Autor(es)

Caproni, E. ^[1] ; Gouvea, D. ^[2] ; Muccillo, R. ^[1]

Afiliação do(s) autor(es)

^[1] Energy & Nucl Res Inst, Ctr Sci & Technol Mat, BR-05508900 Sao Paulo, SP - Brazil

^[2] Univ S Paulo, Polytech Sch, Dept Met Engn & Mat, BR-05508030 Sao Paulo, SP - Brazil

• Tipo de documento: Artigo Científico
• Fonte: CERAMICS INTERNATIONAL; v. 37, n. 1, p. 273-277, JAN 2011.
• Citações Web of Science: 9

Resumo

The electrophoretic deposition technique was used for the preparation of ZrO(2):8 mol% Y(2)O(3) (yttria-stabilized zirconia, 8YSZ) closed end tubes for application in high temperature oxygen sensing devices. The 8YSZ ceramic suspensions with different average particle sizes were investigated looking for the best conditions for electrophoretic deposition of thin wall closed end ceramic tubes. High deposition rate of the ceramic particles onto graphite were obtained with isopropanol as solvent and 4-hydroxybenzoic acid as dispersant, with good surface quality of the deposited layer. The green tubes were dried and sintered at 1500 degrees C, and their properties were analyzed by X-ray diffraction for determination of the structural phases, scanning probe microscopy for observation of grain morphology, and impedance spectroscopy for evaluation of the oxide ion electrical resistivity. Pt/YSZ tube/Pt electrochemical cells were assembled for exposure to oxygen in the 60-650 ppm range using an electrochemical YSZ oxygen pump and sensor system. The signal response of the electrophoretic deposited sensor was similar to the response of the sensor of the oxygen pump. Several thin wall 4 mm diameter x 30 mm length closed end tubes may be obtained in a single operation, showing the ability of this technique for processing large quantities of tubular solid electrolytes with electrical properties suitable for use in high temperature devices. (C) 2010 Elsevier Ltd and Techna Group S.r.l. All rights reserved. (AU)

• Processo FAPESP: 05/53241-9 - Estudo de fenômenos intergranulares em materiais cerâmicos
• Beneficiário: Reginaldo Muccillo
• Modalidade de apoio: Auxílio à Pesquisa - Temático
• Processo FAPESP: 06/61025-7 - Conformação por eletroforese e sinterização de sensores eletroquímicos tubulares para a detecção de oxigênio a altas temperaturas
• Beneficiário: Érica Caproni
• Modalidade de apoio: Bolsas no Brasil - Pós-Doutorado