Enhancing effect of Cl-2 atmosphere on transition aluminas transformation

被引：18

作者：

Lopasso, EM

Gamboa, JJA

Astigueta, JM

Pasquevich, DM

机构：

[1] Centro Atómico Bariloche, Comn. Nac. de Ener. Atómica, (8400) S.C. de Bariloche, Rio Negro

来源：

JOURNAL OF MATERIALS SCIENCE | 1997年 / 32卷 / 12期

关键词：

D O I：

10.1023/A:1018687725900

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

In the present study we examine the changes in phase composition and microstructure undergone by solids after thermal treatments performed on transition aluminas in chlorine and air atmospheres. The thermal transformation to the stable alpha-Al2O3 was faster for the chlorine-heated samples than for the air-heated ones, and for chlorinated samples single crystals of alpha-Al2O3 were observed. We propose a mechanism by which AlCl3(g) formation allowed vapour mass transport that contributed to the growth of crystals of alpha-Al2O3. Hydroxyls contained in transition aluminas could enhance gaseous transport and could also react with chlorine molecules. The subsequent alpha-Al2O3 crystallization would be assisted by water vapour.

引用

页码：3299 / 3304

页数：6

共 25 条

[1]

BEAUCHAMP EK, 1992, J AM CERAM SOC, V73, P49

[2]

Berry L.G., 1959, MINERALOGY CONCEPTS

[3] INFLUENCE OF SURFACE-AREA AND ADDITIVES ON THE THERMAL-STABILITY OF TRANSITION ALUMINA CATALYST SUPPORTS .2. KINETIC-MODEL AND INTERPRETATION [J].