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Thermo-Chemical Synthesis of Nanostructured Chromium Silicide / Silicon Carbide and Molybdenum Silicide / Silicon Carbide Composite 'Powders

Published online by Cambridge University Press:  25 February 2011

Ping Luo ,
Peter R. Strutt  and
Kenneth E. Gonsalves
Ping Luo
Affiliation:
Connecticut Advanced Technology Center for Precision Manufacturing and Department of Metallurgy, University of Connecticut, Storrs, CT 06269
Kenneth E. Gonsalves
Affiliation:
Institute of Materials Science, Polymer Program, University of Connecticut, CT 06269
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Abstract

Intermetallic silicides and silicon carbide composites are potential useful materials in high temperature applications requiring superior strength combined with enhanced fracture toughness. This paper presents results obtained on these materials in nanostructured form, since structural reduction to this scale offers a way for achieving unique properties.

Chromium silicide / silicon carbide and molybdenum silicide / silicon carbide composite powders were readily synthesized by thermal conversion from spray dried precomposites at 1250°C. Basically, the process involves spray drying the aqueous chemical solution to a precomposite, followed by thermal conversion in a tube furnace reactor. The phases present in the composites are hexagonal Cr5−XSi3−XCX+Y (Cr5Si3Cx) / cubic β-SiC and tetragonal MoSi2, hexagonal Mo5Si3CXx/ cubic β-SiC. The volume fraction of these phases can be controlled through the solution preparation of the precursors. Characterization of composite powders include x-ray diffraction spectrometry (XRD), scanning electron microscopy (SEM) and transmission electron microscopy (TEM). Particle size distribution of the synthesized chromium silicide and silicon carbide composite was conducted by a computerized image analyzer and the statistical result was obtained.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 322: Symposium F – High-Temperature Silicides and Refractory Alloys , 1993 , 149
Copyright
Copyright © Materials Research Society 1994

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