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Growth of SiC whiskers by VLS process

Published online by Cambridge University Press:  03 March 2011

G. Urretavizcaya  and
Porto J.M. López
G. Urretavizcaya
Affiliation:
Instituto de Investigationes en Ciencia y Tecnología de Materiales (INTEMA), (CONICET-Universidad Nacional de Mar del Plata), Av. J.B. Justo 4302-(7600) Mar del Plata, Argentina
Porto J.M. López
Affiliation:
Instituto de Investigationes en Ciencia y Tecnología de Materiales (INTEMA), (CONICET-Universidad Nacional de Mar del Plata), Av. J.B. Justo 4302-(7600) Mar del Plata, Argentina
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Abstract

β-SiC whiskers were synthesized by the vapor-liquid-solid (VLS) process using Fe catalyst. Whiskers show smooth surfaces and no ramifications. They have uniform diameter (0.5-1 μm) and lengths between 50 and 300 μm. A catalyst droplet was observed on the tip of almost all the whiskers. The transport of iron from the substrate surface to the SiO generators, where growth took place, occurs fundamentally via vapor phase. Fe was deposited over surfaces containing C, and whisker growth was produced where there were Fe droplets of appropriate size and SiO available in great quantity. The need for reaching a threshold size (2–3 μm) of the catalyst droplet before whisker growth is proposed as a possible explanation for the formation of whiskers with uniform size in zones with a high partial pressure of SiO.

Type
Articles
Information
Journal of Materials Research , Volume 9 , Issue 11 , November 1994 , pp. 2981 - 2986
Copyright
Copyright © Materials Research Society 1994

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References

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