Gas sensor and method of manufacture

Adhesive bonding and miscellaneous chemical manufacture – Methods – Surface bonding and/or assembly therefor

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23254E, 73 19, 73 27R, 106 395, 106 733, 264 60, 338 34, C04B 3912

Patent

active

039322467

ABSTRACT:
A gas sensor, and its method of manufacture, particularly useful as an exhaust gas sensor for an internal combustion engine air/fuel ratio system, is disclosed. The sensor is comprised of a sintered ceramic body of transition metal oxide, such as titania, and includes a pair of spacedapart electrodes. As the partial pressure of oxygen in the gas being sensed varies in response to variations in the inlet air/fuel mixture ratio, the resistance of the ceramic material varies. The active portion of the sensor body is a substantially uniform body of porous ceramic material having a density of less than about 85% of theoretical density and a modulus of rupture in excess of 11,000 psi. The sensor is fabricated from a very pure transition metal oxide powder having a very fine and highly uniform particle size. The transitional metal oxide is selected so that the operating temperature of the resulting device is less than about 75% and preferably less than about 50% of the melting temperature of the metal oxide.

REFERENCES:
patent: 2725186 (1973-04-01), Lynch
patent: 3274467 (1966-09-01), Graf
patent: 3423517 (1969-01-01), Arrhenius
patent: 3611243 (1971-10-01), Hardtl
patent: 3639132 (1972-02-01), Egerton et al.
patent: 3676820 (1972-07-01), Taguchi
patent: 3717487 (1973-02-01), Hurley et al.
patent: 3732519 (1973-05-01), Taguchi

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