Please use this identifier to cite or link to this item: http://repositorio.ufpa.br:8080/jspui/handle/2011/6094
Title: Ação sonoquímica e influência das condições de tratamento térmico na preparação de cimentos do sistema binário CaO-Al2O3
Other Titles: Sonochemical action and the influence of heat treatment conditions on the preparation of cements of the CaO-Al2O3 binary system
metadata.dc.creator: LOURENÇO, Rafaela Roberta
EXPOSITO, Caio Cesar Dente
ANGÉLICA, Rômulo Simões
RODRIGUES, José de Anchieta
Keywords: Síntese química
Sonoquímica
Cimento de aluminato de cálcio
Tratamento térmico
Issue Date: Mar-2010
Citation: LOURENCO, R. R et al. Ação sonoquímica e influência das condições de tratamento térmico na preparação de cimentos do sistema binário CaO-Al2O3. Cerâmica, São Paulo, v. 56, n. 337, p. 28-38, jan./mar. 2010. Disponível em: <http://www.scielo.br/pdf/ce/v56n337/v56n337a06.pdf>. Acesso em: 31 jul. 2014. <http://dx.doi.org/10.1590/S0366-69132010000100006>.
Abstract: Cements of the CaO-Al2O3, binary system were prepared through a sonochemical process at room temperature followed by heat treatment. The conventional production consists of a reaction in which a stoichiometric mixture of lime and bauxite or alumina is melted or sintered. High temperatures and energy consumption is an inconvenience associated to this type of synthesis. In the sonochemical process, the initial reagents, calcia and alumina, are put in an aqueous suspension under the action an ultrasonic bath during some time. After that, the material is heat treated, after the evaporation of water. Ultrasonic waves can induce changes in the surface morphology of the particles, including size reduction of them. Consequently, the reagent particles become more reactive and this facilitates the final synthesis of the calcium aluminates during the heat treatment. The action of ultrasonic waves and the influence of thermal treatment conditions were studied on two initials molar compositions calcia:alumina of 1:1 and 1:2. Temperatures of 1000, 1200 and 1300 ºC for 1 and 6 h were employed. SEM and X-ray diffraction were used to characterize the obtained materials and the phases were semi-quantified through Rietveld method. In addition, mechanical strength of the products was evaluated through splitting tensile tests. Pastes consisting of cement, alumina and water were prepared using the calcium aluminates prepared through the sonochemical process and commercial cement as reference.
URI: http://repositorio.ufpa.br/jspui/handle/2011/6094
ISSN: 0366-6913
Appears in Collections:Artigos Científicos - IG

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