CONVERSION OF RAW RICE HUSKS TO SIC BY PYROLYSIS IN NITROGEN ATMOSPHERE

Citation
Rv. Krishnarao et al., CONVERSION OF RAW RICE HUSKS TO SIC BY PYROLYSIS IN NITROGEN ATMOSPHERE, Journal of the European Ceramic Society, 18(2), 1998, pp. 147-152
Citations number
31
Categorie Soggetti
Material Science, Ceramics
ISSN journal
09552219
Volume
18
Issue
2
Year of publication
1998
Pages
147 - 152
Database
ISI
SICI code
0955-2219(1998)18:2<147:CORRHT>2.0.ZU;2-F
Abstract
Raw rice husks without precoking were directly pyrolysed in a graphite resistance heating furnace at 1100-1400 degrees C in nitrogen atmosph ere. The furnace chamber pressure was varied from atmospheric pressure (14.7 Psi or 101.3 KPa) to 24 Psi (165 KPa). Considerable quantities of SiC whiskers were formed at 1200-1400 degrees C. Small quantities o f Si2N2O were also formed at 1100 and 1200 degrees C. No Si3N4 was for med. The increase in chamber pressure has resulted in (i) an increase in the crystallization of silica and carbon in rice husks, (ii) decrea se in the formation of SiC whiskers. Pyrolysis in nitrogen atmosphere resulted in the formation of good quality (needle type) SiC whiskers. (C) 1997 Elsevier Science Limited.