Coated article with IR reflecting layer and method of making same

• US 8,808,864 B2
• Filed: 03/08/2013
• Issued: 08/19/2014
• Est. Priority Date: 04/21/2008
• Status: Expired due to Fees

• Current Assignee: Guardian Glass LLC (KOCH Industries Incorporated)
• Original Assignee: Guardian Industries Corporation (KOCH Industries Incorporated)
• Inventors: Lao, Jingyu, Lingle, Philip J., Boyce, Brent, Disteldorf, Bernd, Blacker, Richard
• Primary Examiner(s): Sample, David
• Assistant Examiner(s): COLGAN, LAUREN ROBINSON
• Application Number:
  US13/790,052
• Publication Number:
  US 20130251923A1
• Time in Patent Office: 529 Days
• Field of Search: 428/426, 428/432, 428/433, 428/434, 428/688, 428/689, 428/699, 428/701, 428/702
• US Class Current: 428/432
• CPC Class Codes: B32B 17/06 comprising glass as the main or only constituent of a layer, next to another layer of a specific material
• CPC Class Codes: B32B 2255/20 Inorganic coating
• CPC Class Codes: B32B 2255/28 Multiple coating on one surface
• CPC Class Codes: B32B 2307/304 Insulating
• CPC Class Codes: B32B 2307/412 Transparent
• CPC Class Codes: B32B 2307/416 Reflective
• CPC Class Codes: C03C 17/2453 Coating containing SnO2
• CPC Class Codes: C03C 17/3435 comprising a nitride, oxynitride, boronitride or carbonitride
• CPC Class Codes: C03C 17/36 at least one coating being a metal
• 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 17/3634 one layer at least containing carbon, a carbide or oxycarbide
• 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 17/366 Low-emissivity or solar control coatings
• CPC Class Codes: C03C 17/3681 the multilayer coating being used in glazing, e.g. windows or windscreens
• CPC Class Codes: C03C 2217/21 Oxides
• CPC Class Codes: C03C 2217/211 SnO2
• CPC Class Codes: C03C 2217/212 TiO2
• CPC Class Codes: C03C 2217/216 ZnO
• CPC Class Codes: C03C 2217/219 : CrOx, MoOx, WOx
• CPC Class Codes: C03C 2217/256 : Ag
• CPC Class Codes: C03C 2217/281 : Nitrides
• CPC Class Codes: C03C 2217/70 : Properties of coatings
• CPC Class Codes: C03C 2218/154 : by sputtering
• CPC Class Codes: C03C 2218/156 : by magnetron sputtering
• CPC Class Codes: C23C 14/0652 : Silicon nitride
• CPC Class Codes: C23C 14/086 : of zinc, germanium, cadmium, indium, tin, thallium or bismuth
• CPC Class Codes: E06B 2009/2417 : Light path control; means to control reflection
• CPC Class Codes: E06B 3/6715 : specially adapted for increased thermal insulation or for controlled passage of light E06B3/66323 takes precedence; coating of glass pains C03C17/00; devices or arrangements for controlling the intensity, colour, phase, polarisation or direction of light G02F1/00
• CPC Class Codes: E06B 9/24 : Screens or other constructions affording protection against light, especially against sunshine; Similar screens for privacy or appearance; Slat blindsoperating, guiding or securing devices or arrangements for roll-type closures E06B9/56; free-hanging flexible screens A47H23/00
• CPC Class Codes: Y10T 428/265 : 1 mil or less

Abstract

An IG window unit includes a coating supported by a glass substrate. The coating includes at least the following on the glass substrate moving from the glass substrate outwardly: at least one dielectric layer; a layer comprising zinc oxide; an infrared (IR) reflecting layer comprising silver; a layer comprising an oxide of Ni and/or Cr; an overcoat comprising a layer comprising tin oxide located over the oxide of Ni and/or Cr and a layer comprising silicon nitride.

Claims

1. An IG window unit including a coating supported by a glass substrate, the coating from the glass substrate outwardly comprising:

at least one dielectric layer;

a layer comprising zinc oxide over the at least one dielectric layer;

an infrared (IR) reflecting layer comprising silver on the glass substrate, located over and directly contacting the layer comprising zinc oxide, wherein the coating includes only one IR reflecting layer;

a layer comprising an oxide of Ni and/or Cr located over and directly contacting the IR reflecting layer comprising silver;

an overcoat comprising (i) a layer comprising tin oxide located over the layer comprising the oxide of Ni and/or Cr and (ii) a layer comprising silicon nitride located over and contacting the layer comprising tin oxide, wherein in the overcoat the layer comprising tin oxide and the layer comprising silicon nitride have substantially equal thicknesses plus/minus 10% in order to improve thermal cycling performance and durability of the coating, and wherein the layer comprising tin oxide and the layer comprising the oxide of Ni and/or Cr in the overcoat has a thickness of from about 160-180 angstroms; and

wherein the IG unit has an SHGC value of at least 0.65, a visible transmission of at least 70%, and an Energy Rating of at least 25.

2. The IG unit of claim 1, wherein the IG unit has an SHGC value of at least 0.68, a visible transmission of at least 74.5%, and an Energy Rating of at least 29.

3. The IG unit of claim 1, wherein the IG unit has a U-value of no greater than 0.30 Btu/h ft F.

4. The IG unit of claim 1, wherein said glass substrate is an interior glass substrate, the IG unit further comprising an exterior glass substrate located adjacent an exterior of a building in which the IG unit is provided, wherein the coating is provided on a surface of the interior glass substrate facing a gap between the interior and exterior glass substrates, and wherein the IG unit has, as viewed from an exterior of the building, a reflective a* value of from about −

4 to 0 and a reflective b* value of from about −

1 to +2.5.