Compositions: ceramic – Ceramic compositions – Refractory
Patent
1991-02-04
1992-06-16
Dixon, Jr., William R.
Compositions: ceramic
Ceramic compositions
Refractory
501152, 423608, C04B 3548
Patent
active
051224879
ABSTRACT:
As a solid electrolyte suitable for use in oxygen sensors a partially stabilized zirconia, which essentially consists of 4.5-6.0 mol % of Y.sub.2 O.sub.3 and the balance of ZrO.sub.2 and is constituted of tetragonal and cubic crystals, is produced by using a coprecipitated powder of a solid solution of ZrO.sub.2 and Y.sub.2 O.sub.3 as the raw material and performing sintering of a green body at a temperature not higher than 1500.degree. C. The ZrO.sub.2 -Y.sub.2 O.sub.3 powder has a mean particle size not larger than 1 .mu.m and a specific surface area in the range from 2.5 to 7 m.sup.2 /g and is required to be not more than 0.2 wt % in the content of unwanted SiO.sub.2 so that the sintered solid electrolyte may be as low as possible in the content of SiO.sub.2. The obtained solid electrolyte has good mechanical properties and exhibits sufficiently high withstand voltage.
REFERENCES:
patent: 3334962 (1967-08-01), Clearfield
patent: 4360598 (1982-11-01), Otagiri et al.
patent: 4370393 (1983-01-01), Watanabe et al.
patent: 4664894 (1987-05-01), Suzuki et al.
Ralph Petrucci, General Chemistry: Principles and Modern Applications (1982), 403-404.
Adachi Yutaka
Hayakawa Nobuhiro
Ishiguro Hiroyuki
Kitano Takeshi
Bonner Melissa
Dixon Jr. William R.
NGK Spark Plug Co. Ltd.
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