Method of processing oxygen concentration sensor by applying AC

Details Method of processing oxygen concentration sensor by applying AC Method of processing oxygen concentration sensor by applying AC

1990-11-08

1992-07-14

Niebling, John

Chemistry: electrical and wave energy

Processes and products

Processes of treating materials by wave energy

204424, 204425, 204406, 204427, 2041531, 204426, G25F 700, G01N 2726

Patent

active

051300028

ABSTRACT:
A method of processing a sensing element of an oxygen sensor including an oxygen-ion conductive solid electrolyte, an electrochemical oxygen pumping cell having a first and a second electrode disposed on the solid electrolyte, an electrochemical oxygen sensing cell having a third and a fourth electrode disposed on the solid electrolyte, and diffusion-resistance means for introducing an external measurement gas for contact with the second and third electrodes. An alternating current having a frequency of not higher than 10 Hz is applied to at least one of the oxygen pumping and sensing cells, with the sensing element held at 600.degree. C. or higher, to form minute cracks on the surface of each metal grain of the first and second electrodes and/or third and fourth electrodes. The alternating current is 1-5 times as a large as a polarographic limit current value of the corresponding pumping and sensing cells.

REFERENCES:
patent: 4419190 (1983-12-01), Dietz et al.
patent: 4505804 (1985-03-01), Mase et al.
patent: 4863583 (1989-09-01), Kurachi et al.
patent: 4882033 (1989-11-01), Shibata et al.
patent: 4950380 (1990-08-01), Kurosawa et al.

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