Grey glass composition
View Patent ↗A grey glass composition employing in its colorant portion, in certain example embodiments, iron, cobalt, nickel, and at least one of erbium and titanium. The use of erbium and/or titanium has been found to improve coloration of the grey glass, and improve tunability of the same. In certain example embodiments, the ratio of cobalt oxide to nickel oxide is from 0.22 to 0.30 in order to achieve desired coloration in certain example embodiments.
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
0-7%
and a colorant portion consisting essentially of:
total iron (expressed as Fe 2 O 3 )
0.15 to 0.45%
selenium
<=3
ppm
chromium oxide
1-20
ppm
cobalt oxide
130-240
ppm
nickel oxide
500-1,000
ppm
titanium oxide
0 to 0.20%
wherein the grey glass has a redox value (FeO/Fe 2 O 3 ) of from about 0.20 to 0.40, a visible transmission of from about 8-25%, an x color value of from 0.284 to 0.300, a y color value of from 0.300 to 0.327, and a dominant wavelength of from 435-570 nm;
wherein a ratio of cobalt oxide/nickel oxide is from 0.22 to 0.30; and
wherein the grey glass includes erbium oxide from 0.1 to 0.8%.
2. The glass of claim 1 , wherein the glass comprises erbium oxide from 0.2 to 0.7%.
3. The glass of claim 1 , wherein the glass comprises TiO 2 from 0.01 to 0.20%.
4. The glass of claim 1 , wherein the glass comprises TiO 2 from 0.02 to 0.05%.
5. The glass of claim 1 , wherein the glass has a visible transmission of from 12-18%.
6. The glass of claim 1 , wherein the glass has an x color value of from 0.286 to 0.299, a y color value of from 0.304 to 0.323, and a dominant wavelength of from 470-510 nm.
7. The glass of claim 1 , wherein the glass has an x color value of from 0.290 to 0.297, and a y color value of from 0.310 to 0.322.
8. The glass of claim 1 , wherein the glass has a redox of from 0.26 to 0.30.
9. The glass of claim 1 , wherein the ratio of cobalt oxide/nickel oxide is from 0.24 to 0.29.
10. The glass of claim 1 , wherein the ratio of cobalt oxide/nickel oxide is from 0.25 to 0.28.
11. The glass of claim 1 , wherein the colorant portion consists essentially of, in addition to the erbium oxide:
total iron (expressed as Fe 2 O 3 )
0.2 to 0.4%
selenium
<=2
ppm
chromium oxide
2-10
ppm
cobalt oxide
150-210
ppm
nickel oxide
550-900
ppm.
12. The glass of claim 1 , wherein the glass is substantially free of cerium oxide, and includes less than 1 ppm of Se and/or no Se.
13. 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
0-7%
and a colorant portion comprising:
total iron (expressed as Fe 2 O 3 )
0.15 to 0.45%
selenium
<=3
ppm
chromium oxide
2-12
ppm
cobalt oxide
130-240
ppm
nickel oxide
500-1,000
ppm
titanium oxide
0 to 0.20%
wherein the grey glass has a visible transmission of from about 8-25%, an x color value of from 0.284 to 0.300, a y color value of from 0.300 to 0.327, and a dominant wavelength of from 435-570 nm; and
wherein the grey glass includes erbium oxide from 0.1 to 0.8%.
14. The glass of claim 13 , wherein a ratio of cobalt oxide/nickel oxide is from 0.22 to 0.30.
15. The glass of claim 13 , wherein the glass comprises erbium oxide from 0.2 to 0.7%.
16. The glass of claim 13 , wherein the glass comprises TiO 2 from 0.01 to 0.20%.
17. The glass of claim 13 , wherein the glass comprises TiO 2 from 0.02 to 0.05%.
18. The glass of claim 13 , wherein the glass has an x color value of from 0.286 to 0.299, a y color value of from 0.304 to 0.323, and a dominant wavelength of from 470-510 nm.
19. A grey glass comprising:
total iron (expressed as Fe 2 O 3 )
0.15 to 0.45%
selenium
<=3
ppm
chromium oxide
1-20
ppm
cobalt oxide
130-240
ppm
nickel oxide
500-1,000
ppm
titanium oxide
0 to 0.20%
wherein the grey glass has a visible transmission of from about 8-25%, an x color value of from 0.284 to 0.300, a y color value of from 0.300 to 0.327, and a dominant wavelength of from 435-570 nm;
wherein a ratio of cobalt oxide/nickel oxide is from 0.22 to 0.30; and
wherein the grey glass includes erbium oxide from 0.1 to 0.8%.