INFLUENCE OF WATER-VAPOR AND ADDITIVES ON THE SURFACE-AREA STABILITY OF GAMMA-AL2O3

被引：38

作者：

PIJOLAT, M

DAUZAT, M

SOUSTELLE, M

机构：

[1] Départment de Chimie Physique des Processus Industriels, Ecole Nationale Supériure des Mines, 42023 Saint-Etienne Cedex

来源：

SOLID STATE IONICS | 1992年 / 50卷 / 1-2期

关键词：

D O I：

10.1016/0167-2738(92)90033-L

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

The influence of water vapour and additives on the decrease in surface area of gamma-Al2O3 at 1378 K, before its transformation into alpha-Al2O3, was investigated. The experimental rate of this decrease was found to vary as P(H2O)1/2 at constant value of surface area and for a value of water vapour pressure ranging from 0.1 to 1 kPa. This reduction in surface area was inhibited by a slight addition of Mg2+, Ca2+, La3+, Th4+ or Zr4+ ions but its rate was drastically increased by increasing both additive content up to 4% (cationic fraction) and oxygen pressure. The influence of water vapour can be explained quantitatively using a mechanistic model for initial sintering of oxide powders. This model is based on a description of material transport by means of structural elements of alumina, point defects, and their chemical interaction with the calcination atmosphere.

引用

页码：31 / 39

页数：9

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