The RF plasma synthesis of ultrafine, ultrapure silicon carbide powder
Abstract
Ultrafine, ultrapure silicon carbide powder has been produced by reaction of silane and methane in a high temperature RF plasma. Preliminary studies include the effect of gas composition and of powder (plasma temperature) on the stoichiometry of the powder. The carbon-to-silicon ratio of the powder was varied from 1.0 to 1.9 by changing the process conditions. The powder has a BET surface rea of 101 m(2)/g, which is equivalent to a particle diameter of 18.5 nm. A particle size in the range of 10 to 20 nm was measured by transmission electron microscopy. X-ray diffraction results indicate a domain size of 7.5 nm and a crystal structure of beta (cubic) silicon carbide. Spectrographic analysis shows that metallic impurities are lower than high quality grade commercial powder. Because of the high surface area, the powder must be stored and processed in an inert atmosphere to prevent severe contamination with oxygen.
- Publication:
-
Presented at the Intern. Conf. on Ultrastructure Processing of Ceramics
- Pub Date:
- 1983
- Bibcode:
- 1983upcg.conf.....H
- Keywords:
-
- Crystal Structure;
- Methane;
- Powder (Particles);
- Silanes;
- Silicon Carbides;
- Synthesis (Chemistry);
- Carbon Compounds;
- Ceramics;
- Composite Materials;
- Plasma Jet Synthesis;
- Silicon Compounds;
- Solid-State Physics