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(Referência obtida automaticamente do Web of Science, por meio da informação sobre o financiamento pela FAPESP e o número do processo correspondente, incluída na publicação pelos autores.)

Evaluation of the porogenic behavior of aluminum hydroxide particles of different size distributions in castable high-alumina structures

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Autor(es):
Souza, Adriane D. V. [1] ; Salomao, Rafael [1]
Número total de Autores: 2
Afiliação do(s) autor(es):
[1] Univ Sao Paulo, Sao Carlos Sch Engn, Dept Mat Engn, Sao Carlos, SP - Brazil
Número total de Afiliações: 1
Tipo de documento: Artigo Científico
Fonte: Journal of the European Ceramic Society; v. 36, n. 3, p. 885-897, FEB 2016.
Citações Web of Science: 7
Resumo

The combination of Al2O3 and Al(OH)(3) produces high refractoriness porous structures. The evolution of these ceramics during the first heating is a competition between pore generation by Al(OH)(3) dehydroxilation, and densification by sintering. Previous studies have reported the size of Al(OH)(3) particles affect both events. In this study, we evaluate the porogenic behavior of three grades of ce-Al(OH)(3) (gibbsite) of different average particle sizes (0.9,10 and, 107 mu m). The particles were thermally treated (300-1500 degrees C) for the investigation of changes in their physical properties and microstructures. Amounts of 67.5 vol% of each grade were added to aqueous castable alumina suspensions. After rheological tests and casting, the sintered samples (1100-1500 degrees C) were tested for porosity, pore size, and strength and examined by electron microscopy. The particles of the three grades exhibited similar evolution during thermal treatment. When they were added to the alumina matrix, structures of different porosity and strength were obtained. (C) 2015 Elsevier Ltd. All rights reserved. (AU)

Processo FAPESP: 10/19274-5 - Nova rota de sínteses de hidrotalcita (Mg6Al2(OH)16CO3.4H2O) a partir de suspensões aquosas de óxido de magnésio (MgO) e hidróxido de alumínio (Al(OH)3) e sua utilização em cerâmicas porosas para isolamento térmico em alta temperatura
Beneficiário:Rafael Salomão
Linha de fomento: Auxílio à Pesquisa - Apoio a Jovens Pesquisadores