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Affiliation of Author(s):材料科学工程学院
Teaching and Research Group:材料科学工程学院
Journal:Advanced Materials Research
Funded by:其他课题
Key Words:SiC whiskers; rice husks; pyrolyse
Abstract:SiC whiskers were prepared through carbonthermal reduction in two steps. Firstly raw rice husks (RHs) were pyrolysed in a graphite vacuum furnace at 460°C for 2 hours and coked rice husks were pyrolysed at 1400°C in argon atmosphere. Scanning electron microscopy (SEM), X-ray diffraction (XRD), transmission electron microscopy (TEM) was employed to characterize the morphology and phase composition of SiC whiskers. The results show that the diameters of SiC whiskers range in 20-200 nm and their lengths are in the range from hundreds of microns to several millimeters. The whiskers are straight and slightly rough and consist of β-SiC crystals with bamboo-like structure. Vapor-solid (VS) mechanism plays a key role at the early stage of SiC formation and VLS mechanism and vapor phase mechanism of the whiskers are involved during the growth of SiC whiskers.
First Author:Jia Suqiu
Indexed by:Journal paper
Volume:236-238
Page Number:1
ISSN No.:1022-6680
Translation or Not:no
Date of Publication:2011-06-01