Mechanical and thermal behaviour of cordierite-zirconia composites

被引:70
作者
Oliveira, FAC
Fernandes, JC
机构
[1] Inst Nacl Engn & Tecnol Ind, Dept Mat & Tecnol Prod, P-1649038 Lisbon, Portugal
[2] Univ Tecn Lisboa, Dept Mat Engn, Inst Super Tecn, P-1049001 Lisbon, Portugal
关键词
cordierite; zirconia; ceramic matrix composites; flexural strength; thermal expansion coefficient;
D O I
10.1016/S0272-8842(01)00061-X
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
Cordierite (Mg2Al4Si5O18) ceramics are susceptible of mechanical failure due to their low fracture toughness, which may hinder their application. Dispersion of ZrO2 in cordierite to improve the mechanical properties has been extensively studied. However, little is known about the effect of such additions on both the sinterability and the mechanical properties of cordierite bodies fabricated from tale, kaolin and alumina mixes with additions of monoclinic ZrO2, as most studies are concerned with additions of tetragonal ZrO2 to cordierite powders. The present paper describes the in situ fabrication, the thermal and mechanical properties of sintered cordierite-based ceramic matrix composites containing dispersed particles of ZrO2 obtained by mixing clay-talc-alumina mixtures with additions of monoclinic ZrO2 up to 40 wt.%. The results obtained clearly demonstrate that the thermal expansion coefficient (CTE), elastic moduli (E) and flexural strength (sigma(r)) were critically dependent on the mixing/milling conditions, the ZrO2 content and the retained porosity. (C) 2002 Elsevier Science Ltd and Techna S.r.l. All rights reserved.
引用
收藏
页码:79 / 91
页数:13
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