Hermetic glass-to-metal seal and method for making same

Details Hermetic glass-to-metal seal and method for making same Hermetic glass-to-metal seal and method for making same

1981-07-10

1983-03-22

Lindsay, Jr., Robert L.

Glass manufacturing

Processes

Fusion bonding of glass to a formed part

65 5924, 65 5925, 65 5931, 65 5935, 174137B, 501 66, C03C 2900

Patent

active

043774040

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.

REFERENCES:
patent: 732812 (1903-07-01), Anderson
patent: 2697309 (1954-12-01), Gates
patent: 3545950 (1970-12-01), Earl
patent: 3669698 (1972-06-01), Graff et al.

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