Paper Title:
Obtaining of Mullite by Rapid Sintering from Bentonite Clay
  Abstract

Bentonite clays are aluminium–silicates that when heated turn into mullite. The sintering of mullite obtained from these mineral clays by quick microwaves heating comes up as an alternative process for mullite powders synthesis. The use of quick heating on ceramics nano-powders synthesis is a recent technology that is being successfully used on synthesis with microwaves and synthesis process by combustion. The quick microwaves heating enable adding heat quickly and equally, accelerating the nucleation kinetics and the development of the mullite stage. Thus, the purpose of this work is to analyze the effect of the microwaves heating process variables, analyzing the influence of the applied power and of the heating rate on the mullite powders obtaining from bentonite clays. The clays have been favored and submitted to the following characterizations: chemical granulometric and mineralogically. Subsequently, the clays have been delamined aiming disagglomeration and separation of the thinner fractions and submitted to granulometric and mineralogical characterization. The synthesis has been realized on a domestic microwaves oven. The obtained powders have been characterized by X-ray diffraction. The results showed that the applied power variation and the sintering time are fundamental on the obtaining of mullite powders.

  Info
Periodical
Materials Science Forum (Volumes 660-661)
Edited by
Lucio Salgado and Francisco Ambrozio Filho
Pages
936-942
DOI
10.4028/www.scientific.net/MSF.660-661.936
Citation
J. Gomes, A. I. O. Rocha, R. R. Menezes, G. A. Neves, M. I. Brasileiro, L. N. de Lima Santana, "Obtaining of Mullite by Rapid Sintering from Bentonite Clay", Materials Science Forum, Vols. 660-661, pp. 936-942, 2010
Online since
October 2010
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