Aluminosilicates compacts by alkoxide route: influence of Ba addition
Autor(a) principal: | |
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Data de Publicação: | 1999 |
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=S0366-69131999000100007 |
Resumo: | The sol-gel route was employed to obtain three different powders with the stoichiometric composition corresponding to mullite (3 Al2O3.2SiO2): (i) commercial alumina and silica from sol-gel, (ii) alumina and silica by alkoxide partial hydrolysis, (iii) alumina and silica by alkoxide simultaneous hydrolysis. Tetraethylorthosilicate (TEOS) and aluminium tri-sec-butoxide were used as alkoxide precursor. Moreover, 5 wt% of barium, incorporated to precursor solutions as Ba-acetilacetonate, was used as additive to study its influence on densification and mullite phase formation. The precursor powders were pressed uniaxially to form green compacts, after that all samples were heated to 1350 °C for 2 hours to obtain densified pellets. X-ray diffration patterns of powders, obtained by milling of sintering compacts, showed important differences. In barium doped samples a higher grade of densification and a greater glassy phase formation were observed. |
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Aluminosilicates compacts by alkoxide route: influence of Ba additionsol-gelbariumalkoxidesaluminosilicatesThe sol-gel route was employed to obtain three different powders with the stoichiometric composition corresponding to mullite (3 Al2O3.2SiO2): (i) commercial alumina and silica from sol-gel, (ii) alumina and silica by alkoxide partial hydrolysis, (iii) alumina and silica by alkoxide simultaneous hydrolysis. Tetraethylorthosilicate (TEOS) and aluminium tri-sec-butoxide were used as alkoxide precursor. Moreover, 5 wt% of barium, incorporated to precursor solutions as Ba-acetilacetonate, was used as additive to study its influence on densification and mullite phase formation. The precursor powders were pressed uniaxially to form green compacts, after that all samples were heated to 1350 °C for 2 hours to obtain densified pellets. X-ray diffration patterns of powders, obtained by milling of sintering compacts, showed important differences. In barium doped samples a higher grade of densification and a greater glassy phase formation were observed.Associação Brasileira de Cerâmica1999-02-01info:eu-repo/semantics/articleinfo:eu-repo/semantics/publishedVersiontext/htmlhttp://old.scielo.br/scielo.php?script=sci_arttext&pid=S0366-69131999000100007Cerâmica v.45 n.291 1999reponame:Cerâmica (São Paulo. Online)instname:Universidade de São Paulo (USP)instacron:USP10.1590/S0366-69131999000100007info:eu-repo/semantics/openAccessQuaranta,N. E.Benavidez,E. R.eng2000-06-01T00:00:00Zoai:scielo:S0366-69131999000100007Revistahttps://www.scielo.br/j/ce/PUBhttps://old.scielo.br/oai/scielo-oai.phpceram.abc@gmail.com||ceram.abc@gmail.com1678-45530366-6913opendoar:2000-06-01T00:00Cerâmica (São Paulo. Online) - Universidade de São Paulo (USP)false |
dc.title.none.fl_str_mv |
Aluminosilicates compacts by alkoxide route: influence of Ba addition |
title |
Aluminosilicates compacts by alkoxide route: influence of Ba addition |
spellingShingle |
Aluminosilicates compacts by alkoxide route: influence of Ba addition Quaranta,N. E. sol-gel barium alkoxides aluminosilicates |
title_short |
Aluminosilicates compacts by alkoxide route: influence of Ba addition |
title_full |
Aluminosilicates compacts by alkoxide route: influence of Ba addition |
title_fullStr |
Aluminosilicates compacts by alkoxide route: influence of Ba addition |
title_full_unstemmed |
Aluminosilicates compacts by alkoxide route: influence of Ba addition |
title_sort |
Aluminosilicates compacts by alkoxide route: influence of Ba addition |
author |
Quaranta,N. E. |
author_facet |
Quaranta,N. E. Benavidez,E. R. |
author_role |
author |
author2 |
Benavidez,E. R. |
author2_role |
author |
dc.contributor.author.fl_str_mv |
Quaranta,N. E. Benavidez,E. R. |
dc.subject.por.fl_str_mv |
sol-gel barium alkoxides aluminosilicates |
topic |
sol-gel barium alkoxides aluminosilicates |
description |
The sol-gel route was employed to obtain three different powders with the stoichiometric composition corresponding to mullite (3 Al2O3.2SiO2): (i) commercial alumina and silica from sol-gel, (ii) alumina and silica by alkoxide partial hydrolysis, (iii) alumina and silica by alkoxide simultaneous hydrolysis. Tetraethylorthosilicate (TEOS) and aluminium tri-sec-butoxide were used as alkoxide precursor. Moreover, 5 wt% of barium, incorporated to precursor solutions as Ba-acetilacetonate, was used as additive to study its influence on densification and mullite phase formation. The precursor powders were pressed uniaxially to form green compacts, after that all samples were heated to 1350 °C for 2 hours to obtain densified pellets. X-ray diffration patterns of powders, obtained by milling of sintering compacts, showed important differences. In barium doped samples a higher grade of densification and a greater glassy phase formation were observed. |
publishDate |
1999 |
dc.date.none.fl_str_mv |
1999-02-01 |
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=S0366-69131999000100007 |
url |
http://old.scielo.br/scielo.php?script=sci_arttext&pid=S0366-69131999000100007 |
dc.language.iso.fl_str_mv |
eng |
language |
eng |
dc.relation.none.fl_str_mv |
10.1590/S0366-69131999000100007 |
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.45 n.291 1999 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_ |
1748936779419877376 |