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Novel Rf-Plasma System for the Synthesis of Ultrafine, Ultrapure Sic and Si3N4

Published online by Cambridge University Press:  15 February 2011

Gerald J. Vogt ,
Charles M. Hollabaugh ,
Donald E. Hull ,
Lawrence R. Newkirk  and
John J. Petrovic
Gerald J. Vogt
Affiliation:
Materials Science and Technology Division, Los Alamos National Laboratory, Los Alamos, New Mexico 87545
Charles M. Hollabaugh
Affiliation:
Materials Science and Technology Division, Los Alamos National Laboratory, Los Alamos, New Mexico 87545
Donald E. Hull
Affiliation:
Materials Science and Technology Division, Los Alamos National Laboratory, Los Alamos, New Mexico 87545
Lawrence R. Newkirk
Affiliation:
Materials Science and Technology Division, Los Alamos National Laboratory, Los Alamos, New Mexico 87545
John J. Petrovic
Affiliation:
Materials Science and Technology Division, Los Alamos National Laboratory, Los Alamos, New Mexico 87545
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Abstract

A novel high-temperature plasma tube has been developed that overcomes the meltdown problem of the conventional water- and gas-cooled quartz plasma tubes commonly used. The key feature of this system is the placement of heavywalled, water-cooled copper fingers inside a quartz mantle to shield the mantle from the intense radiation of the plasma. The copper fingers act as transformers to couple the plasma to the applied rf field.

This system has been used to produce ultrafine, ultrapure silicon carbide powder by reaction of silane and methane. Powder of β-SiC has been obtained with a BET surface area of >160 m2 /g and a particle size range of 10 to 20 nm as measured by TEM. Likewise, powder of silicon nitride has been synthesized by reaction of silane and ammonia in the plasma. The resulting powder is approximately 50% Si3N4 with a mixture of α- and β-polymorphic forms. Boron carbide has also been successfully synthesized from diborane and methane.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 30: Symposium L – Plasma Processing and Synthesis of Materials I , 1983 , 283
Copyright
Copyright © Materials Research Society 1984

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References

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