| Autor: |
Gomes, Josileido, de Melo Cartaxo, Juliana, Menezes, Romualdo Rodrigues, de Araújo Neves, Gelmires, Brasileiro, Maria Isabel, de Lima Santana, Lisiane Navarro |
| Zdroj: |
Materials Science Forum; August 2012, Vol. 727 Issue: 1 p781-786, 6p |
| Abstrakt: |
A wide variety of synthesis methods have been proposed for obtaining mullite, however, some techniques produce powders with heterogeneous morphology and a large amount of glassy phase, forming large clusters making it difficult to obtain nanopowders. The microwave synthesis offers advantages over conventional methods, the heating is rapid and uniform, avoiding an undesirable grain growth. The aim of this work was the synthesis of nanoscale mullites powders from delaminated bentonites. For the process of delamination samples were initially treated, then rehydrated, frozen and deagglomeration in ball mill and subsequently subjected to centrifugation, in order to produce a nanosized precursor for the synthesis of mullite. The powders obtained after peeling were characterized chemical and mineralogical. The synthesis of mullite was performed in a microwave oven and the powders were characterized by XRD and SEM. The results showed that the delamination of the bentonite and microwave synthesis were essential in obtaining nanopowders mullite. |
| Databáze: |
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