Iranian Journal of Materials Science and Engineering
Iran University of Science & Technology
Fri, Nov 15, 2024
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Volume 11, Issue 1 (march 2014)
IJMSE 2014, 11(1): 53-61 |
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A. Najafi, F. Golestani-Fard, H. R. Rezaie. THE EFFECT OF PROCESSING PARAMETERS ON SOL GEL SYNTHESIS OF β-SiC NANO POWDER. IJMSE 2014; 11 (1) :53-61
URL: http://ijmse.iust.ac.ir/article-1-632-en.html
URL: http://ijmse.iust.ac.ir/article-1-632-en.html
Abstract: (24500 Views)
Mono dispersed nano SiC particles with spherical morphology were synthesized in this project by hydrolysis and condensation mechanism during sol gel processing. pH, temperature and precursor’s ratio considered as the main parameters which could influence particles size. According to DLS test results, the smallest size of particles in the sol (<5nm) was obtained at pH<4. It can be observed from rheology test results optimum temperature for achieving nanometeric gel is about 60 ˚C. The optimum pH values for sol stabilization was (2-5) determined by zeta potentiometery. Si 29NMR analysis was used in order to get more details on final structure of gel powders resulted from initial sol. X-ray diffraction studies showed sythesized powder consists of β-SiC phase. Scanning electron microscopy indicated agglomerates size in β-SiC synthesis is less than 100 nm. Finally, TEM studies revealed morphology of β-SiC particles treated in 1500˚C and after 1hr aging is spherical with (20-30) nm size
Keywords: carbides; nanostructures; sol-gel chemistry; nuclear magnetic resonance (NMR); microstructure.
Type of Study: Research Paper |
Subject:
materials engineeing and special subjects
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