Glass-ceramic joining material and use thereof
AssigneeSchott AG
InventorDieter Goedeke
Life of this patent
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Abstract
The glass-ceramic joining material, which is suitable for bonding or joining at low processing temperatures, especially less than 800° C., is composed of a BaO—SiO2—CaO—B2O3—Al2O3 system and has a coefficient of thermal expansion α(20-300)≧9.5·10−6 K−1.
Claims8
An article comprising a bond between at least two metal components;
- wherein said bond comprises a glass-ceramic joining material and said metal components are joined by said joining material;
- wherein said glass-ceramic joining material has a coefficient of thermal expansion α(20-300)≧9.5·10−6 K−1;
- and
- wherein said glass-ceramic joining material, apart from at most impurities, is free of ZnO and free of PbO, and comprises, in mol % based on oxide content:
- SiO2
- 3-<10
- B2O3
- 16-34
- Al2O3
- 7-15
- CaO
- 8-40
- BaO
- 25-38
- MgO
- 0-10
- ZrO2
- 0-5
- Y2O3
- 0-10.
An article comprising a bond between at least two metal components;
- wherein said bond comprises a glass-ceramic joining material and said metal components are joined by said joining material;
- and
- wherein said metal components are composed of ferritic stainless steel;
- wherein said glass-ceramic joining material has a coefficient of thermal expansion α(20-300)≧9.5·10−6 K−1;
- and
- wherein said glass-ceramic joining material, apart from at most impurities, is free of ZnO and free of PbO, and comprises, in mol% based on oxide content:
- SiO2
- 3-<10
- B2O3
- 16-34
- Al2O3
- 7-15
- CaO
- 8-40
- BaO
- 25-38
- MgO
- 0-10
- ZrO2
- 0-5
- Y2O3
- 0-10.
An article comprising a bond between at least two ceramic components;
- wherein said bond comprises a glass-ceramic joining material and said ceramic components are joined by said joining material;
- wherein said glass-ceramic joining material has a coefficient of thermal expansion α(20-300)≧9.5·10−6 K−1;
- and
- wherein said glass-ceramic joining material, apart from at most impurities, is free of ZnO and free of PbO, and comprises, in mol% based on oxide content:
- SiO2
- 3-<10
- B2O3
- 16-34
- Al2O3
- 7-15
- CaO
- 8-40
- BaO
- 25-38
- MgO
- 0-10
- ZrO2
- 0-5
- Y2O3
- 0-10.
An article comprising a bond between at least two ceramic components;
- wherein said bond comprises a glass-ceramic joining material and said ceramic components are joined by said joining material;
- and
- wherein said ceramic components are composed of yttrium and/or scandium-stabilized zirconium oxide;
- wherein said glass-ceramic joining material has a coefficient of thermal expansion α(20-300)≧9.5·10−6 K−1;
- and
- wherein said glass-ceramic joining material, apart from at most impurities, is free of ZnO and free of PbO, and comprises, in mol% based on oxide content:
- SiO2
- 3-<10
- B2O3
- 16-34
- Al2O3
- 7-15
- CaO
- 8-40
- BaO
- 25-38
- MgO
- 0-10
- ZrO2
- 0-5
- Y2O3
- 0-10.
An article comprising a bond between at least one metal component and at least one ceramic component;
- wherein said bond comprises a glass-ceramic joining material and said at least one metal component and said at least one ceramic component are joined by said bondi
- wherein said glass-ceramic joining material has a coefficient of thermal expansion α(20-300)≧9.5·10−6 K−1;
- and
- wherein said glass-ceramic joining material, apart from at most impurities, is free of ZnO and free of PbO, and comprises, in mol% based on oxide content:
- SiO2
- 3-<10
- B2O3
- 16-34
- Al2O3
- 7-15
- CaO
- 8-40
- BaO
- 25-38
- MgO
- 0-10
- ZrO2
- 0-5
- Y2O3
- 0-10.
An article comprising a bond between at least one metal component and at least one ceramic component;
- wherein said bond comprises a glass-ceramic joining material and said at least one metal component and said at least one ceramic component are joined by said bond;
- and
- wherein said at least one metal component is composed of ferritic stainless steel and said at least one ceramic component is composed of yttrium and/or scandium-stabilized zirconium oxide;
- wherein said glass-ceramic joining material has a coefficient of thermal expansion α(20-300)≧9.5·10−6 K−1;
- and
- wherein said glass-ceramic joining material, apart from at most impurities, is free of ZnO and free of PbO, and comprises, in mol% based on oxide content:
- SiO2
- 3-<10
- B2O3
- 16-34
- Al2O3
- 7-15
- CaO
- 8-40
- BaO
- 25-38
- MgO
- 0-10
- ZrO2
- 0-5
- Y2O3
- 0-10.
A fuel cell comprising a glass-ceramic joining material having a coefficient of thermal expansion α(20-300)≧9.5·10−6 K−1, said glass-ceramic joining material comprising, in mol% based on oxide content:
- SiO2
- 3-<10
- B2O3
- 16-34
- Al2O3
- 7-15
- CaO
- 8-40
- BaO
- 25-38
- MgO
- 0-10
- ZrO2
- 0-5
- Y2O3
- 0-10.
A method of producing a bond in a fuel cell, an electrolysis cell, a sensor or an actuator, said method comprising making said bond with a glass-ceramic joining material;
- wherein said glass-ceramic joining material has a coefficient of thermal expansion α(20-300)≧9.5·10−6 K−1;
- and
- wherein said glass-ceramic joining material, apart from at most impurities, is free of ZnO and free of PbO, and comprises, in mol% based on oxide content:
- SiO2
- 3-<10
- B2O3
- 16-34
- Al2O3
- 7-15
- CaO
- 8-40
- BaO
- 25-38
- MgO
- 0-10
- ZrO2
- 0-5
- Y2O3
- 0-10.
Dependencies are inferred from the claim text.