SnO2 dense ceramic microwave sintered with low resistivity
Autor(a) principal: | |
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Data de Publicação: | 2012 |
Outros Autores: | , , , , , , |
Tipo de documento: | Artigo |
Idioma: | eng |
Título da fonte: | Repositório Institucional da UNESP |
Texto Completo: | http://www.scirp.org/journal/PaperInformation.aspx?PaperID=19190#.VUzvoI5VhHw http://hdl.handle.net/11449/123478 |
Resumo: | The Hall-Héroult 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 substitut- ing 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 conduc- tivity 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°C under a constant heating rate of 10°C/min. After sin- tering, 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 × 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. |
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Repositório Institucional da UNESP |
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SnO2 dense ceramic microwave sintered with low resistivityTin OxideAnodic ElectrodeInconsumable AnodeMicrowave SinteringElectrical ResistivityThe Hall-Héroult 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 substitut- ing 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 conduc- tivity 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°C under a constant heating rate of 10°C/min. After sin- tering, 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 × 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.Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq)Coordenação de Aprefeiçoamento de Pessoal de Nível Superior (CAPES)Fundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP)Universidade Estadual Paulista Júlio de Mesquita Filho, Instituto de Química de AraraquaraUniversidade Estadual Paulista (Unesp)Perazolli, Leinig Antonio [UNESP]Gasparotto, Gisane [UNESP]Jaomaci, Natalia [UNESP]Ruiz, Miguel [UNESP]Zaghete, Maria Aparecida [UNESP]Foschini, Cesar Renato [UNESP]Aguiar, Ederson Carlos [UNESP]Varela, José Arana [UNESP]2015-05-15T13:30:16Z2015-05-15T13:30:16Z2012info:eu-repo/semantics/publishedVersioninfo:eu-repo/semantics/article272-280application/pdfhttp://www.scirp.org/journal/PaperInformation.aspx?PaperID=19190#.VUzvoI5VhHwMaterials Sciences and Applications, v. 3, p. 272-280, 2012.2153-117Xhttp://hdl.handle.net/11449/12347810.4236/msa.2012.35040ISSN2153-117X-2012-03-272-280.pdf323394251149658338227236272846191922357184842767787545459412341924957214097974664758829897373572161721861666080318073992142392000000-0003-1300-4978Currículo Lattesreponame:Repositório Institucional da UNESPinstname:Universidade Estadual Paulista (UNESP)instacron:UNESPengMaterials Sciences and Applicationsinfo:eu-repo/semantics/openAccess2024-06-28T13:54:58Zoai:repositorio.unesp.br:11449/123478Repositório InstitucionalPUBhttp://repositorio.unesp.br/oai/requestopendoar:29462024-08-05T19:24:31.691951Repositório Institucional da UNESP - Universidade Estadual Paulista (UNESP)false |
dc.title.none.fl_str_mv |
SnO2 dense ceramic microwave sintered with low resistivity |
title |
SnO2 dense ceramic microwave sintered with low resistivity |
spellingShingle |
SnO2 dense ceramic microwave sintered with low resistivity Perazolli, Leinig Antonio [UNESP] Tin Oxide Anodic Electrode Inconsumable Anode Microwave Sintering Electrical Resistivity |
title_short |
SnO2 dense ceramic microwave sintered with low resistivity |
title_full |
SnO2 dense ceramic microwave sintered with low resistivity |
title_fullStr |
SnO2 dense ceramic microwave sintered with low resistivity |
title_full_unstemmed |
SnO2 dense ceramic microwave sintered with low resistivity |
title_sort |
SnO2 dense ceramic microwave sintered with low resistivity |
author |
Perazolli, Leinig Antonio [UNESP] |
author_facet |
Perazolli, Leinig Antonio [UNESP] Gasparotto, Gisane [UNESP] Jaomaci, Natalia [UNESP] Ruiz, Miguel [UNESP] Zaghete, Maria Aparecida [UNESP] Foschini, Cesar Renato [UNESP] Aguiar, Ederson Carlos [UNESP] Varela, José Arana [UNESP] |
author_role |
author |
author2 |
Gasparotto, Gisane [UNESP] Jaomaci, Natalia [UNESP] Ruiz, Miguel [UNESP] Zaghete, Maria Aparecida [UNESP] Foschini, Cesar Renato [UNESP] Aguiar, Ederson Carlos [UNESP] Varela, José Arana [UNESP] |
author2_role |
author author author author author author author |
dc.contributor.none.fl_str_mv |
Universidade Estadual Paulista (Unesp) |
dc.contributor.author.fl_str_mv |
Perazolli, Leinig Antonio [UNESP] Gasparotto, Gisane [UNESP] Jaomaci, Natalia [UNESP] Ruiz, Miguel [UNESP] Zaghete, Maria Aparecida [UNESP] Foschini, Cesar Renato [UNESP] Aguiar, Ederson Carlos [UNESP] Varela, José Arana [UNESP] |
dc.subject.por.fl_str_mv |
Tin Oxide Anodic Electrode Inconsumable Anode Microwave Sintering Electrical Resistivity |
topic |
Tin Oxide Anodic Electrode Inconsumable Anode Microwave Sintering Electrical Resistivity |
description |
The Hall-Héroult 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 substitut- ing 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 conduc- tivity 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°C under a constant heating rate of 10°C/min. After sin- tering, 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 × 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. |
publishDate |
2012 |
dc.date.none.fl_str_mv |
2012 2015-05-15T13:30:16Z 2015-05-15T13:30:16Z |
dc.type.status.fl_str_mv |
info:eu-repo/semantics/publishedVersion |
dc.type.driver.fl_str_mv |
info:eu-repo/semantics/article |
format |
article |
status_str |
publishedVersion |
dc.identifier.uri.fl_str_mv |
http://www.scirp.org/journal/PaperInformation.aspx?PaperID=19190#.VUzvoI5VhHw Materials Sciences and Applications, v. 3, p. 272-280, 2012. 2153-117X http://hdl.handle.net/11449/123478 10.4236/msa.2012.35040 ISSN2153-117X-2012-03-272-280.pdf 3233942511496583 3822723627284619 1922357184842767 7875454594123419 2495721409797466 4758829897373572 1617218616660803 1807399214239200 0000-0003-1300-4978 |
url |
http://www.scirp.org/journal/PaperInformation.aspx?PaperID=19190#.VUzvoI5VhHw http://hdl.handle.net/11449/123478 |
identifier_str_mv |
Materials Sciences and Applications, v. 3, p. 272-280, 2012. 2153-117X 10.4236/msa.2012.35040 ISSN2153-117X-2012-03-272-280.pdf 3233942511496583 3822723627284619 1922357184842767 7875454594123419 2495721409797466 4758829897373572 1617218616660803 1807399214239200 0000-0003-1300-4978 |
dc.language.iso.fl_str_mv |
eng |
language |
eng |
dc.relation.none.fl_str_mv |
Materials Sciences and Applications |
dc.rights.driver.fl_str_mv |
info:eu-repo/semantics/openAccess |
eu_rights_str_mv |
openAccess |
dc.format.none.fl_str_mv |
272-280 application/pdf |
dc.source.none.fl_str_mv |
Currículo Lattes reponame:Repositório Institucional da UNESP instname:Universidade Estadual Paulista (UNESP) instacron:UNESP |
instname_str |
Universidade Estadual Paulista (UNESP) |
instacron_str |
UNESP |
institution |
UNESP |
reponame_str |
Repositório Institucional da UNESP |
collection |
Repositório Institucional da UNESP |
repository.name.fl_str_mv |
Repositório Institucional da UNESP - Universidade Estadual Paulista (UNESP) |
repository.mail.fl_str_mv |
|
_version_ |
1808129064078147584 |