Solar control coatings with discontinuous metal layer
An architectural transparency includes a substrate, a first dielectric layer formed over at least a portion of the substrate, a continuous metallic layer formed over at least a portion of the first dielectric layer, a second dielectric layer formed over at least a portion of the first metallic layer, and a subcritical metallic layer formed over at least a portion of the second dielectric layer such that the subcritical metallic layer forms discontinuous metallic regions.
1. A coated article, comprising:
a substrate; and
a coating over at least a portion of the substrate, the coating comprising:
a first dielectric layer formed over at least a portion of the substrate and comprising a zinc oxide layer over a zinc stannate layer;
a first, continuous metallic silver layer comprising silver over the first dielectric layer;
a first primer layer over the first continuous metallic silver layer, the first primer comprising titanium;
a second dielectric layer over the first primer layer comprising a zinc stannate layer over a zinc oxide layer;
a second, discontinuous metallic silver layer over the second dielectric layer;
a second primer over the second discontinuous metallic silver layer and comprising a nickel-chromium alloy;
a third dielectric layer over the second primer layer and comprising a zinc oxide layer, a zinc stannate layer, and another zinc oxide layer;
a third continuous metallic silver layer over the third dielectric layer;
a third primer layer comprising titanium over the third continuous metallic silver layer;
a fourth dielectric layer comprising a zinc stannate layer over a zinc oxide layer over the third primer layer; and
a protective coating comprising titania over the fourth dielectric coating.
2. The article of claim 1 , wherein the second, discontinuous silver layer has an effective thickness of less than 50 Å.
3. The article according to claim 1 , wherein the first dielectric layer further comprises a second zinc oxide layer over the zinc stannate layer.
4. The article according to claim 1 , wherein the effective thickness of the second, discontinuous silver layer is in the range of 25 to 30 Å.
5. The article of claim 1 wherein the second primer has a thickness in the range of 5 Å to 50 Å.
6. The article of claim 1 wherein the second, discontinuous silver layer has a thickness of less than 50 Å.
7. The article of claim 1 , wherein the second, discontinuous silver layer has a thickness in the range of 25 Å to 50 Å.
8. The article according to claim 1 , wherein the second dielectric layer further comprises a second zinc oxide layer over the zinc stannate layer.