G - Physics – 01 – R
Patent
G - Physics
01
R
324/23
G01R 3/00 (2006.01) H01M 8/12 (2006.01)
Patent
CA 1128128
ABSTRACT OF THE DISCLOSURE. 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° C, typically zirconium,titanium, tantalum, niobium, aluminum or thorium oxide, or titanium or tantalum carbide, applied, for example, by sequential vaporization of platinum ox 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 µ m thickness, containing approximately 5-40 mol-% of the recrystallization-inhibiting material and having a square resistance not exceeding 20 ohm square resistance. -17-
331929
Friese Karl-Hermann
Haecker Wolf-Dieter
Topp Bernhard
Bosch Robert G.m.b.h.
Macrae & Co.
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