Paper Title:

Preparation and Characterization of Zirconia-Yttria/Zirconia-Magnesia Composites

Periodical Materials Science Forum (Volumes 530 - 531)
Main Theme Advanced Powder Technology V
Edited by Lucio Salgado and Francisco Ambrozio Filho
Pages 389-394
DOI 10.4028/www.scientific.net/MSF.530-531.389
Citation E. Caproni et al., 2006, Materials Science Forum, 530-531, 389
Online since November, 2006
Authors E. Caproni, R. Muccillo
Keywords Ceramic Composite, Impedance Spectroscopy, Oxygen Sensor, Solid Electrolyte, Zirconia
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ZrO2: 3mol% Y2O3 powders were mixed in different proportions to ZrO2: 8 mol% MgO, pressed and sintered at 1500°C for producing composites with oxygen ion conductivity better than that of ZrO2: 8 mol% MgO and thermal shock resistance better than that of ZrO2: 3 mol% Y2O3. The electrical conductivity was evaluated by the impedance spectroscopy technique at 600°C as a function of the partial pressure of oxygen using zirconia-based oxygen pump and sensor. The thermal shock resistance was studied by room temperature- 1550°C dilatometry on sintered pellets. Moreover the composites were studied by X-ray diffraction and scanning electron microscopy. All composites are partially stabilized in the monoclinic-tetragonal phase and the apparent density is higher than 90% of the theoretical density. The thermal shock behavior of the composites is similar to that of ZrO2:8 mol% MgO materials used in disposable high temperature oxygen sensors. The electrical response of the composites at high temperatures is better than the electrical response of ZrO2:8 mol% MgO.

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