Nucleation and growth of mullite whiskers from lanthanum-doped aluminosilicate melts

dc.contributor.authorRegiani, I
dc.contributor.authorMagalhaes, WLE
dc.contributor.authorde Souza, DPF
dc.contributor.authorPaiva-Santos, C. O.
dc.contributor.authorde Souza, M. F.
dc.contributor.institutionUniversidade de São Paulo (USP)
dc.contributor.institutionUniversidade Federal de São Carlos (UFSCar)
dc.contributor.institutionUniversidade Estadual Paulista (Unesp)
dc.date.accessioned2014-05-20T15:28:06Z
dc.date.available2014-05-20T15:28:06Z
dc.date.issued2002-01-01
dc.description.abstractNucleation and growth of mullite whiskers in the La2O3-Al2O3-SiO2 system were investigated in the 1500degrees-1700degreesC temperature range. A differential thermal analysis (DTA) showed that the mullitization temperature decreases from 1350degreesC to 1240degreesC as a result of lanthania doping. In the temperature range of 1250-1500degreesC, most of the mullite grains have an Al2O3/SiO2 = 1.5 composition throughout the ceramic body; however, from 1400degreesC upward, the number of anisotropic grains with the Al2O3/SiO2 = 1.3 composition begins to increase. The concentration of alumina in the composition of the grain-boundary phase decreases as firing temperatures increase. At temperatures > 1500degreesC, alumina grains and whiskers grow on the internal and external surfaces of the ceramic body with the characteristic Al2O3/SiO2 = 1.3 composition. Removal of the mullite whisker layer by acid attack revealed an alumina-rich, rosace-like patterned microstructure correlated with the process of whisker nucleation and growth. In the early stages, whisker growth rates were found to be near 60 mum/h. Experimental evidence pointed to nucleation inside the thin glass layer on the external surface.en
dc.description.affiliationUniv São Paulo, Inst Phys, Dept Phys & Mat Sci, BR-13560970 Sao Carlos, SP, Brazil
dc.description.affiliationUniv Fed Sao Carlos, Dept Mat Engn, BR-13560 Sao Carlos, SP, Brazil
dc.description.affiliationSão Paulo State Univ, UNESP, Araraquara Inst Chem, São Paulo, Brazil
dc.description.affiliationUnespSão Paulo State Univ, UNESP, Araraquara Inst Chem, São Paulo, Brazil
dc.format.extent232-238
dc.identifierhttp://dx.doi.org/10.1111/j.1151-2916.2002.tb00071.x
dc.identifier.citationJournal of the American Ceramic Society. Westerville: Amer Ceramic Soc, v. 85, n. 1, p. 232-238, 2002.
dc.identifier.doi10.1111/j.1151-2916.2002.tb00071.x
dc.identifier.issn0002-7820
dc.identifier.urihttp://hdl.handle.net/11449/37984
dc.identifier.wosWOS:000173250800044
dc.language.isoeng
dc.publisherAmer Ceramic Soc
dc.relation.ispartofJournal of the American Ceramic Society
dc.relation.ispartofjcr2.956
dc.relation.ispartofsjr0,950
dc.rights.accessRightsAcesso restrito
dc.sourceWeb of Science
dc.titleNucleation and growth of mullite whiskers from lanthanum-doped aluminosilicate meltsen
dc.typeArtigo
dcterms.licensehttp://olabout.wiley.com/WileyCDA/Section/id-406071.html
dcterms.rightsHolderAmer Ceramic Soc
unesp.author.orcid0000-0002-1422-6399[4]
unesp.author.orcid0000-0003-4405-293X[2]

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