Properties of mullite-bonded SiC ceramics from mullite precursor sol coated SiC powder and crystallization kinetics of mullite formation
IR@CGCRI: CSIR-Central Glass and Ceramic Research Institute, Kolkata
View Archive Info| Field | Value | |
| Title |
Properties of mullite-bonded SiC ceramics from mullite precursor sol coated SiC powder and crystallization kinetics of mullite formation
|
|
| Creator |
Baitalik, S
Kayal, Nijhuma Chakrabarti, Omprakash |
|
| Subject |
Engineering Materials
|
|
| Description |
Mullite bonded -bonded porous silicon carbide (SiC) ceramics were fabricated by sintering sol–gel mullite-coated SiC particles. The coated powder was characterized by measuring zeta potential at different pH, X-ray photoelectron spectroscopy (XPS), XRD analysis and thermal analysis. The thermal oxidation behaviour of coated SiC powder was examined by thermogravimetry (TG)-Differential thermal analysis (DTA) technique in dry air. Mullite formation exhibited two exothermic peaks; the first 1195–1213°C and the second at 1319–1358°C. The activation energy for mullite crystallization in the first step ranged from 884 to 1250 KJ mole− 1 and in second step it ranged from 759 to 1018 KJ mole− 1. Characterization of resulting SiC ceramics were done by XRD, SEM, TEM, EDS, porosity, pore size distribution analysis and measurement of mechanical strength. The ceramics with porosity ∼42 vol.-% exhibited flexural strength of ∼23 MPa. Microstructure observations revealed that neighbouring SiC particles were bonded by well-developed neck consisting of needle-shaped mullite grown in a siliceous matrix.
|
|
| Publisher |
Taylor & Francis
|
|
| Date |
2016-04
|
|
| Type |
Article
PeerReviewed |
|
| Format |
application/pdf
|
|
| Identifier |
http://cgcri.csircentral.net/3868/1/Kayal.pdf
Baitalik, S and Kayal, Nijhuma and Chakrabarti, Omprakash (2016) Properties of mullite-bonded SiC ceramics from mullite precursor sol coated SiC powder and crystallization kinetics of mullite formation. Materials Research Innovations, 20 (2). pp. 99-105. ISSN 1432-8917 |
|
| Relation |
http://cgcri.csircentral.net/3868/
|
|