Method of making coated article with high visible transmission and low emissivity
View Patent ↗A coated article that can be used in applications such as insulating glass (IG) units, so that resulting IG units can achieve high visible transmission of at least 70% (e.g., when using clear glass substrates from 1.0 to 3.5 mm thick), combined with at least one of: (a) SHGC no greater than about 0.45, more preferably no greater than about 0.40; (b) SC no greater than about 0.49, more preferably no greater than about 0.46; (c) chemical and/or mechanical durability; (d) neutral transmissive color such that transmissive a* is from −5.0 to 0 (more preferably from −3.5 to −1.5), and transmissive b* is from −2.0 to 4.0 (more preferably from 1.0 to 3.0); and (e) neutral reflective color from the exterior of the IG unit (i.e., Rg/R out ) such that reflective a* is from −3.0 to 2.0 (more preferably from −2.0 to 0.5), and reflective b* is from −5.0 to 1.0 (more preferably from −4.0 to −1.0). In certain example non-limiting embodiments, coated articles herein comprise: substrate/TiO x /ZnO x /Ag/NiCrO x /SnO x /ZnO x /Ag/NiCrO x /SnO x /Si x N y .
1. A method of making a coated article, the method comprising:
providing a glass substrate;
using at least sputtering in forming at least the following layers on the glass substrate, from the glass substrate outwardly:
a) a layer comprising a metal oxide;
b) a layer comprising zinc oxide;
c) a layer comprising silver contacting the layer comprising zinc oxide b);
d) a layer comprising nickel chrome oxide contacting the layer comprising silver c);
e) a layer comprising tin oxide;
f) a layer comprising zinc oxide;
g) a layer comprising silver contacting the layer comprising zinc oxide f);
h) a layer comprising nickel chrome oxide; and
i) a layer comprising tin oxide;
wherein the coated article has a visible transmission of at least about 70% and the coating or layer system has a sheet resistance (R s ) of no greater than 5.0 ohms/square.
2. The method of claim 1 , wherein the coated article comprises an insulating glass (IG) window unit.
3. The method of claim 1 , wherein the coated article is not heat treated.
4. The method of claim 1 , further comprising forming a layer comprising silicon nitride over and contacting the layer comprising tin oxide i).
5. The method of claim 1 , wherein the layers are formed so as to have the following thicknesses:
a) 100-400 Å
b) 40-150 Å
c) 50-250 Å
d) 15-60 Å
e) <=1,000 Å
f) 40-150 Å
g) 50-250 Å
h) 15-60 Å
6. The method of claim 1 , wherein the coated article comprises an IG window unit and has the following characteristics:
a* t (transmissive): −5.0 to 0.0
b* t (transmissive): −2.0 to 4.0
R g Y (outside reflectance): 7 to 13%
a* g (outside reflective): −3.0 to 2.0
b* g (outside reflective): −5.0 to 1.0
SHGC: <=0.45
SC: <=0.49
T ultraviolet : <=0.36.
7. The method of claim 1 , wherein the coated article comprises an IG window unit and has the following characteristics:
a* t (transmissive): −3.5 to 1.5
b* t (transmissive): 1.0 to 3.0
R g Y (outside reflectance): 9 to 11%
a* g (outside reflective): −2.0 to 0.5
b* g (outside reflective): −4.0 to −1.0
SHGC: <=0.40
SC: <=0.46
T ultraviolet : <=0.33.