N. Gopalakrishna Nair

Paramanand Paramanano Singh

Agricultural wastes

CATALYSTS

Crystal microstructure

Fourier transform infrared spectroscopy

Hydrolysis

Morphology

Scanning electron microscopy

silica

Silicon carbide

Stacking faults

X ray spectroscopy

COCONUT SHELLS

ENERGY DISPERSIVE X RAY SPECTROSCOPY (EDS)

Crystal whiskers

IIT Madras is a public technical and research university located in Chennai, Tamil Nadu. Founded in 1959, it is recognised as an Institute of National Importance.

IIT Madras has been ranked as the top engineering institute in India for four years in a row by the National Institutional Ranking Framework of the MHRD

It currently offers undergraduate, postgraduate and research degrees across 16 disciplines in Engineering, Sciences, Humanities and Management. About 596 faculty belonging to science and engineering departments and centres of the Institute are engaged in teaching, research and industrial consultancy.

IIT Madras

Synthesis and characterization of SiC whiskers from coconut shells

Journal of Materials Science Letters

In this paper, we report the synthesis of SiC whiskers by the carbothermal reduction of a mixture of rice husk (RH) and coconut shell (CS). Addition of polycarbosilane (PCS) to the mixture of RH and CS led to extensive growth of the whiskers. The phase and microstructural analysis of the synthesized whiskers were carried out by X-ray diffraction and electron microscopic techniques, respectively. The synthesized whiskers were single crystals of β-SiC, grown on a (111) plane along the (111) direction. The vapor-solid and vapor phase mechanisms played a more dominant role in massive whisker growth than the vapor-liquid-solid mechanism. The increased SiO gas concentration, due to the evolved SiO and CO gases from the highly reactive SiOC ceramics formed from the PCS, facilitated the extensive growth of SiC whiskers. The whisker growth was more on the CS surface than on the RH surface, and attributed to the higher surface area and the carbon reactivity of the CS. The Raman spectroscopy showed the presence of 4H-SiC, 6H-SiC and 15R-SiC type stacking faults in 3C β-SiC. © 2015 Elsevier Ltd and Techna Group S.r.l. All rights reserved.

Ceramics International

Effect of polycarbosilane addition to a mixture of rice husk and coconut shell on SiC whisker growth

Journal	Data powered by TypesetJournal of Materials Science Letters
Publisher	Data powered by TypesetSpringer Netherlands
ISSN	02618028
Open Access	No