Radiopaque glass and uses thereof
AssigneeSchott AG
InventorsUlf Dahlmann, Sabine Pichler-Wilhelm, Jens Suffner
Life of this patent
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Abstract
The amorphous, or at least partially crystalline, glass-based joining material is suitable for high-temperature applications, particularly in fuel cells and/or sensors. In addition to SiO2 and B2O3 as glass formers, the joining material similarly contains BaO and CaO, whereby the amount of Al2O3 is limited. The joining material has a coefficient of linear thermal expansion of at least 7.0·10−6 K−1 in a range of 20° C. to 300° C. The joining material can be used for joining ferritic high-grade steels and/or chromium-containing alloys and/or ceramics, such as stabilized zirconium oxide and/or aluminium oxide.
Claims26
A radiopaque glass having a refractive index nd of 1.48 to 1.56, which is free of PbO apart from at most impurities, said radiopaque glass having a composition comprising, in wt. % on an oxide basis:
- SiO2
- 35-75
- B2O3
- 5-15
- Al2O3
- 0.8-7.5
- K2O
- 0-10
- BaO
- 0.6-24
- Cs2O
- 1-30
- SnO2
- >4-15
- F
- ≥0.5
- BaO + Cs2O + SnO2 + F
- ≥10.
A glass for diagnostic purposes in humans or animals, said radioactive glass having a refractive index nd of 1.48 to 1.56, which is free of PbO apart from at most impurities, said radioactive glass having a composition comprising, in wt. % on an oxide basis
- SiO2
- 35-75
- B2O3
- 5-15
- Al2O3
- 0.8-7.5
- K2O
- 0-10
- BaO
- 0.6-24
- Cs2O
- 1-30
- SnO2
- >4-15
- F
- ≥0.5
- BaO + Cs2O + SnO2 + F
- ≥10.
A dental glass for treating cavities in teeth, or for a dental restoration, in humans or animals, said dental glass comprising a radiopaque glass having a refractive index nd of 1.48 to 1.56, which is free of PbO apart from at most impurities, said radiopaque glass having a composition comprising, in wt. % on an oxide basis
- SiO2
- 35-75
- B2O3
- 5-15
- Al2O3
- 0.8-7.5
- K2O
- 0-10
- BaO
- 0.6-24
- Cs2O
- 1-30
- SnO2
- >4-15
- F
- ≥0.5
- BaO + Cs2O + SnO2 + F
- ≥10.
Dependencies are inferred from the claim text.