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A solid oxide fuel cell generator is provided for electrochemically reacting a fuel gas with a flowing oxidant gas at an elevated temperature to produce power. The generator includes a generator section receiving a fuel gas and a plurality of elongated fuel cells extending through the generator sect

A solid oxide fuel cell generator is provided for electrochemically reacting a fuel gas with a flowing oxidant gas at an elevated temperature to produce power. The generator includes a generator section receiving a fuel gas and a plurality of elongated fuel cells extending through the generator section and having opposing open fuel cell ends for directing an oxidant gas between opposing plena in the generator. A sealant defines a seal on the fuel cells adjacent at least one of the fuel cell ends. The sealant is a modified lanthanum borate aluminosilicate glass composition having a minimal amount of boron oxide and silica, and in which the sealant maintains substantially constant physical characteristics throughout multiple thermal cycles.

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1. A solid oxide fuel cell generator for electrochemically reacting a fuel gas with a flowing oxidant gas at an elevated temperature to produce power, said generator comprising a generator section receiving a fuel gas;a plurality of elongated fuel cells extending through said generator section and h

1. A solid oxide fuel cell generator for electrochemically reacting a fuel gas with a flowing oxidant gas at an elevated temperature to produce power, said generator comprising a generator section receiving a fuel gas;a plurality of elongated fuel cells extending through said generator section and having opposing open fuel cell ends for directing an oxidant gas between opposing plena in said generator;a sealant defining a seal on said fuel cells adjacent at least one of said fuel cell ends, said sealant comprising a lanthanum borate aluminosilicate glass composition;wherein said fuel cells comprise a fuel electrode of nickel/yttria or scandia stabilized zirconia, an oxidant electrode of lanthanum manganite and an electrolyte of yttria or scandia stabilized zirconia, and said glass composition further comprises:La2O3 present in an amount up to about 20 mole %;Al2O3 present in an amount of between about 10 to about 20 mole %;SrO present in an amount of between about 30 to about 40 mole %;ZrO2 present in an amount up to about 5 mole %;at least one of YO1.5 and ScO1.5 present in an amount up to about 0.5 mole %; andMgO present in an amount of between about 10 to about 30 mole %; andwherein said glass composition includes B2O3 and SiO2 having a combined mole percent of less than 32%. 2. The generator of claim 1, wherein the glass composition constituents are present as 4.3 mole % La2O3, 22.2 mole % B2O3, 9.2 mole % SiO2, 12.9 mole % Al2O3, 34.5 mole % SrO, 3.7 mole % ZrO2 and YO1.5 or ScO1.5; and 13.2 mole % MgO. 3. A solid oxide fuel cell generator for electrochemically reacting a fuel gas with a flowing oxidant gas at an elevated temperature to produce power, said generator comprising: a generator section receiving a fuel gas;a plurality of elongated fuel cells extending through said generator section and having opposing open fuel cell ends for directing an oxidant gas between opposing plena in said generator;a sealant defining a seal on said fuel cells adjacent at least one of said fuel cell ends, said sealant comprising a lanthanum borate aluminosilicate glass composition; andwherein said lanthanum borate aluminosilicate glass composition includes La2O3 present in an amount up to about 20 mole %, ZrO2 present in an amount up to about 5 mole %, and at least one of YO1.5 and ScO1.5 present in an amount up to about 0.5 mole %; and wherein said glass composition further comprises: B2O3 and SiO2 having a combined mole percent of less than about 32%; Al2O3 present in an amount of between about 10 to about 20 mole %; SrO present in an amount of between about 30 to about 40 mole %; and MgO present in an amount of between about 10 to about 30 mole %. 4. The generator of claim 3, wherein said fuel cells comprise a fuel electrode of nickel/yttria or scandia stabilized zirconia, an oxidant electrode of lanthanum manganite and an electrolyte of yttria or scandia stabilized zirconia. 5. The generator of claim 3, wherein the glass composition constituents are present as 4.3 mole % La2O3, 22.2 mole % B2O3, 9.2 mole % SiO2, 12.9 mole % Al2O3, 34.5 mole % SrO, 3.7 mole % ZrO2 and YO1.5 or ScO1.5, and 13.2 mole % MgO.