Synergy and competition in nano- and micro-design of structural ceramics

被引：15

作者：

Bellosi, A ^{[1
]}

Sciti, D ^{[1
]}

Guicciardi, S ^{[1
]}

机构：

[1] ISTEC, CNR, I-48018 Faenza, Italy

来源：

JOURNAL OF THE EUROPEAN CERAMIC SOCIETY | 2004年 / 24卷 / 12期

关键词：

Al2O3-SiC; mechanical properties; microstructure-final; nanocomposites; SiC;

D O I：

10.1016/j.jeurceramsoc.2003.10.014

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：

Nanosized structural ceramics SiC and Al2O3-SiC composites were produced and Studied in order to define relationships among microstructures (in the micro- and nano-size range) and mechanical properties. In both the systems, no evident improvement in strength and toughness was associated to nano-structures in comparison to micro-structures. However, nano-indentation tests on liquid-phase sintered SiC reveal peculiar and distinctive properties of nanostructured ceramics that imply unexpected repercussions for application performances involving the contact between two materials. Al2O3-SiC nano-composites have lower friction coefficient and higher wear resistance than the pure alumina. The advantages of nano-ceramics are attributed either to the higher grain boundary strength, as in the case of the nano-composites or to surface-dependent deformation mechanisms, like grain boundary sliding, in nanosized monolithic ceramics. (C) 2003 Elsevier Ltd. All rights reserved.

引用

页码：3295 / 3302

页数：8

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