HIGH-TEMPERATURE STABILITY OF MONAZITE-ALUMINA COMPOSITES

被引：98

作者：

MORGAN, PED

MARSHALL, DB

HOUSLEY, RM

机构：

[1] Rockwell Science Center, Thousand Oaks, CA 91360

来源：

MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING | 1995年 / 195卷 / 1-2期

关键词：

MONAZITE; ALUMINUM OXIDE; CERAMIC MATRIX COMPOSITES;

D O I：

10.1016/0921-5093(94)06521-7

中图分类号：

TB3 [工程材料学];

学科分类号：

0805 ; 080502 ;

摘要：

The chemical and morphological stability and debonding characteristics of monazite/alumina interfaces were examined at temperatures of 1400 and 1600 degrees C. In the absence of impurities, the interface was found to be stable for long periods (24 h) at 1600 degrees C and to retain its ability to prevent crack growth by debonding. However, in the presence of alkali metal or divalent elements (K, Mg, Ca and others) at a free surface, La-containing beta-alumina-magnetoplumbite platelets form near the interface. It is proposed that these elements stabilize the beta-alumina-magnetoplumbite structure by tending to form the more stable 'stuffed' structure closer to the magnetoplumbite type.

引用

页码：215 / 222

页数：8

共 7 条

[1] SYNTHESIS AND CHARACTERIZATION OF SOL-GEL DERIVED LANTHANUM HEXALUMINATE POWDERS AND FILMS [J].