Designing Colloidal Silica-Bonded Porous Structures of In-situ Mullite for Thermal Insulation
Autor(a) principal: | |
---|---|
Data de Publicação: | 2020 |
Outros Autores: | , , , , |
Tipo de documento: | Artigo |
Idioma: | eng |
Título da fonte: | Repositório Institucional da UNESP |
Texto Completo: | http://dx.doi.org/10.1007/s42411-020-0120-x http://hdl.handle.net/11449/221560 |
Resumo: | Abstract: Colloidal silica (CS) is a promising raw material for refractory castable ceramics. It consists of stable suspensions of synthetic amorphous silica nanoparticles that behave simultaneously as liquid medium and binder for ceramic particles and as a porogenic agent and highly reactive source of silica to promote in-situ reactions. The setting mechanism of CS balances two opposite effects. Adding more CS to a suspension increases the bonding potential for gelling reactions and strengthening; on the other hand, it also introduces more water into the system, enhancing pore content. Such effects can be advantageously employed in the preparation of porous structures from aqueous suspensions and applied as high-temperature thermal insulators. The present study addresses the production of porous structures of in-situ mullite attained from aqueous suspensions of highly porous transition alumina particles bonded with colloidal silica. Different grades of CS and transition aluminas were combined to present suitable workability (flowability and gelling time) and to generate stoichiometric mullite or mullite-alumina porous structures after sintering. |
id |
UNSP_c660889ad2a74db5c4a578f2897d4dd5 |
---|---|
oai_identifier_str |
oai:repositorio.unesp.br:11449/221560 |
network_acronym_str |
UNSP |
network_name_str |
Repositório Institucional da UNESP |
repository_id_str |
2946 |
spelling |
Designing Colloidal Silica-Bonded Porous Structures of In-situ Mullite for Thermal Insulationcoral-likeKeywords: colloidal silicaporous mullite structuresthermal insulationtransition aluminaAbstract: Colloidal silica (CS) is a promising raw material for refractory castable ceramics. It consists of stable suspensions of synthetic amorphous silica nanoparticles that behave simultaneously as liquid medium and binder for ceramic particles and as a porogenic agent and highly reactive source of silica to promote in-situ reactions. The setting mechanism of CS balances two opposite effects. Adding more CS to a suspension increases the bonding potential for gelling reactions and strengthening; on the other hand, it also introduces more water into the system, enhancing pore content. Such effects can be advantageously employed in the preparation of porous structures from aqueous suspensions and applied as high-temperature thermal insulators. The present study addresses the production of porous structures of in-situ mullite attained from aqueous suspensions of highly porous transition alumina particles bonded with colloidal silica. Different grades of CS and transition aluminas were combined to present suitable workability (flowability and gelling time) and to generate stoichiometric mullite or mullite-alumina porous structures after sintering.Materials Engineering Department São Carlos School of Engineering University of São PauloSchool of Dentistry São Paulo State Universityechanical Engineering Department Pontifícia Universidad Católica del PerúNouryon South AmericaSchool of Dentistry São Paulo State UniversityUniversidade de São Paulo (USP)Universidade Estadual Paulista (UNESP)Pontifícia Universidad Católica del PerúNouryon South Americade Mendonça Spera, N. C.Fernandes, L. [UNESP]Sakihama, J.Santos Martinatti, I.Tiba, P.Salomão, R.2022-04-28T19:29:21Z2022-04-28T19:29:21Z2020-09-01info:eu-repo/semantics/publishedVersioninfo:eu-repo/semantics/article54-63http://dx.doi.org/10.1007/s42411-020-0120-xInterCeram: International Ceramic Review, v. 69, n. 4-5, p. 54-63, 2020.0020-5214http://hdl.handle.net/11449/22156010.1007/s42411-020-0120-x2-s2.0-85091335600Scopusreponame:Repositório Institucional da UNESPinstname:Universidade Estadual Paulista (UNESP)instacron:UNESPengInterCeram: International Ceramic Reviewinfo:eu-repo/semantics/openAccess2022-04-28T19:29:21Zoai:repositorio.unesp.br:11449/221560Repositório InstitucionalPUBhttp://repositorio.unesp.br/oai/requestopendoar:29462022-04-28T19:29:21Repositório Institucional da UNESP - Universidade Estadual Paulista (UNESP)false |
dc.title.none.fl_str_mv |
Designing Colloidal Silica-Bonded Porous Structures of In-situ Mullite for Thermal Insulation |
title |
Designing Colloidal Silica-Bonded Porous Structures of In-situ Mullite for Thermal Insulation |
spellingShingle |
Designing Colloidal Silica-Bonded Porous Structures of In-situ Mullite for Thermal Insulation de Mendonça Spera, N. C. coral-like Keywords: colloidal silica porous mullite structures thermal insulation transition alumina |
title_short |
Designing Colloidal Silica-Bonded Porous Structures of In-situ Mullite for Thermal Insulation |
title_full |
Designing Colloidal Silica-Bonded Porous Structures of In-situ Mullite for Thermal Insulation |
title_fullStr |
Designing Colloidal Silica-Bonded Porous Structures of In-situ Mullite for Thermal Insulation |
title_full_unstemmed |
Designing Colloidal Silica-Bonded Porous Structures of In-situ Mullite for Thermal Insulation |
title_sort |
Designing Colloidal Silica-Bonded Porous Structures of In-situ Mullite for Thermal Insulation |
author |
de Mendonça Spera, N. C. |
author_facet |
de Mendonça Spera, N. C. Fernandes, L. [UNESP] Sakihama, J. Santos Martinatti, I. Tiba, P. Salomão, R. |
author_role |
author |
author2 |
Fernandes, L. [UNESP] Sakihama, J. Santos Martinatti, I. Tiba, P. Salomão, R. |
author2_role |
author author author author author |
dc.contributor.none.fl_str_mv |
Universidade de São Paulo (USP) Universidade Estadual Paulista (UNESP) Pontifícia Universidad Católica del Perú Nouryon South America |
dc.contributor.author.fl_str_mv |
de Mendonça Spera, N. C. Fernandes, L. [UNESP] Sakihama, J. Santos Martinatti, I. Tiba, P. Salomão, R. |
dc.subject.por.fl_str_mv |
coral-like Keywords: colloidal silica porous mullite structures thermal insulation transition alumina |
topic |
coral-like Keywords: colloidal silica porous mullite structures thermal insulation transition alumina |
description |
Abstract: Colloidal silica (CS) is a promising raw material for refractory castable ceramics. It consists of stable suspensions of synthetic amorphous silica nanoparticles that behave simultaneously as liquid medium and binder for ceramic particles and as a porogenic agent and highly reactive source of silica to promote in-situ reactions. The setting mechanism of CS balances two opposite effects. Adding more CS to a suspension increases the bonding potential for gelling reactions and strengthening; on the other hand, it also introduces more water into the system, enhancing pore content. Such effects can be advantageously employed in the preparation of porous structures from aqueous suspensions and applied as high-temperature thermal insulators. The present study addresses the production of porous structures of in-situ mullite attained from aqueous suspensions of highly porous transition alumina particles bonded with colloidal silica. Different grades of CS and transition aluminas were combined to present suitable workability (flowability and gelling time) and to generate stoichiometric mullite or mullite-alumina porous structures after sintering. |
publishDate |
2020 |
dc.date.none.fl_str_mv |
2020-09-01 2022-04-28T19:29:21Z 2022-04-28T19:29:21Z |
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://dx.doi.org/10.1007/s42411-020-0120-x InterCeram: International Ceramic Review, v. 69, n. 4-5, p. 54-63, 2020. 0020-5214 http://hdl.handle.net/11449/221560 10.1007/s42411-020-0120-x 2-s2.0-85091335600 |
url |
http://dx.doi.org/10.1007/s42411-020-0120-x http://hdl.handle.net/11449/221560 |
identifier_str_mv |
InterCeram: International Ceramic Review, v. 69, n. 4-5, p. 54-63, 2020. 0020-5214 10.1007/s42411-020-0120-x 2-s2.0-85091335600 |
dc.language.iso.fl_str_mv |
eng |
language |
eng |
dc.relation.none.fl_str_mv |
InterCeram: International Ceramic Review |
dc.rights.driver.fl_str_mv |
info:eu-repo/semantics/openAccess |
eu_rights_str_mv |
openAccess |
dc.format.none.fl_str_mv |
54-63 |
dc.source.none.fl_str_mv |
Scopus 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_ |
1799965428446920704 |