Title: Solid closed ended tubular oxygen sensor

Abstract: A solid closed ended tubular oxygen sensor element, particularly useful for sensing the oxygen content of exhaust gases from internal combustion engines. The closed end of the tubular element which is adapted to be exposed to the hot exhaust gases is made of zirconium oxide stabilized with yttrium oxide and/or ytterbium dioxide. The remaining main portion of the tubular element is made of zirconium dioxide stabilized with calcium oxide. The invention also provides methods of manufacturing these tubular elements.

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Inventors: Pollner, Rudolf (Bamberg, DE, US)

Application Number: 868627
Filing Date: 1978-01-11
Publication_date: 1979-05-01
Assignee: Robert Bosch GmbH (Stuttgart, DE)
Primary Class(es): 204/427
Other Classes:
US Patent Ref:

3723279	Mar, 1973	Fruehan et al.	204/195.
3776831	Dec, 1973	Roy et al.	204/195.
3791954	Feb, 1974	Makoto et al.	204/195.

Other Refs:
Primary Examiner: Kaplan, G. L.
Assistant Examiner:
Attorney: Frishauf, Holtz, Goodman & Woodward