| Autor: |
Zhong Li, Tie-Jun Shi, De-Xin Tan |
| Předmět: |
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| Zdroj: |
Journal of the American Ceramic Society; Oct2010, Vol. 93 Issue 10, p3499-3503, 5p, 3 Black and White Photographs, 1 Diagram, 3 Graphs |
| Abstrakt: |
Long silicon carbide (SiC) microwhiskers with a necklace-like morphology have been successfully synthesized by a carbothermal reduction process without using any catalyst. In the process, the wood flour/silica (SiO2)/phenolic composite was chosen as both silicon and carbon sources. The morphology and structure were investigated by X-ray diffraction (XRD), Fourier transform infrared spectroscopy (FT-IR), field-emission scanning electron microscopy (FESEM), and high-resolution transmission electron microscopy (HRTEM). Studies found that the as-synthesized whiskers were grown as single crystalline β-SiC along the (111) direction with the length up to hundreds of micrometers. The whiskers consisted of β-SiC strings with diameters of 1-2 μm and periodic β-SiC beads with diameters of 3-5 μm. On the basis of characterization results, a growth mechanism is proposed to clarify the formation of necklace-like whiskers. [ABSTRACT FROM AUTHOR] |
| Databáze: |
Complementary Index |
| Externí odkaz: |
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