Copper aluminoborosilicate glass and uses thereof

Patent metadata

Field	Value
Publication number	US-12304859-B2
Application number	US-201917414183-A
Country	US
Kind code	B2
Filing date	Dec 17, 2019
Priority date	Dec 20, 2018
Publication date	May 20, 2025
Grant date	May 20, 2025

Abstract

The present invention provides an aluminoborosilicate glass of composition, expressed as percentages by weight of oxides, containing: 60% to 70% of SiO 2 , 13% to 20% of Al 2 O 3 , 1% to 9% of B 2 O 3 , 0 to 3% of P 2 O 5 , 0.5% to 4% of MgO, 1% to 4% of BaO, 0 to 3% of CaO, 0 to 3% of SrO, 2% to 10% of ZnO, 0 to 2% of Li 2 O, 0 to 2% of Na 2 O, 0 to 2% of K 2 O, 0.1% to 3% of CuO, optionally up to 1% of at least one fining agent; and optionally up to 2% of at least one coloring agent other than CuO, with MgO+BaO+CaO+SrO<6%, 0.2%<Li 2 O+Na 2 O+K 2 O<2%, and B 2 O 3 +MgO+Li 2 O—(BaO+CaO+SrO+CuO)<6.4%. The invention also provides an article constituted at least in part of an aluminoborosilicate glass, the article being selected from glazing and a cooktop for associating with induction heater means with infrared sensors.

First claim

The invention claimed is:

1. An aluminoborosilicate glass of composition, expressed as percentages by weight of oxides, containing:
60% to 70% of SiO 2 ,
13% to 20% of Al 2 O 3 ,
1% to 9% of B 2 O 3 ,
0 to 3% of P 2 O 5 ,
0.5% to 4% of MgO,
1% to 4% of BaO,
0 to 3% of CaO,
0 to 3% of SrO,
2% to 10% of ZnO,
0 to 2% of Li 2 O,
0 to 2% of Na 2 O,
0 to 2% of K 2 O,
0.1% to 3% of CuO,
0 to 1% of at least one fining agent;

and
0 to 2% of at least one coloring agent other than CuO,

with:
MgO+BaO+CaO+SrO≤6%,

0.2%≤Li 2 O+Na 2 O+K 2 O≤2%, and

B 2 O 3 +MgO+Li 2 O—(BaO+CaO+SrO+CuO)<6.4%.

2. An aluminoborosilicate glass according to claim 1 , wherein the composition contains 0 to 1% of Li 2 O.

3. An aluminoborosilicate glass according to claim 1 , wherein the composition does not contain SrO, with the exception of inevitable traces.

4. An aluminoborosilicate glass according to claim 1 , wherein the composition contains 0.5% to 1.8% of CuO.

5. An aluminoborosilicate glass according to claim 1 , wherein the composition contains at least one coloring agent other than CuO.

6. An aluminoborosilicate glass according to claim 5 , wherein said at least one coloring agent is selected from Fe 2 O 3 , CoO, NiO, Cr 2 O 3 , MnO 2 , and V 2 O 5 , and mixtures thereof.

7. An aluminoborosilicate glass according to claim 1 , wherein it presents:
viscosity of 30 Pa·s (300 poises) at less than 1680° C.;
viscosity at the liquidus temperature of more than 500 Pa·s (5000 poises);
electrical resistivity at 30 Pa·s of less than 100 Ω·cm;
coefficient of thermal expansion (CTE) from 20° C. to 300° C. less than 30×10 −7 /° C.; and
resistance to acid attack (half weight loss per unit area), measured using the DIN 12-116 standard of less than 250 mg/dm 2 .

8. An article constituted at least in part of an aluminoborosilicate glass according to claim 1 , the article being selected in particular from glazing and from a cooktop for associating with induction heater means with infrared sensors.

9. An aluminoborosilicate glass according to claim 1 , wherein the composition contains B 2 O 3 +MgO+Li 2 O—(BaO+CaO+SrO+CuO)<6%.

10. An aluminoborosilicate glass according to claim 1 , wherein the composition contains 0.1% to 1% of Li 2 O.

11. An aluminoborosilicate glass according to claim 1 , wherein the composition contains 0.2% to 0.6% of Li 2 O.

12. An aluminoborosilicate glass according to claim 1 , wherein the composition contains 0.001% to 2% of at least one coloring agent other than CuO.

13. An aluminoborosilicate glass according to claim 1 , wherein the composition contains 0.05% to 2% of at least one coloring agent other than CuO.

14. An aluminoborosilicate glass according to claim 5 , wherein the at least one coloring agent is selected from a mixture of NiO, CoO, and Fe 2 O 3 .

15. An aluminoborosilicate glass according to claim 1 , wherein it presents a viscosity of 30 Pa·s (300 poises) at less than 1660° C.

16. An aluminoborosilicate glass according to claim 1 , wherein it presents a viscosity at the liquidus temperature of more than 600 Pa·s (6000 poises).

Assignees

• Eurokera
• Corning Inc

Inventors

• Lehuede Philippe
• Comte Marie

Classifications

• H05B6/12

  Cooking devices · CPC title

• C03C3/097 Primary

  containing phosphorus, niobium or tantalum · CPC title

• C03C3/093 Primary

  containing zinc or zirconium · CPC title