Silver-Free Low-E Solar Control Coating

• US 20090197096A1
• Filed: 07/25/2006
• Published: 08/06/2009
• Est. Priority Date: 07/26/2005
• Status: Active Grant

• Current Assignee: Pilkington North America Incorporated (Pilkington PLC)
• Original Assignee: Pilkington North America Incorporated (Pilkington PLC)
• Inventors: Strickler, David A, Varanasi, Srikanth
• Granted Patent: US 7,875,357 B2
• Time in Patent Office: Days
• US Class Current: 428/432
• CPC Class Codes: C03C 17/3417 all coatings being oxide coatings
• CPC Class Codes: C03C 17/3435 comprising a nitride, oxynitride, boronitride or carbonitride

Abstract

A multi-layer, low-emissivity, solar control article comprises a dielectric substrate, a first dielectric metal oxide layer deposited on the substrate, a first highly conductive, silver-free metal oxide layer deposited on the first dielectric metal oxide, and a second dielectric metal oxide deposited on the first highly conductive, silver-free metal oxide layer. The aforementioned coating layer sequence may be repeated as necessary to achieve the desired properties. An iridescence suppressing interlayer may, optionally, be utilized in connection with the low-emissivity, solar control coating.

Claims

1. A low-emissivity, solar control coating deposited on a dielectric substrate, the coating comprising:

a first dielectric metal oxide layer deposited over the dielectric substrate;

a first highly conductive silver-free metal oxide layer deposited over the first dielectric metal oxide and having an electrical conductivity greater than 10,000 ohm<sup>−

1</sup> cm<sup>−

1</sup>;

a second dielectric metal oxide layer deposited over the highly conductive, silver-free metal oxide layer; and

wherein each dielectric metal oxide is chosen from the group consisting of oxides of tin, titanium, zinc, bismuth and alloys thereof.

2. The solar control coating defined in claim 1, wherein the first highly conductive metal oxide has an electrical conductivity greater than 50,000 ohm⁻

1 cm<sup>−

1</sup>.

3. The solar control coating defined in claim 1, wherein the dielectric material comprises Si₃N₄.

4. The solar control coating defined in claim 1, wherein the highly conductive silver-free metal oxide is chosen from the group consisting of oxides of rhenium, ruthenium, iridium, chromium, molybdenum and mixed oxides, CaRuO₃, SrRuO₃, SrVO₃, SrCrO₃, SrFeO₃, SrTiO₃, SrMoO₃, LaTiO₃, Sr₂VMoO₆, NiCo₂O₄, and Na_xWO₃.

5. The solar control coating defined in claim 1, wherein a second highly conductive silver-free metal oxide layer is deposited over the second dielectric metal oxide layer, and a third dielectric metal oxide layer is deposited over the second highly conductive silver-free metal oxide layer.

6. A coated glass article comprising:

a dielectric substrate;

a first dielectric metal oxide layer deposited on the dielectric substrate;

a first highly conductive silver free metal oxide layer deposited on the first dielectric metal oxide the highly conductive metal oxide so deposited having an electrical conductivity greater than 10,000 ohm<sup>−

1</sup> cm<sup>−

1</sup>; and

a second dielectric metal oxide layer deposited on the conductive, silver-free metal oxide layer;

wherein the coated glass article has an emissivity of 0.3, a visible light transmittance >

70%, and a total solar energy transmittance of <

60%.

7. The coated glass article defined in claim 6, wherein the emissivity is <

0.1.

8. The coated glass article defined in claim 6, wherein:

the first dielectric metal oxide layer comprises TiO₂;

the first highly conductive silver free metal oxide layer comprises ReO₃; and

the second dielectric metal oxide layer comprises TiO₂.

9. The coated glass article defined in claim 6, wherein:

the first dielectric metal oxide layer comprises SnO₂;

the first highly conductive silver free metal oxide layer comprises RuO₂; and

the second dielectric metal oxide layer comprises SnO₂.

10. The coated glass article defined in claim 6, wherein:

the first dielectric metal oxide layer comprises TiO₂;

the first highly conductive silver free metal oxide layer comprises RuO₂; and

the second dielectric metal oxide layer comprises TiO₂.