PORE MORPHOLOGY IN CRYOCHEMICALLY PREPARED ALUMINA POWDERS AND THEIR SULFATE PRECURSORS

被引：8

作者：

LLOYD, IK

KOVEL, RJ

机构：

[1] Univ of Pittsburgh, Pittsburgh, PA,, USA, Univ of Pittsburgh, Pittsburgh, PA, USA

来源：

JOURNAL OF MATERIALS SCIENCE | 1988年 / 23卷 / 01期

关键词：

ALUMINUM COMPOUNDS - Chemical Reactions - CERAMIC MATERIALS - Porosity - CHEMICAL REACTIONS - Low Temperature Effects - CRYOGENICS - POROUS MATERIALS - Microscopic Examination;

D O I：

10.1007/BF01174051

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

Cryochemically prepared alumina and yttria-doped alumina powders and their sulphate precursors were examined in the SEM and TEM. The TEM examination revealed a typical chained agglomerate structure with subnanometre-size porosity within the agglomerates and micrometre-sized porosity between the agglomerates. The SEM examination showed that the sulphate solutions had separated into water channels and immiscible hydrates upon freezing. The water channels had ovulated and spheroidized as they were freezing. This morphology was maintained through vacuum drying and calcining.

引用

页码：185 / 188

页数：4