Electrically conducting ceramic to metal seal, particularly for

Details Electrically conducting ceramic to metal seal, particularly for Electrically conducting ceramic to metal seal, particularly for

1973-08-29

1976-01-06

Farley, Richard A.

Compositions

Electrically conductive or emissive compositions

Elemental carbon containing

252504, 252506, 252507, 403 29, 427214, H01B 104

Patent

active

039310558

ABSTRACT:
Glass powder is wetted with an aqueous solution or emulsion of an organic binder and mixed with carbon black in the form of soot or lampblack. The resulting material is packed between the parts of the central electrode of a sparkplug and fired at a temperature sufficient to fuse the glass to produce a gas-tight seal with electrically conducting properties. Up to 5% of metal powders may be included in the material if it is desired to prevent the resistance from rising during service. Oxides or carbides and certain other metal powders may be added to bring the thermal expansion coefficient to a desired average value.

REFERENCES:
patent: 3226342 (1965-12-01), Kesten
patent: 3538021 (1970-11-01), Achey
patent: 3567658 (1971-03-01), Webb et al.

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