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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.identifier.citationJournal of the American Ceramic Society. Westerville: Amer Ceramic Soc, v. 85, n. 1, p. 232-238, 2002.-
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.publisherAmer Ceramic Soc-
dc.sourceWeb of Science-
dc.titleNucleation and growth of mullite whiskers from lanthanum-doped aluminosilicate meltsen
dc.contributor.institutionUniversidade de São Paulo (USP)-
dc.contributor.institutionUniversidade Federal de São Carlos (UFSCar)-
dc.contributor.institutionUniversidade Estadual Paulista (UNESP)-
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.rights.accessRightsAcesso restrito-
dc.relation.ispartofJournal of the American Ceramic Society-
Appears in Collections:Artigos, TCCs, Teses e Dissertações da Unesp

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