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The Effect of Excess Carbon on the Crystallographic, Microstructural, and Mechanical Properties of CVD Silicon Carbide Fibers

Published online by Cambridge University Press:  01 February 2011

James V Marzik ,
William J. Croft ,
Richard J. Staples  and
Warren J. MoberlyChan
James V Marzik
Affiliation:
jmarzik@specmaterials.com, Specialty Materials, Inc., R&D, 1449 MIDDLESEX ST, LOWELL, MA, 01851, United States, 978-322-1961
William J. Croft
Affiliation:
wjcroft@fas.harvard.edu, Harvard University, Cambridge, MA, 02138, United States
Richard J. Staples
Affiliation:
staples@chemistry.harvard.edu, Harvard University, Cambridge, MA, 02138, United States
Warren J. MoberlyChan
Affiliation:
jmarzik@specmaterials.com, Lawrence Livermore National Laboratory, Livermore, CA, 94550, United States
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Abstract

Silicon carbide (SiC) fibers made by chemical vapor deposition (CVD) are of interest for organic, ceramic, and metal matrix composite materials due their high strength, high elastic modulus, and retention of mechanical properties at elevated processing and operating temperatures. The properties of SCS-6™ silicon carbide fibers, which are made by a commercial process and consist largely of stoichiometric SiC, were compared with an experimental carbon-rich CVD SiC fiber, to which excess carbon was added during the CVD process. The concentration, homogeneity, and distribution of carbon were measured using energy dispersive x-ray spectroscopy (SEM/EDS). The effect of excess carbon on the tensile strength, elastic modulus, and the crystallographic and microstructural properties of CVD silicon carbide fibers was investigated using tensile testing, x-ray diffraction, scanning electron microscopy (SEM), and transmission electron microscopy (TEM).

Keywords

chemical vapor deposition (CVD) (deposition)crystallographic structuremicrostructure
Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 982: Symposium KK – Electron Microscopy Across Hard and Soft Materials , 2006 , 0982-KK07-16
Copyright
Copyright © Materials Research Society 2007

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References

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