SnO2 Dense Ceramic Microwave Sintered with Low Resistivity
| Autor: | Leinig Antonio Perazolli, José A. Varela, Gisane Gasparotto, Cesar Renato Foschini, Natalia Jaomaci, E. C. Aguiar, Miguel Ruiz, Maria Aparecida Zaghete Bertochi |
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| Rok vydání: | 2012 |
| Předmět: | |
| Zdroj: | Materials Sciences and Applications. :272-280 |
| ISSN: | 2153-1188 2153-117X |
| Popis: | The Hall-Heroult process is used for alumina reduction by the use of graphite anodes even though it involves a high emission of carbon dioxide (CO2) and several other organic compounds. Proposals have been made aiming at substituting graphite for a single-phase SnO2-based ceramic with low resistivity and chemical resistance to cryolite, which is characterized as an inconsumable anode, reducing pollutant emissions. To this end, a wide range of studies were carried out on SnO2-based ceramics modified with ZnO as a densification aid doped with the promoters of electrical conductivity such as Nb2O5, Al2O3 and Sb2O3 through a mixture of oxides and hybrid sintering in a microwave oven. The pressed pellets were sintered in a microwave oven up to 1050℃ under a constant heating rate of 10℃/min. After sintering, the density was determined by the Archimedes method, the phases were then characterized by X-ray diffraction, the microstructure and chemical composition resulting from the sintered SnO2-based ceramics were also investigated by field emission scanning electron microscopy (FE-SEM) coupled with an energy-dispersive X-ray spectroscopy (EDS) and the electrical properties were determined by the measurements of the electric field x current density. A single-phase ceramic was obtained with a relative density of above 90% and electrical resistivity of 6.1 Ω·cm at room temperature. The ceramics obtained in this study could be a potential candidate as an inconsumable anode to replace the current fused coke used in the reduction of alumina. |
| Databáze: | OpenAIRE |
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