A New Insight into the Role of Silicate-Type Binders on the Crushing Strength of Alumina Foams

Detalhes bibliográficos
Autor(a) principal: Oliveira, Fernando Almeida Costa
Data de Publicação: 2022
Outros Autores: Pommier, Stéphane, Fernandes, Jorge Cruz, Dias, Diamantino
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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spelling 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
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