Method of producing thick-film gas sensor element having improve

Details Method of producing thick-film gas sensor element having improve Method of producing thick-film gas sensor element having improve

1990-08-13

1993-04-13

Beck, Shrive

Coating processes

Electrical product produced

Metal coating

4271263, 4273762, C23C 2600

Patent

active

052021548

ABSTRACT:
The invention relates to a method of producing a gas sensor element having a porous film formed by a thick-film technique on a ceramic substrate surface so as to cover selected portions of electrode films precedingly formed on the substrate surface. The electrode material is a noble metal such as platinum. Both the electrode films and the gas sensitive porous thick-film are formed by known methods. To improve the contact between the gas sensitive porous thick-film and the electrode films both mechanically and electrically and stabilize the internal resistance of the sensor element by depositing a noble metal such as platinum at the interface between the porous thick-film and each electrode film, the porous thick-film is impregnated with a solution of a noble metal compound such as chloroplatinic acid and thereafter maintained in a reducing gas atmosphere having a controlled humidity in the range from 5 to 90% (relative humidity) at a temperature in the range from 10.degree. C. to 135.degree. C.

REFERENCES:
patent: 4234367 (1980-11-01), Herron
patent: 4551357 (1985-11-01), Takeuchi
patent: 4627160 (1986-12-01), Herron
patent: 4720394 (1988-01-01), Kojima
patent: 4857275 (1989-08-01), Furnsaki
patent: 4965092 (1990-10-01), Hayduk
English translation of Japanese Patent 60-93949.
English translation of Japanese Patent 63-231255.
English translation of Japanese Patent 62-5165.

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