Microstructural development in porous beta-Sisub(3)Nsub(4) ceramics prepared with low volume REsub(2Osub(3)-MgO-(CaO) additions (RE=La,Nd,Y,Yb)

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dc.contributor.authorPLUCKNETT, KEVIN P.pt_BR
dc.contributor.authorQUINLAN, MERVINpt_BR
dc.contributor.authorGARRIDO, LILIANApt_BR
dc.contributor.authorGENOVA, LUISpt_BR
dc.coverageInternacionalpt_BR
dc.date.accessioned2014-07-15T13:43:50Zpt_BR
dc.date.accessioned2014-07-30T11:49:10Z
dc.date.available2014-07-15T13:43:50Zpt_BR
dc.date.available2014-07-30T11:49:10Z
dc.date.issued2008pt_BR
dc.description.abstractPorous β-Si3N4 ceramics have a wide range of potential applications, including filters for hot gases or molten metals, bioreactor supports and lightweight structural components. In the present study, a new approach is taken for the production of porous β-Si3N4 ceramics based on compositional design. A low volume fraction of multiple sintering aids is employed, where each additive is designed to play one or more specific roles in the sintering behavior and microstructural development of β-Si3N4 (e.g. densification, α- to β-Si3N4 transformation, anisotropic β-Si3N4 whisker growth, debonding aid). The primary aim of this work was to develop β-Si3N4 ceramics with a more porous microstructure than in prior work (ideally with 20–40 vol.% porosity), while developing high grain aspect ratios (i.e. >10:1) such that good mechanical performance can be expected. Compositions are based on various ratios of RE2O3:MgO, where RE = La, Nd, Y or Yb, with selected materials also prepared with small CaO additions. Sintering has been conducted in a nitrogen atmosphere (0.1 MPa), at temperatures between 1400 and 1700 °C. The influence of sintering aid composition and sintering temperature has been assessed. Particular attention was paid to microstructure development, including: densification behavior, retained pore size, the extent of α- to β-Si3N4 transformation, and the evolution of β-Si3N4 grain aspect ratios.
dc.format.extent337-350pt_BR
dc.identifier.citationPLUCKNETT, KEVIN P.; QUINLAN, MERVIN; GARRIDO, LILIANA; GENOVA, LUIS. Microstructural development in porous beta-Sisub(3)Nsub(4) ceramics prepared with low volume REsub(2Osub(3)-MgO-(CaO) additions (RE=La,Nd,Y,Yb). <b>Materials Science and Engineering, A</b>, v. 489, p. 337-350, 2008. DOI: <a href="https://dx.doi.org/10.1016/j.msea.2007.12.023">10.1016/j.msea.2007.12.023</a>. Disponível em: http://repositorio.ipen.br/handle/123456789/5069.
dc.identifier.doi10.1016/j.msea.2007.12.023
dc.identifier.issn0921-5093pt_BR
dc.identifier.orcidhttps://orcid.org/0000-0002-5172-5082
dc.identifier.urihttp://repositorio.ipen.br/handle/123456789/5069pt_BR
dc.identifier.vol489pt_BR
dc.relation.ispartofMaterials Science and Engineering, Apt_BR
dc.rightsopenAccessen
dc.subjectceramicspt_BR
dc.subjectporous materialspt_BR
dc.subjectsilicon nitridespt_BR
dc.subjectsilicon oxidespt_BR
dc.subjectgrain growthpt_BR
dc.subjectscanning electron microscopypt_BR
dc.titleMicrostructural development in porous beta-Sisub(3)Nsub(4) ceramics prepared with low volume REsub(2Osub(3)-MgO-(CaO) additions (RE=La,Nd,Y,Yb)pt_BR
dc.typeArtigo de periódicopt_BR
dspace.entity.typePublication
ipen.autorLUIS ANTONIO GENOVA
ipen.codigoautor320
ipen.contributor.ipenauthorLUIS ANTONIO GENOVA
ipen.date.recebimento09-02pt_BR
ipen.identifier.fi1.806pt_BR
ipen.identifier.ipendoc13125pt_BR
ipen.identifier.iwosWoSpt_BR
ipen.range.fi1.500 - 2.999
ipen.type.genreArtigo
relation.isAuthorOfPublicatione7af24e8-0db9-49d2-8caf-92fd57c2686b
relation.isAuthorOfPublication.latestForDiscoverye7af24e8-0db9-49d2-8caf-92fd57c2686b
sigepi.autor.atividadeGENOVA, LUIS:320:720:Npt_BR
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