Oxygen sensor and a manufacturing method of the sensor device

Details Oxygen sensor and a manufacturing method of the sensor device Oxygen sensor and a manufacturing method of the sensor device

2007-08-14

2007-08-14

Cygan, Michael (Department: 2855)

Measuring and testing

Gas analysis

Detector detail

C204S429000

Reexamination Certificate

active

10609553

ABSTRACT:
The oxygen sensor of the present invention has excellent durability capable of effectively preventing contamination with lead or the like for a detection electrode even in low temperature exhaust gases, and having stable response over a long period of time. The contamination preventive layer provided in the sensor device comprises composite powders having coarse powders covered therearound with fine powders, and hollows not filled with fine powders are scattered in gaps among the composite powders. Both the coarse and fine powders comprise ceramic powders. Further, it is particularly preferred that the ceramic powders are powders of a titania powder having a peak at 1 μm or less and a composite ceramic powder containing alumina such as spinel having a peak at 10 μm or more. The contamination preventive layer can be formed by coating a slurry containing ceramic powders of different specific surface areas, an organic binder and a solvent such as methanol on the surface of the electrode protection layer followed by drying.

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