Glass panel having sun-shielding properties

Patent metadata

Field	Value
Publication number	US-9354368-B2
Application number	US-201113814754-A
Country	US
Kind code	B2
Filing date	Jul 22, 2011
Priority date	Aug 10, 2010
Publication date	May 31, 2016
Grant date	May 31, 2016

Abstract

The invention relates to solar-control glazing comprising a glass substrate and a solar-control thin-film multilayer, said thin-film multilayer incorporating a film selectively absorbing infrared radiation having a wavelength longer than 800 nm, said absorbing film consisting of a titanium oxide substituted with an element X chosen from Nb or Ta, the atomic percentage [X/Ti+X] lying between about 4% and about 9% and the thickness of said absorbing film lying between about 20 and about 200 nanometers.

First claim

The invention claimed is:

1. An automotive or architectural solar-control glazing, comprising:
a glass substrate; and
a solar-control thin-film multilayer comprising, in succession from a surface of the glass substrate:
at least one lower protective film, which protects the absorbing film from migration of alkali-metal ions from the glass substrate, the lower film(s) having a total geometrical thickness of between 5 and 150 nm,
an absorbing film, which selectively absorbs infrared radiation having a wavelength longer than 800 nm, the absorbing film having a total geometrical thickness of between about 20 nanometers and about 200 nanometers, and
at least one upper protective film, which protects the absorbing film from oxygen in the air, the upper film(s) having a total geometrical thickness of between 5 and 150 nm,

wherein the absorbing film consists of a titanium oxide substituted with a dopant element, X, which is Nb or Ta, wherein an atomic percentage, [X/Ti+X], is between about 4% and about 9%,
wherein the glazing acts on solar radiation to protect and/or thermally insulate a passenger compartment of an automotive or a dwelling, and
wherein the solar-control thin-film multilayer does not comprise a silver type film.

2. The glazing of claim 1 , wherein the atomic percentage, [X/Ti+X], is between about 4% and about 7%.

3. The glazing of claim 1 , wherein the thickness of the absorbing film is between 30 and 100 nanometers.

4. The glazing of claim 1 , wherein X is niobium.

5. The glazing of claim 1 , wherein the lower and upper protective films each independently comprise: silicon nitride (Si 3 N 4 ) optionally doped with Al, Zr, or B; aluminum nitride (AlN); tin oxide; a mixed tin zinc oxide (Sn y Zn z O x ); silicon oxide (SiO 2 ); undoped titanium oxide (TiO 2 ); or a silicon oxynitride (SiO x N y ).

6. The glazing of claim 1 , wherein the multilayer further comprises:
a first metal film between the lower protective film and the absorbing film; and
a second metal film between the upper protective film and the absorbing film;
wherein the first and second metal films are optionally partially or completely oxidized, nitrided, or a combination thereof, and
wherein the first and second metal films each have a thickness of less than 5 nm.

7. The glazing of claim 6 , wherein the metal of the first and second metal films is Ti or a NiCr alloy.

8. The glazing of claim 1 , wherein the multilayer comprises in succession from a surface of the glass substrate:
the lower protective film, which is: silicon nitride (Si 3 N 4 ) optionally doped with Al, Zr, or B; aluminum nitride (AIN); tin oxide; a mixed tin zinc oxide (Sn y Zn z O x ); silicon oxide (SiO 2 ); undoped titanium oxide (TiO 2 ); or a silicon oxynitride (SiO x N y );
the absorbing film, which is a titanium oxide substituted with Nb, wherein the atomic percentage, [Nb/Ti+Nb], in the absorbing film is between about 4% and about 7% and the thickness of the absorbing film is between 30 and 100 nm;
the upper protective film, which is: silicon nitride (Si 3 N 4 ) optionally doped with Al, Zr, or B; aluminum nitride (AIN); tin oxide; a mixed tin zinc oxide (Sn y Zn z O x ); silicon oxide (SiO 2 ); undoped titanium oxide (TiO 2 ); or a silicon oxynitride (SiO x N y ).

9. The glazing of claim 1 , wherein the multilayer comprises in succession from a surface of the glass substrate:
the lower protective film, which is an Si 3 N 4 protective film having a thickness between 5 and 100 nm;
a first titanium metal film, which is partially or completely oxidized, nitrided, or a combination thereof, wherein a geometrical thickness of the first titanium metal film is less than 2 nm;
the absorbing film, which absorbs infrared radiation and is a titanium oxide substituted with Nb, the atomic percentage [Nb/Ti+Nb] in the absorbing film lying between about 4% and about 7%, wherein the thickness of the absorbing film is between 30 and 100 nm;
a second titanium metal film, which is partially or completely oxidized, nitrided, or a combination thereof, wherein a geometrical thickness of the second titanium metal film is less than 2 nm; and
the upper protective film, which is an Si 3 N 4 protective film having a thickness between 5 and 100 nm.

10. A method for manufacturing the glazing of claim 1 , the method comprising:
manufacturing a glass substrate; and
depositing a thin-film multilayer on the glass substrate with a vacuum magnetron sputtering technique,
wherein the absorbing film is obtained by sputtering a target comprising a titanium oxide substituted with the dopant element, X, wherein the atomic percentage [X/Ti+X] is between about 4% and about 9%, in a residual atmosphere of argon or a mixture of argon and oxygen.

11. A method for manufacturing the glazing of claim 1 , the method comprising:
manufacturing a glass substrate; and
depositing a thin-film multilayer on the glass substrate with a vacuum magnetron sputtering technique,
wherein the absorbing film is obtained by sputtering a target comprising a mixture of titanium metal and the metal X, which is Nb or Ta, wherein the atomic percentage, [X/Ti+X], in the target is between about 4% and about 9%, in a residual atmosphere of oxygen and argon.

12. The glazing of claim 6 , wherein the first and second metal films each have a thickness of less than 3 nm.

13. The glazing of claim 8 , further comprising, between the lower protective film and the absorbing film:
a first titanium metal film optionally partially or completely oxidized, nitrided, or a combination thereof,
wherein the first titanium metal film has a thickness of less than 2 nm.

14. The glazing of claim 13 , further comprising, between the upper protective film and the absorbing film:
a second titanium metal film optionally partially or completely oxidized, nitrided, or a combination thereof,
wherein the second titanium metal film has a thickness of less than 2 nm.

Assignees

• Mauvernay Bruno
• Charlet Emilie
• Singh Laura Jane
• Poirot Charlotte
• Saint Gobain

Inventors

• Mauvernay Bruno
• Charlet Emilie
• Singh Laura Jane
• Poirot Charlotte

Classifications

• C03C17/36

  at least one coating being a metal · CPC title

• B32B17/061

  of metal · CPC title

• B32B17/00

  Layered products essentially comprising sheet glass, or glass, slag, or like fibres · CPC title

• C03C17/00

  Surface treatment of glass, not in the form of fibres or filaments, by coating (optical coatings of optical elements G02B1/10) · CPC title

• C03C17/3602

  the metal being present as a layer · CPC title