alpha-SiAlON ceramics with elongated grain morphology using an alternative sintering additive

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dc.contributor.authorSantos, C.
dc.contributor.authorStrecker, K.
dc.contributor.authorRibeiro, S.
dc.contributor.authorde Souza, JVC
dc.contributor.authorSilva, OMM
dc.contributor.authorda Silva, CRM
dc.contributor.institutionUniversidade de São Paulo (USP)
dc.contributor.institutionCtr Tecn Aeroesp
dc.contributor.institutionUniversidade Estadual Paulista (Unesp)
dc.date.accessioned2014-05-20T15:29:48Z
dc.date.available2014-05-20T15:29:48Z
dc.date.issued2004-04-01
dc.description.abstractIn this work, the use of a natural yttrium oxide and rare earth oxide solid solution (CRE2O3) as stabilizers of the alpha-Si3N4 phase to form alpha-SiAlON has been investigated. This oxide mix is produced at FAENQUIL-DEMAR, at a cost of only 20% of pure commercial Y2O3. Two alpha-SiAlONs using pure Y2O3 or CRE2O3 have been prepared, using mixes of 20% by volume of a molar fraction of 9:1 of AlN to Y2O3 or AlN to CRE2O3, respectively, with 80% alpha-Si3N4. Samples were gas pressure-sintered at 1900 degreesC, under 1.5 MPa of N-2 for 60 min. Both compositions yielded alpha-SiAlON ceramics with high relative densities (98% t.d.), hardness of 18 GPa and fracture toughness of 5 Mpa m(1/2), with homogeneous microstructures composed of elongated alpha-SiAlON grains with aspect ratios of 5. It is concluded that the mixed rare earth concentrate (CRE2O3) can be used to produce alpha-SiAlON ceramics with similar microstructures and mechanical properties of alpha-SiAlON ceramics fabricated using pure Y2O3, but with the advantage of its lower production cost. (C) 2004 Elsevier B.V All rights reserved.en
dc.description.affiliationFAENQUIL, DEMAR, Dept Mat Engn, BR-12600000 Lorena, SP, Brazil
dc.description.affiliationCtr Tecn Aeroesp, Div Mat, AMR, CTA, BR-12228904 Sao Jose Dos Campos, SP, Brazil
dc.description.affiliationUNESP, FEG, BR-12516410 Guaratingueta, SP, Brazil
dc.description.affiliationUnespUNESP, FEG, BR-12516410 Guaratingueta, SP, Brazil
dc.format.extent1792-1796
dc.identifierhttp://dx.doi.org/10.1016/j.matlet.2003.10.054
dc.identifier.citationMaterials Letters. Amsterdam: Elsevier B.V., v. 58, n. 11, p. 1792-1796, 2004.
dc.identifier.doi10.1016/j.matlet.2003.10.054
dc.identifier.issn0167-577X
dc.identifier.urihttp://hdl.handle.net/11449/39300
dc.identifier.wosWOS:000220244900028
dc.language.isoeng
dc.publisherElsevier B.V.
dc.relation.ispartofMaterials Letters
dc.relation.ispartofjcr2.687
dc.rights.accessRightsAcesso restrito
dc.sourceWeb of Science
dc.subjectsintering additivept
dc.subjectalpha-SiAlONpt
dc.subjectmicrostructurept
dc.subjectmechanical propertiespt
dc.titlealpha-SiAlON ceramics with elongated grain morphology using an alternative sintering additiveen
dc.typeArtigo
dcterms.licensehttp://www.elsevier.com/about/open-access/open-access-policies/article-posting-policy
dcterms.rightsHolderElsevier B.V.
unesp.author.orcid0000-0001-6301-6446[6]
unesp.author.orcid0000-0001-9700-0901[4]
unesp.author.orcid0000-0002-0741-739X[3]

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