Sintesis Whisker Silikon Karbid Bagian I: Disintesis Dari Sekam Padi

ABSTRAK The purpose of this work is to synthesize whisker silicon carbide using rice hull from Indonesia. The rice hull was taken .from the area of Yogyakarta, Indonesia. The synthesis was started with coking the rice hull at 900"C for I hour without contact with air. After coking, the specimens was reacted at 1500"C in an electric furnace in argon atmosphere, the flow rate of argon flow was kept around 2 liter/min. The process was continued by treating the specimen in a boiling of MOH solution to separate the SIC whisker with the silica, and finally heating the specimen at 800°C to eliminate the excess of carbon. The final product was silicon carbide whisker in the form of long SiC whisker and a small part in the form of wool like SiC whisker Key words: Rice hull, long SiC whisker, wool-like SiC Whisker

Sintesis Whisker Silikon Karbid Bagian Ii: Disintesis Dari Serat Karbon Dan Silica Fume

ABSTRAK This work investigated the use of carbon fiber and silica fume as a source of raw material for the production of silicon carbide whisker. Carbon and silica fume as the starting materials in the ratio of 7:10 by weight, were mixed in a jar mill for 8 hour. This mixture was then charged in an alumina crucible and heated at 1500"C for 1 hour with a heating rate of 2"C/min. in argon atmosphere having flow rate of 2 liter/min. The product contained silicon carbide, silica, and excess carbon. To remove the residual carbon, the product was put in a furnace and heated at 900°C for 1 hour. Its silica contents was eliminated by dissolving it in a boiling NaOH solution. The final product was silicon carbide in the form of particulate, needle-like SiC whisker, wool-like SiC whisker, and long SiC whisker. Key words: SiC whisker, carbon fiber, silica fume