Synthesis and characterization of Nb5Si3/Nb functionally graded composites

被引：19
|
作者：
Heian, EM [1 ]
Gibeling, JC [1 ]
Munir, ZA [1 ]
机构：
[1] Univ Calif Davis, Dept Chem Engn & Mat Sci, Davis, CA 95616 USA
来源：
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING | 2004年 / 368卷 / 1-2期
基金：
美国国家科学基金会;
关键词：
ceramic matrix composites; functionally graded materials (FGM); transition metal silicides; spark plasma synthesis;
D O I：
10.1016/j.msea.2003.10.307
中图分类号：
TB3 [工程材料学];
学科分类号：
0805 ; 080502 ;
摘要：
Through simultaneous field-activated reaction and densification, two- and five-layer graded composites of Nb(5)Si(3) and Nb were formed. The product microstructure consisted of Nb particles in a matrix of Nb(5)Si(3) with the composition ranging from 3.4 to 55.8 vol.% Nb (20-90 mol% Nb) for the five-layer samples. The microhardness decreased with increasing vol.% Nb, from 1199 to 732 Hv over the indicated range. Fracture toughness measured by indentation increased from about 21 to 30 MPa m 1/2 over the composition range of 3.4-36.0 vol.% Nb. Crack blunting and bridging by Nb particles was observed around a microindentation. (C) 2003 Elsevier B.V. All rights reserved.
引用
收藏
页码：168 / 174
页数：7
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