Titanium sealing glasses and seals formed therefrom
AssigneeSandia Corporation
InventorsRichard K. Brow, Howard L. McCollister, Carol C. Phifer, Delbert E. Day
Life of this patent
Estimating the term…
Abstract
Alkaline-earth lanthanoborate sealing-glass compositions containing CaO, La.sub.2 O.sub.3, B.sub.2 O.sub.3, TiO.sub.2 and Al.sub.2 O.sub.3 in various combinations of mole-% are provided. These sealing-glass compositions are useful for forming hermetic glass-to-metal seals with titanium and titanium alloys that have a high aqueous durability for component or device applications requiring exposure to moisture, water or body fluids. Particular applications of the titanium sealing-glass compositions include forming glass-to-metal seals for lithium batteries and implanted biomedical devices (e.g. batteries, pacemakers, defibrillators, pumps).
Claims17
A glass-to-metal seal having an improved aqueous durability, comprising:
- a metal consisting of titanium or a titanium alloy;
- and
- a sealing-glass in contact with the metal and comprising:
- 10-43 mole-% CaO,
- 8-30 mole-% La.sub.2 O.sub.3, and
- 31-57 mole-% B.sub.2 O.sub.3.
An electrical feedthrough for use in an implantable device, comprising:
- a sealing-glass composition including
- 10-43 mole-% CaO,
- 8-30 mole-% La.sub.2 O.sub.3, and
- 31-57 mole-% B.sub.2 O.sub.3,
- in contact with titanium or a titanium alloy.
A glass-to-metal seal for use in a lithium battery, comprising:
- an outer glass-to-metal seal comprising a first sealing-glass composition in contact with titanium or a titanium alloy for providing a substantial chemical resistance to water;
- and
- an inner glass to metal seal superposed with the outer glass-to-metal seal comprising a sealing-glass composition having a substantial chemical resistance to lithium;
- wherein the first-sealing glass composition includes:
- CaO in the amount of 10-43 mole-%;
- La.sub.2 O.sub.3 in the amount of 8-30 mole-%;
- B.sub.2 O.sub.3 in the amount of 31-57 mole-%;
- TiO.sub.2 in the amount of 0-41 mole-%;
- and
- Al.sub.2 O.sub.3 in the amount of 0-28 mole-%.
Dependencies are inferred from the claim text.