Fluorophosphate glasses
AssigneeSchott AG
InventorsSimone Ritter, Bianca Schreder, Ute Woelfel, Stefanie Hansen
Life of this patent
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Abstract
Glass having an optimized degree of cross-linking of the phosphate component in the glass matrix is provided so that excellent weatherability is achieved. These glasses are fluorophosphate glasses that contain copper oxide as coloring component. The glasses can further contain coloring components and are obtainable in a method that includes a bubbling step.
Claims11
A fluorophosphate glass comprising a cross-link degree of at least 68% and a composition in % by weight comprising:
- % by weight
- min.
- max.
- P2O5
- 25
- 60
- Al2O3
- 1
- 13
- MgO
- 1
- 10
- CaO
- 1
- 16
- BaO
- 1
- 26
- SrO
- 0
- 16
- ZnO
- 0
- 10
- Li2O
- 0
- 13
- Na2O
- 0
- 10
- K2O
- 4
- 11
- CuO
- 1
- 7
- ΣRO (R = Mg, Ca, Sr, Ba)
- 15
- 40
- ΣR2O (R = Li, Na, K)
- 3
- 18
- wherein up to 39% by molar quantity of the O2− ions are replaced with F.
A filter glass comprising:
- fluorophosphate glass comprising a cross-link degree of at least 68% and a composition in % by weight comprising:
- % by weight
- min.
- max.
- P2O5
- 25
- 60
- Al2O3
- 1
- 13
- MgO
- 1
- 10
- CaO
- 1
- 16
- BaO
- 1
- 26
- SrO
- 0
- 16
- ZnO
- 0
- 10
- Li2O
- 0
- 13
- Na2O
- 0
- 10
- K2O
- 4
- 11
- CuO
- 1
- 7
- ΣRO (R = Mg, Ca, Sr, Ba)
- 15
- 40
- ΣR2O (R = Li, Na, K)
- 3
- 18
- wherein up to 39% by molar quantity of the O2− ions are replaced with F.
A method for the production of a filter glass, the method comprising the steps of:
- preparing a glass melt from glass components;
- and
- bubbling oxygen through the glass melt to provide a fluorophosphate glass comprising a cross-link degree of at least 68% and a composition in % by weight comprising:
- % by weight
- min.
- max.
- P2O5
- 25
- 60
- Al2O3
- 1
- 13
- MgO
- 1
- 10
- CaO
- 1
- 16
- BaO
- 1
- 26
- SrO
- 0
- 16
- ZnO
- 0
- 10
- Li2O
- 0
- 13
- Na2O
- 0
- 10
- K2O
- 4
- 11
- CuO
- 1
- 7
- ΣRO (R = Mg, Ca, Sr, Ba)
- 15
- 40
- ΣR2O (R = Li, Na, K)
- 3
- 18
- wherein up to 39% by molar quantity of the O2− ions are replaced with F.
A fluorophosphate glass comprising a composition in % by weight of:
- % by weight
- min.
- max.
- P2O5
- 25
- 60
- Al2O3
- 1
- 13
- MgO
- 1
- 10
- CaO
- 1
- 16
- BaO
- 1
- 26
- SrO
- 0
- 16
- ZnO
- 0
- 10
- Na2O
- 2
- 10
- K2O
- 0.01
- 11
- CuO
- 1
- 7
- ΣRO (R = Mg, Ca, Sr, Ba)
- 15
- 40
- ΣR2O (R = Na, K)
- 3
- 18
- wherein the composition is free of lithium oxide and up to 39% by molar quantity of the O2− ions are replaced with F.
Dependencies are inferred from the claim text.