Please use this identifier to cite or link to this item: doi:10.22028/D291-24156
Title: Preparação e caracterização de mulita pelo processo sol-gel
Other Titles: Characterization of mullite prepared by the sol-gel process
Author(s): Bozano, Dorotéia F.
Bonardi, C.
Ito, J. M.
Aegerter, Michel A.
Language: (Other)
Year of Publication: 1991
OPUS Source: Anais do XXXV Congresso Brasileiro de Cerâmica e III Iberoamericano de Cerámica, Vidrios y Refractarios : 26 a 29 de maio 1991, Belo Horizonte, MG. - São Paulo, Brasil : Associação Brasileira de Cerâmica, 1991, S. 273-281
SWD key words: Sol-Gel-Verfahren
DDC notations: 500 Science
Publikation type: Conference Paper
Abstract: -
We present a new sol-gel method to prepare gels of mullite (3Al2O3∙2SiO2) using as precursors a mixture of Si and Al alkoxides and a slow hydrolysis process. The gels have a polymeric structure with a high chemical homogeneity and crystallize at low temperature (980°C). X ray diffraction data indicate, at this temperature, the presence of a mixture of mullite and Al-Si spinel phases. The Al-Si spinel phase disappears at 1180°C and pure, well organized orthorhombic mullite is obtained at 1450°C. Ceramics prepared under uniaxial or isostatic pressing and sintered at 1550°C present, however, poor mechanical properties with apparent densities of the order of 70 to 80% of the theoretical density (3.17 g cm(-2)).
Link to this record: urn:nbn:de:bsz:291-scidok-23101
Date of registration: 24-Aug-2009
Faculty: SE - Sonstige Einrichtungen
Department: SE - INM Leibniz-Institut für Neue Materialien
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