Hermetic glass-to-metal seal and method for making same
US4377404A · kind A · utility
Assignees
Inventors
Key dates
| Filing date | Jul 10, 1981 |
| Grant date | Mar 22, 1983 |
| Priority date | — |
| Expiry date | Jul 10, 2001 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC03C27/044
- WIPO fieldMaterials, metallurgy
- WIPO sectorChemistry
Abstract
This invention relates to a manufacturing method and a hermetic glass-to-metal seal suitable for a component in an electric circuit such as a liquid tantalum electrolytic capacitor. The method comprises the steps of fusing a raw material glass in order to form a glass tube; setting a bead, obtained by cutting the glass tube across the axis, in the opening to be sealed, for example, the opening of a member which forms a circuit component; and heating the assembly of the members which composes the circuit component including the bead, above the melting temperature of the bead, with a longitudinal conductor piercing through the bead. This simplified method of manufacturing a hermetic glass-to-metal seal accomplishes a perfect sealing since the sealing glass includes no undesirable impurities such as binder, and since the thermal expansion coefficient of the sealing glass is close to that of the metals used to construct the circuit components, and the sealing glass is stable to electrolyte.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.