Open AccessSynthesis of High Purity- Sicand- Si 3N4Fromricehulls
Author(s) -
B. Treviño,
Iván Gómez,
Rafael Colás
Publication year - 2011
Publication title -
química hoy chemistry sciences
Language(s) - English
Resource type - Journals
ISSN - 2007-1183
DOI - 10.29105/qh1.3-131
Subject(s) - argon , materials science , silicon carbide , whisker , scanning electron microscope , nitrogen , silicon , nitride , silicon nitride , infrared spectroscopy , metallurgy , mineralogy , chemical engineering , analytical chemistry (journal) , composite material , chemistry , environmental chemistry , layer (electronics) , organic chemistry , engineering
Silicon carbide and silicon nitride were synthesized from ashes obtained by heating rice hulls at 800C for 3 hours in argon. -SiC was produced from the ashes by reheating them at l 400C for 8 hours in argon, whereas -Si,N, was obtained by heating the ashes at temperatures ranging from 1250C to l 400C for periods of 3 to 6 hours in a nitrogen rich atmosphere. Toe products were characterized by infrared spectroscopy, X-ray and scanning electron microscopy. High purity -SiC and -Si,N, compounds with whisker type morphology were obtained. It was possible to obtain -Si,N, without SiC by heating the ashes for 6 hours at 1250C.