Grey glass composition including erbium, neodymium and/or praseodymium
View Patent ↗A grey glass composition is suitable for architectural and/or vehicle window applications. The grey glass may achieve a combination of good visible transmission, a low SHGC, and desirable coloration. In certain example embodiments, the grey glass includes iron, erbium (Er), neodymium (Nd) and/or praseodymium (Pr) in the colorant portion of the glass.
1. A grey glass comprising:
a base glass portion comprising:
Ingredient
wt. %
SiO 2
67-75%
Na 2 O
10-20%
CaO
5-15%
MgO
0-7%
Al 2 O 3
0-7%
K 2 O
0-5%
BaO
0-1%
and a colorant portion consisting essentially of:
Ingredient
wt. %
total iron:
0.20-0.80%
erbium oxide:
0.01-1.0%
neodymium oxide:
0.001-1.0%
praseodymium oxide:
0.001-1.0%
nickel oxide:
0 to 0.5%
selenium:
0.0-0.03%
cobalt oxide:
0.001-0.2%
wherein the grey glass has a dominant wavelength in the range of from 435 nm to 570 nm.
2. The glass of claim 1 , wherein the glass has an excitation purity (Pe) of no greater than about 4.5%.
3. The glass of claim 2 , wherein said dominant wavelength and excitation purity are measured at a nominal thickness of the glass of from about 3 mm to 4 mm.
4. The glass of claim 1 , wherein the glass is substantially free of cerium.
5. The glass of claim 1 , further comprising a redox value FeO/Fe 2 O 3 of from 0.09 to 0.50.
6. The glass of claim 1 , wherein the glass has a visible transmission Lta of at least about 55%.
7. The glass of claim 1 , wherein the colorant portion includes at least twice as much total iron as erbium oxide.
8. A grey glass comprising:
a base glass portion comprising:
Ingredient
wt. %
SiO 2
67-75%
Na 2 O
10-20%
CaO
5-15%
MgO
0-7%
Al 2 O 3
0-7%
K 2 O
0-5%
BaO
0-1%
and a colorant portion comprising:
Ingredient
wt. %
total iron:
0.20-0.80%
erbium oxide:
0.01-1.0%
neodymium oxide:
0.001-1.0%
praseodymium oxide:
0.001-1.0%
nickel oxide:
0 to 0.5%
selenium:
0.0-0.03%
cobalt oxide:
0.001-0.2%
wherein the grey glass has a dominant wavelength in the range of from 435 nm to 570 nm.
9. The glass of claim 8 , wherein the glass has an excitation purity (Pe) of no greater than about 4.5%.
10. The glass of claim 9 , wherein said dominant wavelength and excitation purity are measured at a nominal thickness of the glass of from about 3 mm to 4 mm.
11. The glass of claim 8 , wherein the glass is substantially free of cerium.
12. The glass of claim 8 , further comprising a redox value FeO/Fe 2 O 3 of from 0.09 to 0.50.
13. The glass of claim 8 , wherein the glass has a visible transmission Lta of at least about 55%.
14. The glass of claim 8 , wherein the colorant portion includes at least twice as much total iron as erbium oxide.
15. A grey glass comprising:
a base glass portion comprising:
Ingredient
wt. %
SiO 2
67-75%
Na 2 O
10-20%
CaO
5-15%
MgO
0-7%
Al 2 O 3
0-7%
K 2 O
0-5%
BaO
0-1%
and a colorant portion comprising:
Ingredient
wt. %
total iron:
0.20-0.80%
erbium oxide:
0.0-1.0%
neodymium oxide:
0.001-1.0%
praseodymium oxide:
0.001-1.0%
nickel oxide:
0 to 0.5%
selenium:
0.0-0.03%
cobalt oxide:
0.001-0.2%
wherein the grey glass has a dominant wavelength in the range of from 435 nm to 570 nm and an excitation purity (Pe) of no greater than about 4.5%.