8 wherein said metal oxide barrier film is present in a thickness ranging from 25 Å

to 180 Å

.

10. The transparent heat resistant glass article of claim 5 wherein said metal oxide film is contiguous to the glass substrate and is of a thickness in the range of 100 Å

to 250 Å

.

11. A transparent heat-resistant glass article comprising a glass substrate and a transparent film stack deposited upon the substrate, said film stack comprising a plurality of transparent silicon nitride films, an infrared reflective film positioned between neighboring transparent nitride films, a film of niobium metal 7-20 Å

in thickness positioned on the surface of each infrared reflective film facing away from the substrate, a metal oxide film positioned between each transparent silicon nitride film and each infrared reflective film, and a film of titanium nitride between the silicon nitride film furthest from the substrate and the next adjacent niobium barrier film.

12. A transparent heat-resistant glass article comprising a glass substrate and a transparent film stack deposited upon the substrate, said film stack comprising, from the glass substrate outwardly, a first Si₃ N₄ film 100-400 Å

in thickness, a second Si₃ N₄ film 100-800 Å

in thickness, and a third Si₃ N₄ film 50-300 Å

in thickness, an infrared reflective silver film between the first and second Si₃ N₄ films and between the second and third Si₃ N₄ films, a film of niobium metal 7-20 Å

in thickness positioned on the surface of each infrared reflective film facing away from the glass substrate, and a film of titanium nitride between the silicon nitride film furthest from the substrate and the next adjacent niobium barrier film.

13. The transparent heat-resistant glass article of claim 12 including a protective zinc oxide film positioned between the first Si₃ N₄ film and the next adjacent infrared reflective silver film and between the second Si₃ N₄ film and the next adjacent infrared reflective silver film.

14. A transparent heat-resistant glass article comprising a glass substrate and a transparent film stack deposited upon the substrate, said film stack comprising, from the glass substrate outwardly, a transparent silicon nitride film having a thickness of from 125 Å

to 500 Å

, a first protective film of niobium metal 7 to 20 Å

in thickness, a transparent infrared reflective silver film, a second protective film of niobium metal 7 to 20 Å

in thickness, a transparent titanium nitride film, and a transparent silicon nitride film having a thickness of from 350 Å

to 600 Å

.

15. A transparent heat-resistant glass article comprising a glass substrate and a transparent film stack deposited upon the substrate, said film stack comprising a film of silver contiguous to and sandwiched between protective niobium metal films that are 7 Å

to 20 Å

in thickness;

on each side of said sandwich structure, a transparent film capable of liberating nitrogen upon being heated to glass tempering temperatures; and

a titanium nitride film disposed between one of said protective niobium metal films and the next adjacent transparent film capable of liberating nitrogen.

16. A transparent heat-resistant glass article comprising a glass substrate and a transparent film stack deposited upon the substrate, said film stack, from the glass substrate outwardly, including a film sequence comprising a metal oxide barrier film, a transparent infrared reflective silver film, a niobium metal barrier film 7 Å

to 20 Å

in thickness, a metal oxide film, and a film of transparent silicon nitride, and a repeat of said film sequence, and a film of titanium nitride being disposed between the silicon nitride film furthest from the substrate and the next adjacent metal oxide film.