Author/Authors :
Najafi، A. نويسنده Department of Materials Science and Engineering, Saveh Branch, Islamic Azad University, Saveh, Iran. , , Golestani-Fard، F. نويسنده - Department of Materials Engineering, Iranian University of Science and Technology (IUST), Tehran, Iran Golestani-Fard, F. , Rezaie، H. R. نويسنده School of Materials Science and Engineering, Iran University of Science and Technology, Tehran, Iran. ,
Abstract :
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. Si29 NMR 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 B-SiC phase. Scanning electron microscopy
indicated agglomerates size in B-SiC synthesis is less than 100 nm. Finally, TEM studies revealed morphology of B-
SiC particles treated in 1500?C and after 1hr aging is spherical with (20-30) nm size.
