Optimal strength and toughness of Al2O3-ZrO2 laminates designed with external or internal compressive layers

被引：81
作者：
Bermejo, Raul [1 ]
Pascual, Javier [1 ]
Lube, Tanja [1 ]
Danzer, Robert [1 ]
机构：
[1] Univ Leoben, Inst Struktur & Funktionskeramik, A-8700 Leoben, Austria
来源：
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY | 2008年 / 28卷 / 08期
关键词：
composites; toughness and toughening; strength; Al2O3-ZrO2; weight function;
D O I：
10.1016/j.jeurceramsoc.2007.11.003
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：
Layered ceramics have been proposed as an alternative choice for the design Of Structural ceramics with improved fracture toughness, strength and reliability. The use of residual compressive stresses, either at the surface or in the internal layers, may improve the strength as well as the crack resistance of the material during crack growth. In this work, two alumina-zirconia laminates designed with external (ECS-laminates) and internal (ICS-laminates) compressive stresses have been investigated using a fracture mechanics weight function analysis. An optimal architecture that maximises material toughness and strength has been found for each design as a function of geometry. From a flaw tolerant viewpoint, ECS-laminates are suitable for ceramic components with small cracks or flaws which are embedded in or near the potential tensile surface of the piece. On the other hand, the existence of large cracks or defects suggests the use of ICS-laminates to attain a more reliable response. (c) 2007 Elsevier Ltd. All rights reserved.
引用
收藏
页码：1575 / 1583
页数：9
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