Chemistry: electrical and wave energy – Processes and products – Vacuum arc discharge coating
Patent
1975-01-08
1976-11-02
Tung, T.
Chemistry: electrical and wave energy
Processes and products
Vacuum arc discharge coating
G01N 2746
Patent
active
039896145
ABSTRACT:
A transducer operative to generate an electrical signal proportional to the partial oxygen pressure in a gas consists of a tube, closed at one end, of zirconia stabilized with yttria. The outer surface of the tube is coated with a porous electronic conductor and a porous platinum layer is coated over the porous conductor so that the platinum contacts the zirconia tubes at the voids in the conductor coating. Electrodes attached to the inner and outer surfaces of the tube sense the potential difference generated across the tube as a result of galvanic action. The open end of the tube is encased within a ceramic cylinder having an outer metal threaded sleeve. Electrodes attached to the inner and outer surfaces of the tube are joined to a connector fixed at the far end of the ceramic tubes. A second embodiment employs a sensor consisting of a transition metal oxide pad and a thermistor pad on a ceramic substrate bonded to a second substrate containing a deposited resistance element so as to hermetically seal the element. The sensor is encased in a ceramic cylinder having an outer metal threaded sleeve.
REFERENCES:
patent: 3400054 (1968-09-01), Ruka et al.
patent: 3619381 (1971-11-01), Fitterer
patent: 3841987 (1974-10-01), Friese et al.
patent: 3844920 (1974-10-01), Burgett et al.
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