ISSN 2594-5327
49º Congresso anual — Vol. 49, Num. 1 (1994)
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Resumo
The aluminum oxide has various polymorphs but only the α-phase is thermodynamically stable. The experimental conditions under which the aluminum oxide is obtained determine the resulting crystalline phase. This is an expected consequence of the nature of the metastable phases, which are always obtained as a function of the sequence of the treatment of synthesis. Variables such as thermal treatment, impurities, crystallite size, synthesis atmosphere, etc., have an important effect on the temperature at which α-alumina is achieved. In previous studies it was observed that heating of metastable phases of both zirconium and titanium oxides under chlorine atmospheres helps to obtain the respective stable phases. Based on the analogy between these systems and the aluminum oxide we presented in this paper a study of the sequence of transformation of transition aluminas when aluminum is heated in chlorine atmosphere. In this work we study the microstructural changes which occur during heating in chlorine atmosphere using techniques such as XRD, SEM, DTA and TG.
Palavras-chave
Aluminum oxide, Transition aluminas, Chlorine atmosphere, Phase transformation, Thermal treatment
Como citar
Lopasso, Edmundo M.; Astigueta, José; Gamboa, Julio J. Andrade; Pasquevich, Daniel M..
PHASE TRANSFORMATION STUDY OF TRANSITION ALUMINAS IN CHLORINE ATMOSPHERE,
p. 4430-4439.
In: 49º Congresso anual,
Rio de Janeiro, Brasil,
1994.
ISSN: 2594-5327, DOI 10.5151/2594-5327-49v9-341-350
