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

dc.contributorUniversidade Estadual Paulista (UNESP)
dc.creatorSantos, C.
dc.creatorStrecker, K.
dc.creatorRibeiro, S.
dc.creatorde Souza, JVC
dc.creatorSilva, OMM
dc.creatorda Silva, CRM
dc.date2014-05-20T15:29:48Z
dc.date2016-10-25T18:05:05Z
dc.date2014-05-20T15:29:48Z
dc.date2016-10-25T18:05:05Z
dc.date2004-04-01
dc.date.accessioned2017-04-06T00:13:37Z
dc.date.available2017-04-06T00:13:37Z
dc.identifierMaterials Letters. Amsterdam: Elsevier B.V., v. 58, n. 11, p. 1792-1796, 2004.
dc.identifier0167-577X
dc.identifierhttp://hdl.handle.net/11449/39300
dc.identifierhttp://acervodigital.unesp.br/handle/11449/39300
dc.identifier10.1016/j.matlet.2003.10.054
dc.identifierWOS:000220244900028
dc.identifierhttp://dx.doi.org/10.1016/j.matlet.2003.10.054
dc.identifier.urihttp://repositorioslatinoamericanos.uchile.cl/handle/2250/882223
dc.descriptionIn 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.
dc.languageeng
dc.publisherElsevier B.V.
dc.relationMaterials Letters
dc.rightsinfo:eu-repo/semantics/closedAccess
dc.subjectsintering additive
dc.subjectalpha-SiAlON
dc.subjectmicrostructure
dc.subjectmechanical properties
dc.titlealpha-SiAlON ceramics with elongated grain morphology using an alternative sintering additive
dc.typeOtro


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