Self-reinforced Ca-hexaluminate/alumina composites with graded microstructures

被引：51
|
作者：
Asmi, D. [1 ]
Low, I. M. [2 ]
机构：
[1] Lampung Univ JL S Brojonegoro, Fac Math & Nat Sci, Dept Phys, Lampung 35145, Indonesia
[2] Curtin Univ Technol, Dept Appl Phys, Mat Res Grp, Perth, WA, Australia
来源：
CERAMICS INTERNATIONAL | 2008年 / 34卷 / 02期
关键词：
composites; platelets; fracture; mechanical properties; Al2O3;
D O I：
10.1016/j.ceramint.2006.10.001
中图分类号：
TQ174 [陶瓷工业]; TB3 [工程材料学];
学科分类号：
0805 ; 080502 ;
摘要：
The physical, thermal, and mechanical characteristics of self-reinforced calcium-hexaluminate/alumina composites with a graded microstructure are described. The presence of CA(6) phase in Al2O3 matrix has a significant effect on the physical, thermal, and mechanical properties of graded Al2O3-CA(6) composites. The slightly lower shrinkage and density in the graded composite can be attributed to the presence of CA6 phase. The thermal expansion and densification behaviour of the graded composite showed that the presence of CA6 phase hinders the processes of sintering and densification of alumina matrix. When compared to the alumina region, the graded CA(6)-Al2O3 region is softer by virtue of the presence of the softer CA(6) phase. However, the fracture toughness in the graded region is higher than the alumina region which can be attributed to the display of crack deflection and crack-bridging provided by the CA(6) platelets. Crown Copyright (c) 2006 Published by Elsevier Ltd and Techna Group S.r.l. All rights reserved.
引用
收藏
页码：311 / 316
页数：6
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