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Synthesis of nanophase silicon, carbon, and silicon carbide powders using a plasma expansion process

Published online by Cambridge University Press:  03 March 2011

N. Rao ,
B. Micheel ,
D. Hansen ,
C. Fandrey ,
M. Bench ,
S. Girshiek ,
J. Heberlein  and
P. McMurry
N. Rao
Affiliation:
University of Minnesota, Minneapolis, Minnesota 55455
B. Micheel*
Affiliation:
University of Minnesota, Minneapolis, Minnesota 55455
D. Hansen
Affiliation:
University of Minnesota, Minneapolis, Minnesota 55455
C. Fandrey
Affiliation:
University of Minnesota, Minneapolis, Minnesota 55455
M. Bench
Affiliation:
University of Minnesota, Minneapolis, Minnesota 55455
S. Girshiek
Affiliation:
University of Minnesota, Minneapolis, Minnesota 55455
J. Heberlein
Affiliation:
University of Minnesota, Minneapolis, Minnesota 55455
P. McMurry
Affiliation:
University of Minnesota, Minneapolis, Minnesota 55455
*
a)Currently at Trinity Consultants, Inc., Overland Park, Kansas 66210.
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Abstract

Nanophase powders of Si, C, and SiC with narrow size distributions are synthesized by dissociating reactants in a dc are plasma and quenching the hot gases in a subsonic nozzle expansion. The plasma is characterized by calorimetric energy balances and the powders by on-line aerosol measurcment techniques and conventional materials analysis. The measured nozzle quench rate is about 5 × 106 K/s. The generated particles have number mean diameters of about 10 nm or less, with Si forming relatively dense, coalesced particles, while SiC forms highly aggregated particles. Our data suggest that SiC particle formation is initiated by the nucleation of small silicon particles.

Type
Articles
Information
Journal of Materials Research , Volume 10 , Issue 8 , August 1995 , pp. 2073 - 2084
Copyright
Copyright © Materials Research Society 1995

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