| Properties of Porous SiC Ceramics Processed by Gelation
and Consolidation of Boehmite Coated SiC Suspensions |
Sanchita Baitalik1, Dipankar Panigrahi2 and Nijhuma Kayal1,*
Pages : 222-227
DOI : 10.1080/0371750X.2017.1353924 |
| Abstract |
| SiC powder was dispersed in various concentrations of boehmite sol. The boehmite coated
SiC powder was characterized by zeta potential measurement, TEM and FT-IR analyses.
Mullite bonded porous SiC ceramics were fabricated by sintering boehmite coated SiC
powder compact via a pressureless sintering in air at 1300oC and were characterized by
XPS, XRD, SEM analyses. The sintered ceramics have an interconnected open porous
network with near uniform pore diameter. Rod shaped mullite crystals were observed in
the neck region that bonded the SiC particles together. Effect of boehmite sol concentration
on phase composition, microstructure, flexural strength, porosity and pore size
distribution was studied. The ceramics synthesized from 30 wt% boehmite sol coated
SiC powder contained 26 wt% mullite with ~30 vol% porosity.
[Keywords: Boehmite, Sol-gel, Coating, Porous SiC ceramics] |
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