Barium- and strontium-free vitreous or glass-ceramic jointing material and its use
AssigneeSchott AG
InventorsDieter Goedeke, Jens Suffner
Life of this patent
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Abstract
A vitreous or glass-ceramic jointing material, which has a coefficient of thermal expansion α(20-750) of ≧7·10−6 K−1 and is free of BaO and SrO except for at the most impurities and is suitable for producing joint connections between chromium-containing alloys or chromium-containing steels.
Claims17
A vitreous or glass-ceramic jointing material, which has a coefficient of thermal expansion α(20-750) of ≧7·10−6 K−1 and is free of BaO and SrO except for at most impurities thereof, and comprises, in mol % on an oxide basis:
- SiO2
- 34-60
- B2O3
- 4-14
- Al2O3
- 0-13
- CaO
- 15-45
- MgO
- 0-30
- La2O3
- 0-10
- Y2O3
- 0-10
- TiO2
- 0-10
- ZrO2
- 0-10
- SnO2
- 0-10
- HfO2
- 0-10
- R2O3
- 0-10,
- wherein R2O3 is an oxide selected from the group consisting of Ga2O3, In2O3, Dy2O3 and Yb2O3;
- and
- wherein said jointing material contains no P2O5.
A vitreous or glass-ceramic jointing material, which has a coefficient of thermal expansion α(20-750) of ≧7·10−6 K−1 and is free of BaO and SrO except for at most impurities thereof, and comprises in mol % on an oxide basis:
- SiO2
- 34-50
- B2O3
- 4-14
- Al2O3
- 2-13
- CaO
- 17-45
- MgO
- 0-<10
- La2O3
- 0-10
- Y2O3
- 0-10
- TiO2
- 0-10
- ZrO2
- 0-10
- SnO2
- 0-10
- HfO2
- 0-10
- R2O3
- 0-10,
- wherein R2O3 is an oxide selected from the group consisting of Ga2O3, In2O3, Dy2O3 and Yb2O3;
- and
- wherein said jointing material contains no P2O5.
A vitreous or glass-ceramic jointing material, which has a coefficient of thermal expansion α(20-750) of ≧7·10−6 K−1 and is free of BaO and SrO except for at most impurities thereof, and comprises, in mol % on an oxide basis:
- SiO2
- 30-60
- B2O3
- 0.1-10
- Al2O3
- 0-2
- CaO
- 15-40
- MgO
- 0-30
- La2O3
- 0-10
- Y2O3
- 0-10
- TiO2
- 0-10
- ZrO2
- 0-10
- SnO2
- 0-10
- HfO2
- 0-10
- R2O3
- 0-10,
- wherein R2O3 is an oxide selected from the group consisting of Ga2O3, In2O3, Dy2O3 and Yb2O3;
- and
- wherein said jointing material contains no P2O5.
A vitreous or glass-ceramic jointing material, which has a coefficient of thermal expansion α(20-750) of ≧7·10−6 K−1 and is free of BaO and SrO except for at most impurities thereof, and comprises, in mol % on an oxide basis:
- SiO2
- 34-60
- B2O3
- 0.1-14
- Al2O3
- 0-13
- CaO
- 15-45
- MgO
- 0-30
- La2O3
- 0-10
- Y2O3
- 0-10
- TiO2
- 0-10
- ZrO2
- 0-10
- SnO2
- 0-10
- HfO2
- 0-10
- R2O3
- 0-10,
- wherein R2O3 is an oxide selected from the group consisting of Ga2O3, In2O3, Dy2O3 and Yb2O3;
- and
- wherein said jointing material also contains Y2O3 in an amount >0 mol %.
A vitreous or glass-ceramic jointing material, which has a coefficient of thermal expansion α(20-750) of ≧7·10−6 K−1 and is free of BaO and SrO except for at most impurities thereof, and comprises, in mol % on an oxide basis:
- SiO2
- 34-60
- B2O3
- 0.1-14
- Al2O3
- 0-13
- CaO
- 15-45
- MgO
- 0-30
- La2O3
- 0-10
- Y2O3
- 0-10
- TiO2
- 0-10
- ZrO2
- 0-10
- SnO2
- 0-10
- HfO2
- 0-10
- R2O3
- 0-10,
- wherein R2O3 is an oxide selected from the group consisting of Ga2O3, In2O3, Dy2O3 and Yb2O3;
- wherein said jointing material also contains at least one alkali metal oxide selected from the group consisting of Na2O, K2O and Li2O;
- and
- wherein a sum total amount of said Na2O+said K2O+said Li2O, in mol % on an oxide basis, in the jointing material is <1.
A vitreous or glass-ceramic jointing material, which has a coefficient of thermal expansion α(20-750) of ≧7·10−6 K−1 and is free of BaO and SrO except for at most impurities thereof, and comprises, in mol % on an oxide basis:
- SiO2
- 34-60
- B2O3
- 0.1-14
- Al2O3
- 0-13
- CaO
- 15-45
- MgO
- 0-30
- La2O3
- 0-10
- Y2O3
- 0-10
- TiO2
- 0-10
- ZrO2
- 0-10
- SnO2
- 0-10
- HfO2
- 0-10
- R2O3
- 0-10,
- wherein R2O3 is an oxide selected from the group consisting of Ga2O3, In2O3, Dy2O3 and Yb2O3;
- wherein the jointing material also contains at least one alkali metal oxide selected from the group consisting of Cs2O and Rb2O;
- and
- wherein a sum total amount of said Cs2O+said Rb2O, in mol % on an oxide basis, in the jointing material is <5.
Dependencies are inferred from the claim text.