Oxygen sensor with heater

Details Oxygen sensor with heater Oxygen sensor with heater

1984-04-27

1985-04-23

Kaplan, G. L.

Chemistry: electrical and wave energy

Apparatus

Electrolytic

204427, 204428, G01N 2758

Patent

active

045128715

ABSTRACT:
An oxygen sensor having a bar-shaped heater inserted in an elongate bore formed in a tubular solid electrolyte body which has porous platinum electrodes on its inner and outer surfaces and which is supported by a housing such that its closed end portion is exposed to exhaust gas and such that the elongate bore is gas-tight with respect to the exhaust gas. The bar-shaped heater comprises a heating resistor having a positive temperature coefficient, a ceramic body carrying the heating resistor so as to embed the latter, and a pair of lead wires. The ceramic body has on its periphery a pair of terminal pads connected to the heating resistor. The ends of the lead wires are brazed to the pads with a mass of brazing material containing silver. An exposed surface of the brazing mass is coated with a metal layer made of metal which is different from silver or its alloy. The metal layer may be further coated with a heat-resistant layer.

REFERENCES:
patent: 4175019 (1979-11-01), Murphy
patent: 4212720 (1980-07-01), Maurer et al.
patent: 4437971 (1984-03-01), Csanitz et al.

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