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Formation of silicon nitride whiskers from rice hulls.
Journal of the Society of Materials Science Japan1988Vol. 37(412), pp. 65–69
Abstract
The formation of Si3N4 whiskers from rice hulls was studied. Si3N4 whiskers were synthesized by nitridation of SiO2-C system in N2-gas flows at 1400°C and 1450°C. The shape and microstructure of the whiskers were inspected by means of SEM and TEM. The whiskers of a cylindrical shape grew along the direction whithout any deffects. The phase of the whiskers was α-type and their diameter and length were 0.1 to 0.5μm and 300 to 1800μm, respectively. The droplet of Fe-Si system was found at the tip of the whiskers. It is suggested that the VLS mechanism controls the growth of whisker.
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