Microstructure and mechanical properties of SiC-nanowire-augmented tungsten composites

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The effect of an addition of SiC nanowire on the microstructure and mechanical properties of tungsten-based composites is investigated in this study. SiC-nanowire-augmented tungsten composites were prepared by a spray-drying process and an in situ spark plasma sintering process. Three distinctive reaction phases, tungsten, tungsten carbide (W(2)C) and rod-type tungsten silicide (W(5)Si(3)) were formed during the sintering process. The flexural strength was significantly increased from 706 MPa to 924 MPa in tungsten composites augmented with SiC nanowires, as was the formation of W(2)C and W(5)Si(3) phases. The rod-type W(5)Si(3) bears significant stress by both sharing a portion of the load and providing a bridging mechanism. Furthermore, a high ablation resistance at an elevated temperature was observed for tungsten composites augmented with SiC nanowires. (C) 2011 Elsevier B. V. All rights reserved.
Publisher
ELSEVIER SCIENCE SA
Issue Date
2011-09
Language
English
Article Type
Article
Keywords

METAL-MATRIX COMPOSITES; INTERFACIAL REACTIONS; SILICON-CARBIDE; SPARK PLASMA

Citation

JOURNAL OF ALLOYS AND COMPOUNDS, v.509, no.37, pp.9060 - 9064

ISSN
0925-8388
URI
http://hdl.handle.net/10203/99691
Appears in Collection
NE-Journal Papers(저널논문)MS-Journal Papers(저널논문)
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