Fabrication and characterization of dielectric ceramics using alumina and aluminosilicates
Autor(a) principal: | |
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Data de Publicação: | 2020 |
Outros Autores: | , , , |
Tipo de documento: | Artigo |
Idioma: | eng |
Título da fonte: | Cerâmica (São Paulo. Online) |
Texto Completo: | http://old.scielo.br/scielo.php?script=sci_arttext&pid=S0366-69132020000100056 |
Resumo: | Abstract The aim was to study formulations containing aluminosilicate and alumina in order to obtain compositions with suitable properties to fabricate dielectric ceramic devices. Initially, the precursors were subjected to chemical, mineralogical and granulometric characterization. The formulations were defined and specimens were pressed (19.6 MPa) in shapes of disc and rectangular bar. Specimens were dried, heat-treated at 1400, 1450 and 1500 °C and the mineralogical, morphological, physical, dielectric and mechanical properties were evaluated. The relative dielectric constant (εr) and loss tangent (tanδ) were evaluated at 0.1, 1, 10 and 100 kHz at room temperature. The mullite was the major phase for the studied temperature range. Compositions with a higher content of fluxes showed lower porosity and better dielectric properties and flexural strength. Values of εr at 1 kHz (~3.5 to 4.5) were close to that of the mullite for the samples fired at 1400 °C. |
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Cerâmica (São Paulo. Online) |
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Fabrication and characterization of dielectric ceramics using alumina and aluminosilicatesaluminosilicatesmullitedielectric propertiesAbstract The aim was to study formulations containing aluminosilicate and alumina in order to obtain compositions with suitable properties to fabricate dielectric ceramic devices. Initially, the precursors were subjected to chemical, mineralogical and granulometric characterization. The formulations were defined and specimens were pressed (19.6 MPa) in shapes of disc and rectangular bar. Specimens were dried, heat-treated at 1400, 1450 and 1500 °C and the mineralogical, morphological, physical, dielectric and mechanical properties were evaluated. The relative dielectric constant (εr) and loss tangent (tanδ) were evaluated at 0.1, 1, 10 and 100 kHz at room temperature. The mullite was the major phase for the studied temperature range. Compositions with a higher content of fluxes showed lower porosity and better dielectric properties and flexural strength. Values of εr at 1 kHz (~3.5 to 4.5) were close to that of the mullite for the samples fired at 1400 °C.Associação Brasileira de Cerâmica2020-03-01info:eu-repo/semantics/articleinfo:eu-repo/semantics/publishedVersiontext/htmlhttp://old.scielo.br/scielo.php?script=sci_arttext&pid=S0366-69132020000100056Cerâmica v.66 n.377 2020reponame:Cerâmica (São Paulo. Online)instname:Universidade de São Paulo (USP)instacron:USP10.1590/0366-69132020663772808info:eu-repo/semantics/openAccessCarvalho,R. S.Silva,V. J. daNóbrega,R. B. daLira,H. L.Santana,L. N. L.eng2019-12-10T00:00:00Zoai:scielo:S0366-69132020000100056Revistahttps://www.scielo.br/j/ce/PUBhttps://old.scielo.br/oai/scielo-oai.phpceram.abc@gmail.com||ceram.abc@gmail.com1678-45530366-6913opendoar:2019-12-10T00:00Cerâmica (São Paulo. Online) - Universidade de São Paulo (USP)false |
dc.title.none.fl_str_mv |
Fabrication and characterization of dielectric ceramics using alumina and aluminosilicates |
title |
Fabrication and characterization of dielectric ceramics using alumina and aluminosilicates |
spellingShingle |
Fabrication and characterization of dielectric ceramics using alumina and aluminosilicates Carvalho,R. S. aluminosilicates mullite dielectric properties |
title_short |
Fabrication and characterization of dielectric ceramics using alumina and aluminosilicates |
title_full |
Fabrication and characterization of dielectric ceramics using alumina and aluminosilicates |
title_fullStr |
Fabrication and characterization of dielectric ceramics using alumina and aluminosilicates |
title_full_unstemmed |
Fabrication and characterization of dielectric ceramics using alumina and aluminosilicates |
title_sort |
Fabrication and characterization of dielectric ceramics using alumina and aluminosilicates |
author |
Carvalho,R. S. |
author_facet |
Carvalho,R. S. Silva,V. J. da Nóbrega,R. B. da Lira,H. L. Santana,L. N. L. |
author_role |
author |
author2 |
Silva,V. J. da Nóbrega,R. B. da Lira,H. L. Santana,L. N. L. |
author2_role |
author author author author |
dc.contributor.author.fl_str_mv |
Carvalho,R. S. Silva,V. J. da Nóbrega,R. B. da Lira,H. L. Santana,L. N. L. |
dc.subject.por.fl_str_mv |
aluminosilicates mullite dielectric properties |
topic |
aluminosilicates mullite dielectric properties |
description |
Abstract The aim was to study formulations containing aluminosilicate and alumina in order to obtain compositions with suitable properties to fabricate dielectric ceramic devices. Initially, the precursors were subjected to chemical, mineralogical and granulometric characterization. The formulations were defined and specimens were pressed (19.6 MPa) in shapes of disc and rectangular bar. Specimens were dried, heat-treated at 1400, 1450 and 1500 °C and the mineralogical, morphological, physical, dielectric and mechanical properties were evaluated. The relative dielectric constant (εr) and loss tangent (tanδ) were evaluated at 0.1, 1, 10 and 100 kHz at room temperature. The mullite was the major phase for the studied temperature range. Compositions with a higher content of fluxes showed lower porosity and better dielectric properties and flexural strength. Values of εr at 1 kHz (~3.5 to 4.5) were close to that of the mullite for the samples fired at 1400 °C. |
publishDate |
2020 |
dc.date.none.fl_str_mv |
2020-03-01 |
dc.type.driver.fl_str_mv |
info:eu-repo/semantics/article |
dc.type.status.fl_str_mv |
info:eu-repo/semantics/publishedVersion |
format |
article |
status_str |
publishedVersion |
dc.identifier.uri.fl_str_mv |
http://old.scielo.br/scielo.php?script=sci_arttext&pid=S0366-69132020000100056 |
url |
http://old.scielo.br/scielo.php?script=sci_arttext&pid=S0366-69132020000100056 |
dc.language.iso.fl_str_mv |
eng |
language |
eng |
dc.relation.none.fl_str_mv |
10.1590/0366-69132020663772808 |
dc.rights.driver.fl_str_mv |
info:eu-repo/semantics/openAccess |
eu_rights_str_mv |
openAccess |
dc.format.none.fl_str_mv |
text/html |
dc.publisher.none.fl_str_mv |
Associação Brasileira de Cerâmica |
publisher.none.fl_str_mv |
Associação Brasileira de Cerâmica |
dc.source.none.fl_str_mv |
Cerâmica v.66 n.377 2020 reponame:Cerâmica (São Paulo. Online) instname:Universidade de São Paulo (USP) instacron:USP |
instname_str |
Universidade de São Paulo (USP) |
instacron_str |
USP |
institution |
USP |
reponame_str |
Cerâmica (São Paulo. Online) |
collection |
Cerâmica (São Paulo. Online) |
repository.name.fl_str_mv |
Cerâmica (São Paulo. Online) - Universidade de São Paulo (USP) |
repository.mail.fl_str_mv |
ceram.abc@gmail.com||ceram.abc@gmail.com |
_version_ |
1748936784655417344 |