The ZrO2 electrolyte exhaust gas sensor was developed as the feedback signal device for control of engine air: fuel ratio at the stoichiometric ratio. The exhaust gas sensor electrolyte is ZrO2, typically stabilized with CaO or Y2O3. Because of various operating advantages, the Y2O3-ZrO2 ceramic is preferred. However, its cost is significantly greater than the CaO body. Data are presented on a series of MgO-Y2O3-stabilized zirconias that can be used in place of the Y2O3 fully stabilized material. The sintered MgO-Y2O3-ZrO2 ceramic was fully stabilized and remained so after extended exposure in an engine durability test. The ceramic displayed some segregation of MgO throughout the matrix and a resistivity at typical exhaust temperatures (ungefaehr gleich 600C) four to nine times higher than that of the MgO-Y2O3-ZrO2 compositions. However, the ternary compositions appeared to be less expensive, reliable substitutes for the standard 8 mol% Y2O3-ZrO2 ceramic in the exhaust sensor application.
MgO-Y2O3-stabilized ZrO2 ceramics in exhaust gas sensor
MgO-Y2O3-stabilisierte ZrO2-Keramik in Abgassonden
American Ceramic Society Bulletin ; 56 , 5 ; 509-512
1977
4 Seiten, 12 Quellen
Aufsatz (Zeitschrift)
Englisch
SAE Technical Papers | 1977
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