Chemistry: electrical and wave energy – Processes and products – Vacuum arc discharge coating
Patent
1979-03-28
1980-09-02
Kaplan, G. L.
Chemistry: electrical and wave energy
Processes and products
Vacuum arc discharge coating
G01N 2758
Patent
active
042205174
ABSTRACT:
In an oxygen concentration sensing apparatus comprising a solid, oxygen ion conductive, electrolyte and intervening between two electrodes to generate across the two electrodes a potential difference due to a difference in oxygen concentrations at the boundaries between the two electrodes and the solid electrolyte, one of the two electrodes is made of a metal performing catalytic action, one end portion of the one electrode is embedded in the solid electrolyte to be fixed thereby, the other end portion of the one electrode projects outwardly of the solid electrolyte, a portion of the one electrode contacting with an outer surface of the solid electrolyte is hermetically sealed with a nonconductive layer of a heat-resistant material, and the other electrode is made of a porous metal performing catalytic action and is disposed on the outer surface of the solid electrolyte but preventing the other electrode from being in contact with the one electrode.
Further, the oxygen concentration sensing apparatus may be provided with an electric circuit for making an electric current flow intermittently from the one electrode through the solid electrolyte to the other electrode thereby to maintain the oxygen concentration at the boundary between the one electrode and the solid electrolyte at a constant level.
REFERENCES:
patent: 2782103 (1957-02-01), Prentiss
patent: 3940327 (1976-02-01), Wagner et al.
patent: 4107019 (1978-08-01), Takao et al.
patent: 4130797 (1978-12-01), Hattori et al.
Miwa Naoto
Niwa Hitoshi
Ouki Masami
Suzuki Masatoshi
Kaplan G. L.
Nippondenso Co. Ltd.
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