Undercoating layers providing improved photoactive topcoat functionality
View Patent ↗A coated article includes a substrate and a first coating formed over at least a portion of the substrate. The first coating includes a mixture of oxides including oxides of at least two of P, Si, Ti, Al and Zr. A photoactive functional coating is formed over at least a portion of the first coating. In one embodiment, the functional coating includes titania.
1. A coated article, comprising:
a substrate;
a first coating formed over at least a portion of the substrate, the first coating comprising a mixture of at least two oxides selected from the group consisting of oxides of P, Si, Ti, Al and Zr; and
a photoactive coating formed over at least a portion of the first coating,
wherein the first coating is a multi-layer coating comprising:
a first layer comprising phosphorous oxide, silica and titania, with silica present in the range of 70-80 volume %;
a second layer comprising phosphorous oxide, silica and titania, with silica present in the range of 48-62 volume %; and
a third layer comprising phosphorous oxide, silica and titania, with silica present in the range of 70-80 volume %.
2. The article of claim 1 , wherein the first coating further comprises an oxide of Al.
3. The article of claim 1 , wherein the photoactive coating comprises titania.
4. The article of claim 3 , wherein the titania coating has a thickness of at least 10 nm.
5. The article of claim 3 , wherein the titania coating comprises at least one dopant selected from the group consisting of Ag + and Sn +2 .
6. The article of claim 1 , wherein the article has a color in the range of −10≦a*≦2 and −15≦b*≦0.
7. The article of claim 6 , wherein the article has an a* in the range of −8 to −4.4, a b* in the range of −12.6 to −5.2, and an L* in the range of 50.5 to 52.3.
8. A coated article, comprising:
a substrate;
a first coating formed over at least a portion of the substrate, the first coating comprising a mixture of oxides comprising oxides of at least two of P, Si, Ti, Al and Zr; and
a photoactive coating formed over at least a portion of the first coating,
wherein the first coating is a multi-layer coating comprising:
a first layer comprising 5-10 volume % phosphorous oxide, 70-80 volume % silica and 10-25 volume % titania with a thickness in the range of 11 nm to 29 nm;
a second layer comprising 2 volume % phosphorous oxide, 48-62 volume % silica and 36-50 volume % titania with a thickness in the range of 21 nm to 33 nm; and
a third layer comprising 5-11 volume % phosphorous oxide, 70-80 volume % silica and 9-25 volume % titania with a thickness in the range of 15 nm to 23 nm.
9. A photoactive article, comprising:
a glass substrate;
a first coating formed over at least a portion of the substrate, the first coating comprising a mixture of silica, titania and alumina; and
a photoactive functional coating comprising titania formed over at least a portion of the first coating,
wherein the first coating is a multi-layer coating comprising:
a first layer comprising phosphorous oxide, silica and titania, with titania present in the range of 10-25 volume %;
a second layer comprising phosphorous oxide, silica and titania, with titania present in the range of 36-50 volume %; and
a third layer comprising phosphorous oxide, silica and titania, with titania present in the range of 9-25 volume %.