DENSE POLYCRYSTALLINE CALCIUM BETA-''-ALUMINAS AND BETA-ALUMINAS - SYNTHESIS, XRD CHARACTERIZATION AND THERMAL-STABILITY

被引：15

作者：

KIRCHNEROVA, J ^{[1
]}

PETRIC, A ^{[1
]}

BALE, CW ^{[1
]}

PELTON, AD ^{[1
]}

机构：

[1] MCMASTER UNIV,DEPT MAT SCI & ENGN,HAMILTON L8S 4L7,ONTARIO,CANADA

来源：

MATERIALS RESEARCH BULLETIN | 1991年 / 26卷 / 06期

关键词：

CALCIUM; BETA-ALUMINAS;

D O I：

10.1016/0025-5408(91)90193-P

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

Techniques for preparing dense polycrystalline Ca beta"-alumina ceramic shapes by ion exchange of sintered Li2 O-stabilized Na beta"-alumina containing between 5 and 19% of a beta-phase have been examined. Preparation of Ca beta-alumina by ion exchange has also been investigated. Nearly full exchange of both phases has been achieved in all cases. Both Ca beta"- and beta-alumina were found to be thermally unstable, transforming above 700-degrees-C progressively to a magnetoplumbite phase. X-ray powder diffraction patterns for Ca beta"-alumina and for Ca beta-alumina are presented. Direct synthesis by solid-state high temperature reactions leads only to the formation of the magnetoplumbite phase, regardless of the precursor materials.

引用

页码：527 / 534

页数：8

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