Electrochemical sensor, particularly for internal combustion eng

Details Electrochemical sensor, particularly for internal combustion eng Electrochemical sensor, particularly for internal combustion eng

1979-07-12

1981-06-30

Kaplan, G. L.

Chemistry: electrical and wave energy

Processes and products

Vacuum arc discharge coating

204192C, 427 50, 427124, 427125, G01N 2758, C23C 1500, B05D 512

Patent

active

042761425

ABSTRACT:
To increase the sensitivity of internal combustion engine exhaust gas sensors, which provide a voltage jump output upon transition of the composition of the exhaust between reducing and oxidizing state, and to maintain the porosity of a platinum, or platinum metal alloy layer forming an electrode on a body of zirconium dioxide, the electrode or electrode layer has dispersed therein an oxide or a carbide of a metal which impedes or inhibits recrystallization at the temperatures to which the sensor is exposed, for example 1000.degree. C., typically zirconium, titanium, tantalum, niobium, aluminum or thorium oxide, or titanium or tantalum carbide, applied, for example, by sequential vaporization of platinum or a platinum metal alloy and the respective metal forming the oxide, in an atmosphere containing residual oxygen, and then oxidizing the remaining metal being applied; or by simultaneous application of a carbide and platinum, for example during simultaneous cathodic atomization, or electron beam vaporization of the respective materials, to form a porous electrode layer of about 2-3 .mu.m thickness, containing approximately 5-40 mol-% of the recrystallization-inhibiting material and having a square resistance not exceeding 20 ohm-square resistance.

REFERENCES:
patent: 3645875 (1972-02-01), Record et al.
patent: 3914169 (1975-10-01), Horowitz
patent: 3941673 (1976-03-01), Takao et al.
patent: 3989614 (1976-11-01), Tien
patent: 4080276 (1978-03-01), Bode
patent: 4138881 (1979-02-01), Isenberg
patent: 4170530 (1979-10-01), Watanabe et al.

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