Oxygen sensor for air-fuel ratio control having a protective lay

Details Oxygen sensor for air-fuel ratio control having a protective lay Oxygen sensor for air-fuel ratio control having a protective lay

1990-02-14

1992-11-03

Niebling, John

Chemistry: electrical and wave energy

Apparatus

Electrolytic

338 34, G01N 2758

Patent

active

051605988

ABSTRACT:
Oxygen sensor for air-fuel ratio control is provided with a sensor element having an oxygen ion-conductive main body and electrodes on both sides thereof, and at least one porous protective layer covering the electrode on the exhaust gas side. The protective layer includes an oxygen storage component OSC without copresence of a noble metal catalyst. The protective layer is intermeshingly connected to the main body via spherical protrusions of the main body. Double-layered protective layer structure includes OSC noncontaining layer (optionally containing catalyst) and OSC containing layer, as inner and outer protective layer or vice versa. OSC containing layer is formed by impregnation with OSC-solution through immersing the respective porous protective layer, or by cosintering the OSC containing green coating layer. By impregnation 0.2 -8 wt %, or by cosintering 0.2-30 wt %, of OSC metal element is containable. The outer protective layer is thinner and more porous than the inner protective layer. Any of the protective layers can be formed by flame spraying.

REFERENCES:
patent: 4199425 (1980-04-01), Sinkevitch
patent: 4477487 (1984-10-01), Kojima et al.
patent: 4584086 (1986-04-01), Hayakawa et al.
patent: 4834051 (1989-05-01), Tanaka et al.
patent: 4840913 (1989-06-01), Logothetis et al.
patent: 4851105 (1989-07-01), Ishiguro et al.

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