Crystallizing glass solders and uses thereof
AssigneeSchott AG
InventorsDIETER GOEDEKE, PETER BRIX, OLAF CLAUSSEN, JOERN BESINGER, BASTIAN SCHOEN
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Abstract
A crystallizing glass solder for high-temperature applications, which is free of PbO and contains, in % by weight on an oxide basis: 45% to 60% of BaO; 25% to 40% of SiO2; 5% to 15% of B2O3; 0 to <2% of Al2O3; 2 to 7.0, preferably 4.4 to 7.0%, of MgO; and at least one alkaline earth metal oxide from the group consisting of MgO, CaO and SrO, wherein CaO is 0% to 5% and the sum of the alkaline earth metal oxides MgO, CaO and SrO is 2% to 15%. Preferred embodiments of the glass solder contain from 3 to 15 wt. % of Y2O3 and have low porosity and high stability with respect to a moist fuel gas environment.
Claims20
A crystallizing glass solder for high-temperature applications, wherein said crystallizing glass solder is free of PbO and contains, in percent by weight on an oxide basis, 25 to 40%, SiO2;
- <2, Al2O3;
- 5 to 15%, B2O3;
- 45 to 60%, BaO;
- 0 to 5%, CaO;
- 2 to 7.0%, MgO;
- and 2 to 15% of a sum total of MgO, CaO and SrO.
A crystallizing glass solder for high-temperature applications, wherein said crystallizing glass solder is free of PbO and consists essentially of, in percent by weight on an oxide basis, 25 to 40%, SiO2;
- <2, Al2O3;
- 5 to 15%, B2O3;
- 45 to 60%, BaO;
- 0 to 5%, CaO;
- 2 to 7.0%, MgO;
- and 2 to 15% of a sum total of MgO, CaO and SrO.
A crystallizing glass solder for high-temperature applications, wherein said crystallizing glass solder is free of PbO and consists of, in percent by weight on an oxide basis, 25 to 40%, SiO2;
- <2, Al2O3;
- 5 to 15%, B2O3;
- 45 to 60%, BaO;
- 0 to 5%, CaO;
- 2 to 7.0%, MgO;
- and 2 to 15% of a sum total of MgO, CaO and SrO.
A composite comprising a crystallizing glass solder and a crystalline filler;
- wherein said crystalline filler is present in an amount up to 35% by weight;
- wherein said crystallizing glass solder is free of PbO and contains, in percent by weight on an oxide basis, 45 to 60% of BaO, 25 to 40% of SiO2, 5 to 15% of B2O3, 0 to <2% of Al2O3, 2 to 7.0% of MgO, and at least one alkaline earth oxide selected from the group consisting of MgO, CaO and SrO;
- and
- wherein CaO is present in the crystallizing glass solder in an amount of 0 to 5% by weight on said oxide basis and a sum total amount of the alkaline earth oxides MgO, CaO and SrO in the crystallizing glass solder is 2 to 15% by weight on said oxide basis.
A high-temperature joint, particularly for a fuel cell, said joint comprising a crystallizing glass solder;
- wherein said crystallizing glass solder is free of PbO and contains, in percent by weight on an oxide basis, 45 to 60% of BaO, 25 to 40% of SiO2, 5 to 15% of B2O3, 0 to <2% of Al2O3, 2 to 7.0% of MgO, and at least one alkaline earth oxide selected from the group consisting of MgO, CaO and SrO;
- and
- wherein CaO is present in an amount of 0 to 5% by weight on said oxide basis, and a sum total amount of the alkaline earth oxides MgO, CaO and SrO is 2 to 15% by weight on said oxide basis.
Dependencies are inferred from the claim text.