Glass sheet with high near-IR transmission and very low visible transmission
A glass sheet of silicate-type showing intrinsically a very low visible transmission with high IR transmission at wavelengths of interest (i.e., 850, 900 and 950 nm), and low amounts of Cr 6+ species, valuable within the context of autonomous cars, and in particular those fully integrating LiDAR systems. The glass sheet having a composition in a content expressed as weight percentages, by total weight of glass: Total iron (expressed as Fe 2 O 3 ) 0.04-1.7%, Chromium (expressed as Cr 2 O 3 ) 0.05-0.8%, Cobalt (expressed as Co) 0.03-0.175%, where: Cr 2 O 3 <1-5.5Co, and 0.5<Cr 2 O 3 /Fe 2 O 3 ≤1.2.
1. A glass sheet of silicate-type having a composition comprising, in a content expressed as weight percentages, by total weight of glass:
SiO 2
40-78%;
Al 2 O 3
0-18%;
B 2 O 3
0-18%;
Na 2 O
0-20%;
CaO
0-15%;
MgO
0-10%;
K 2 O
0-10%;
BaO
0-5%;
total iron (expressed as Fe 2 O 3 )
0.04-1.7%;
Chromium (expressed as Cr 2 O 3 )
0.05-0.8%; and
Cobalt (expressed as Co)
0.03-0.175%,
wherein
Cr 2 O 3 <1-5.5Co, and 0.5<Cr 2 O 3 /Fe 2 O 3 ≤1.2, and
the glass sheet has a T 850 higher than 80%.
2. The glass sheet according to claim 1 , wherein chromium-(expressed as Cr 2 O 3 ) ≤0.5%.
3. The glass sheet according to claim 1 wherein chromium (expressed as Cr 2 O 3 ) ≤0.3%.
4. The glass sheet according to claim 1 , wherein chromium (expressed as Cr 2 O 3 ) ≥0.1%.
5. The glass sheet according to claim 1 , wherein total iron (expressed as Fe 2 O 3 ) ≤1.2%.
6. The glass sheet according to claim 1 , wherein total iron (expressed as Fe 2 O 3 ) ≥0.08%.
7. The glass sheet according to claim 1 , wherein total iron (expressed as Fe 2 O 3 ) ≥0.1%.
8. The glass sheet according to claim 1 , wherein cobalt (expressed as Co) ≤0.12%.
9. The glass sheet according to claim 1 , wherein the composition further comprises an Fe 2+ content (expressed in the form of FeO) of less than 40 ppm.
10. The glass sheet according to claim 1 , wherein the glass sheet does not comprise nickel.
11. The glass sheet according to claim 1 , wherein Cr 2 O 3 /Fe 2 O 3 ≤1.
12. The glass sheet according to claim 1 , wherein Cr 2 O 3 /Fe 2 O 3 ≤0.8.
13. The glass sheet according to claim 1 , wherein the glass sheet has a TLD4 lower than 10%.
14. The glass sheet according to claim 1 , wherein the glass sheet has a T 850 higher than 85%.
15. A glass sheet of silicate-type having a composition comprising, in a content expressed as weight percentages, by total weight of glass:
SiO 2
40-78%;
Al 2 O 3
0-18%;
B 2 O 3
0-18%;
Na 2 O
0-20%;
CaO
0-15%;
MgO
0-10%;
K 2 O
0-10%;
BaO
0-5%;
total iron (expressed as Fe 2 O 3 )
0.04-1.7%;
Chromium (expressed as Cr 2 O 3 )
0.05-0.8%; and
Cobalt (expressed as Co)
0.03-0.175%,
wherein
the glass sheet does not comprise nickel, and
Cr 2 O 3 <1-5.5Co, and 0.5<Cr 2 O 3 /Fe 2 O 3 ≤1.2, and
wherein the glass sheet has a TLD4 lower than 7%.
16. The glass sheet according to claim 15 , wherein Cr 2 O 3 /Fe 2 O 3 ≤0.8.
17. A glass sheet of silicate-type having a composition comprising, in a content expressed as weight percentages, by total weight of glass:
SiO 2
40-78%;
Al 2 O 3
0-18%;
B 2 O 3
0-18%;
Na 2 O
0-20%;
CaO
0-15%;
MgO
0-10%;
K 2 O
0-10%;
BaO
0-5%;
total iron (expressed as Fe 2 O 3 )
0.04-1.7%;
Chromium (expressed as Cr 2 O 3 )
0.05-0.8%; and
Cobalt (expressed as Co)
0.03-0.175%,
wherein
Cr 2 O 3 <1-5.5Co, and 0.5<Cr 2 O 3 /Fe 2 O 3 ≤1.2, and colorants in the glass sheet consist essentially of iron, Chromium, and Cobalt.
18. The glass sheet according to claim 17 , wherein Cr 2 O 3 /Fe 2 O 3 ≤0.8.
19. The glass sheet according to claim 17 , wherein the glass sheet has a TLD4 lower than 10%.
20. The glass sheet according to claim 17 , wherein the glass sheet has a T 850 higher than 80%.