Exhaust gas sensor and process for producing same

Details Exhaust gas sensor and process for producing same Exhaust gas sensor and process for producing same

1989-07-06

1991-04-09

Reynolds, Bruce A.

Electrical resistors

Resistance value responsive to a condition

Gas, vapor, or moisture absorbing or collecting

H01C 700

Patent

active

050068288

ABSTRACT:
A BaSnO.sub.3 exhaust gas sensor and a process for producing the same. Surface reformation of sensor electrodes is done for preventing the deterioration of the sensor response and the corrosion of the electrodes by the Sn in the BaSnO.sub.3. After depositing an oxide film such as La.sub.2 Ti.sub.2 O.sub.7 or MgO on the surface of the electrodes, the electrodes are embedded in BaSnO.sub.3, and the BaSnO.sub.3 is sintered. Through the sintering process, the film of La.sub.2 Ti.sub.2 O.sub.7 or MgO is converted to a conductive complex oxide film by reacting with BaSnO.sub.3. The resultant film contains Ba and Sn elements. CaSnO.sub.3 and SrSnO.sub.3, which are homologous compounds of BaSnO.sub.3, are usable in place of BaSnO.sub.3.

REFERENCES:
patent: 4658632 (1987-04-01), Sasaki
patent: 4701739 (1987-10-01), Sasaki et al.
patent: 4816800 (1989-03-01), Onaga et al.

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