Oxygen sensor ceramic and process for preparing the same

Details Oxygen sensor ceramic and process for preparing the same Oxygen sensor ceramic and process for preparing the same

1979-10-01

1981-05-12

Vertiz, O. R.

Compositions: coating or plastic

Coating or plastic compositions

Metal-depositing composition or substrate-sensitizing...

C04B 3548, C01N 2758

Patent

active

042669790

ABSTRACT:
Oxygen sensor ceramic of solid electrolyte of zirconia-yttria system comprises aggregates of cubic zirconia grains having an average grain size of 2-10 .mu.m and monoclinic zirconia grains having an average grain size of 0.2-1 .mu.m, the appregates of the cubic zirconia grains being in contact with one another, and the monoclinic zirconia grains being distributed as aggregates in clearances among the aggregates of the cubic zirconia grains, and has a high thermal shock resistance, a high mechanical strength and a resistivity equal to that of the ceramic consisting only of cubic zirconia grains. The oxygen sensor ceramic is prepared by mixing zirconia powder having a grain size of 0.1-0.5 .mu.m with 4-8% by mole of yttria powder having an average grain size of 0.5-5 .mu.m, on the basis of total mixture, and molding and firing the mixture at 1,400.degree.-1,550.degree. C.

REFERENCES:
patent: 3334962 (1967-08-01), Clearfield
patent: 3533815 (1970-10-01), Baldwin
patent: 3620781 (1971-11-01), Garvie
patent: 4183798 (1980-01-01), Esper et al.
Wheat, T. A., "Microstructure of Thermal-Shock Resistant Zirconia" Journal Canadian Ceramic Society, vol. 44, 1975 pp. 7-15.
Dueker, H., et al., "Ceramic Aspects of the Bosch Lambda-Sensor," Paper Delivered at Automotive Engineering Congress and Exposition, Detroit, Mich., Feb. 24-28, 1975, Society of Automotive Engineers. _

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