Synthesis of High Purity- Sicand- Si 3N4Fromricehulls

• Treviño, B. ^[1] ; Gómez, I. ^[1] ; Colás, R. ^[1]
  1. [1] Universidad Autónoma de Nuevo León

     Universidad Autónoma de Nuevo León

     México

     
• Localización: Química Hoy, ISSN-e 2007-1183, Vol. 1, Núm 3, 2011 (Ejemplar dedicado a: Abril-Junio 2011), págs. 32-38
• Idioma: inglés
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• Resumen

  • 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.