A New Insight into the Role of Silicate-Type Binders on the Crushing Strength of Alumina Foams
Autor(a) principal: | |
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Data de Publicação: | 2022 |
Outros Autores: | , , |
Tipo de documento: | Artigo |
Idioma: | eng |
Título da fonte: | Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos) |
Texto Completo: | http://hdl.handle.net/10400.9/3968 |
Resumo: | ABSTRACT: Semi-closed cell macroporous alumina foams with relative densities ranging from 0.26 to 0.35 have been produced by the well-established replication method based on the coating of a polyurethane (PU) template foam by a ceramic slurry, followed by burnout of the PU template, and sintering of the ceramic skeleton. Collapse of the three-dimensional structure upon the volatilisation of the PU sponge can only be prevented using appropriate binders. Scarce data are available on the slurry formulations of commercial alumina foams. The aim of this study was to investigate the influence of silicate-type binders, namely kaolin and bentonite additives, on the crushing strength of alumina foams. The highest crushing strength of around 10 MPa was observed at a porosity of 66 +/- 2%. The open-cell model is inadequate to fit the crushing strength data of such semi-closed cell type structures. Both microscopic and macroscopic flaws resulting from the foam processing method contribute to the wide scatter of the strength, thereby explaining the Weibull modulus ranging from 4 to 7. Both flaw populations require further improvement to maximise the crushing strength of these foams with high potential for the design of structured catalyst carriers and molten aluminium filters. |
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A New Insight into the Role of Silicate-Type Binders on the Crushing Strength of Alumina FoamsAluminaBindersMechanical propertiesABSTRACT: Semi-closed cell macroporous alumina foams with relative densities ranging from 0.26 to 0.35 have been produced by the well-established replication method based on the coating of a polyurethane (PU) template foam by a ceramic slurry, followed by burnout of the PU template, and sintering of the ceramic skeleton. Collapse of the three-dimensional structure upon the volatilisation of the PU sponge can only be prevented using appropriate binders. Scarce data are available on the slurry formulations of commercial alumina foams. The aim of this study was to investigate the influence of silicate-type binders, namely kaolin and bentonite additives, on the crushing strength of alumina foams. The highest crushing strength of around 10 MPa was observed at a porosity of 66 +/- 2%. The open-cell model is inadequate to fit the crushing strength data of such semi-closed cell type structures. Both microscopic and macroscopic flaws resulting from the foam processing method contribute to the wide scatter of the strength, thereby explaining the Weibull modulus ranging from 4 to 7. Both flaw populations require further improvement to maximise the crushing strength of these foams with high potential for the design of structured catalyst carriers and molten aluminium filters.MDPIRepositório do LNEGOliveira, Fernando Almeida CostaPommier, StéphaneFernandes, Jorge CruzDias, Diamantino2022-11-30T17:15:32Z2022-102022-10-01T00:00:00Zinfo:eu-repo/semantics/publishedVersioninfo:eu-repo/semantics/articleapplication/pdfhttp://hdl.handle.net/10400.9/3968engOliveira, Fernando de A. C... [et.al.] - A New Insight into the Role of Silicate-Type Binders on the Crushing Strength of Alumina Foams. In: Crystals, 2022, vol. 12 (10), article nº 139410.3390/cryst121013942073-4352info:eu-repo/semantics/openAccessreponame:Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos)instname:Agência para a Sociedade do Conhecimento (UMIC) - FCT - Sociedade da Informaçãoinstacron:RCAAP2022-12-04T04:45:16Zoai:repositorio.lneg.pt:10400.9/3968Portal AgregadorONGhttps://www.rcaap.pt/oai/openaireopendoar:71602024-03-19T16:15:26.832378Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos) - Agência para a Sociedade do Conhecimento (UMIC) - FCT - Sociedade da Informaçãofalse |
dc.title.none.fl_str_mv |
A New Insight into the Role of Silicate-Type Binders on the Crushing Strength of Alumina Foams |
title |
A New Insight into the Role of Silicate-Type Binders on the Crushing Strength of Alumina Foams |
spellingShingle |
A New Insight into the Role of Silicate-Type Binders on the Crushing Strength of Alumina Foams Oliveira, Fernando Almeida Costa Alumina Binders Mechanical properties |
title_short |
A New Insight into the Role of Silicate-Type Binders on the Crushing Strength of Alumina Foams |
title_full |
A New Insight into the Role of Silicate-Type Binders on the Crushing Strength of Alumina Foams |
title_fullStr |
A New Insight into the Role of Silicate-Type Binders on the Crushing Strength of Alumina Foams |
title_full_unstemmed |
A New Insight into the Role of Silicate-Type Binders on the Crushing Strength of Alumina Foams |
title_sort |
A New Insight into the Role of Silicate-Type Binders on the Crushing Strength of Alumina Foams |
author |
Oliveira, Fernando Almeida Costa |
author_facet |
Oliveira, Fernando Almeida Costa Pommier, Stéphane Fernandes, Jorge Cruz Dias, Diamantino |
author_role |
author |
author2 |
Pommier, Stéphane Fernandes, Jorge Cruz Dias, Diamantino |
author2_role |
author author author |
dc.contributor.none.fl_str_mv |
Repositório do LNEG |
dc.contributor.author.fl_str_mv |
Oliveira, Fernando Almeida Costa Pommier, Stéphane Fernandes, Jorge Cruz Dias, Diamantino |
dc.subject.por.fl_str_mv |
Alumina Binders Mechanical properties |
topic |
Alumina Binders Mechanical properties |
description |
ABSTRACT: Semi-closed cell macroporous alumina foams with relative densities ranging from 0.26 to 0.35 have been produced by the well-established replication method based on the coating of a polyurethane (PU) template foam by a ceramic slurry, followed by burnout of the PU template, and sintering of the ceramic skeleton. Collapse of the three-dimensional structure upon the volatilisation of the PU sponge can only be prevented using appropriate binders. Scarce data are available on the slurry formulations of commercial alumina foams. The aim of this study was to investigate the influence of silicate-type binders, namely kaolin and bentonite additives, on the crushing strength of alumina foams. The highest crushing strength of around 10 MPa was observed at a porosity of 66 +/- 2%. The open-cell model is inadequate to fit the crushing strength data of such semi-closed cell type structures. Both microscopic and macroscopic flaws resulting from the foam processing method contribute to the wide scatter of the strength, thereby explaining the Weibull modulus ranging from 4 to 7. Both flaw populations require further improvement to maximise the crushing strength of these foams with high potential for the design of structured catalyst carriers and molten aluminium filters. |
publishDate |
2022 |
dc.date.none.fl_str_mv |
2022-11-30T17:15:32Z 2022-10 2022-10-01T00:00:00Z |
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://hdl.handle.net/10400.9/3968 |
url |
http://hdl.handle.net/10400.9/3968 |
dc.language.iso.fl_str_mv |
eng |
language |
eng |
dc.relation.none.fl_str_mv |
Oliveira, Fernando de A. C... [et.al.] - A New Insight into the Role of Silicate-Type Binders on the Crushing Strength of Alumina Foams. In: Crystals, 2022, vol. 12 (10), article nº 1394 10.3390/cryst12101394 2073-4352 |
dc.rights.driver.fl_str_mv |
info:eu-repo/semantics/openAccess |
eu_rights_str_mv |
openAccess |
dc.format.none.fl_str_mv |
application/pdf |
dc.publisher.none.fl_str_mv |
MDPI |
publisher.none.fl_str_mv |
MDPI |
dc.source.none.fl_str_mv |
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Agência para a Sociedade do Conhecimento (UMIC) - FCT - Sociedade da Informação |
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RCAAP |
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RCAAP |
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Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos) |
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Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos) |
repository.name.fl_str_mv |
Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos) - Agência para a Sociedade do Conhecimento (UMIC) - FCT - Sociedade da Informação |
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1799130609634770944 |