Method for producing electrochemical element and electrochemical

Details Method for producing electrochemical element and electrochemical Method for producing electrochemical element and electrochemical

1998-11-13

2000-12-05

Tung, T.

Chemistry: electrical and wave energy

Apparatus

Electrolytic

156 896, 204425, 204426, 204427, 264618, 264620, 264656, 264676, G01N 27407

Patent

active

061561754

ABSTRACT:
A method for producing a NOx sensor comprises the steps of forming electrodes on ceramic green sheets, and stacking and integrating the ceramic green sheets into one unit followed by sintering to prepare a substrate, wherein an oxygen concentration is controlled to be not more than 0.5% in a sintering atmosphere after removal of a binder in the step of sintering the substrate. Specifically, the sintering is performed in an atmospheric atmosphere in Interval 1 in which the temperature in a furnace is changed from room temperature to about 1000.degree. C., and the sintering is performed in a nitrogen atmosphere (oxygen concentration in the atmosphere in the furnace is controlled to be about 400 ppm) in Interval 2 in which the temperature is changed from 1000.degree. C. to a maximum temperature followed by spontaneous radiational cooling. Accordingly, it is possible to suppress alloy formation on a detecting electrode for detecting a measurement gas component (for example, NOx), and it is possible to improve the measurement accuracy of the NOx sensor.

REFERENCES:
patent: 4505807 (1985-03-01), Yamada
patent: 5169811 (1992-12-01), Cipollini et al.
patent: 5252519 (1993-10-01), Nakatani et al.
patent: 5419857 (1995-05-01), Van den Sype
patent: 5736095 (1998-04-01), Shimada et al.

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