Investigation on synthesis of cordierite bonded porous SiC ceramics with emphasis on bond phase formation

Cordierite-bonded porous SiC ceramics were synthesized from SiC, Al2O3 and MgO powders with varying petroleum coke (PC) as the sacrificial pore former. To trace the path of development of the oxide binder phase and mechanistic steps of oxidation reaction of a PC pore former powder, thermal analysis...

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Bibliographic Details
Published in:Materials chemistry and physics 2019-01, Vol.222, p.275-285
Main Authors: Dey, Atanu, Chakrabarti, Omprakash
Format: Article
Language:English
Subjects:
Aluminum oxide
Ceramic bonding
Ceramic powders
Ceramics
Chemical analysis
Chemical synthesis
Cordierite
Cordierite crystallization
Cristobalite
Microstructure
Organic chemistry
Oxidation
Oxide bonding
Petroleum coke
Pore size
Porosity
Porous media
Porous SiC ceramics
Silicon carbide
Thermal analysis
X-ray diffraction
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Summary:Cordierite-bonded porous SiC ceramics were synthesized from SiC, Al2O3 and MgO powders with varying petroleum coke (PC) as the sacrificial pore former. To trace the path of development of the oxide binder phase and mechanistic steps of oxidation reaction of a PC pore former powder, thermal analysis (up to 1400 °C in air) of the precursor powders was studied with non-isothermal method varying different heating rates. The results indicated the transformation of cordierite binder phase and the average activation energy was determined to be 840 ± 27 kJ mol−1. The formation of the oxide binder phase (cristobalite (24–31 wt%) and cordierite (21–28 wt%)) and pore phase (porosity of 30–67 vol% and average pore size of 3–36 μm) were further analysed by conducting X-ray diffraction test, chemical analysis and microstructure examination for better understanding the formation of the pore phase and the binder phases of the ceramics for its applicability in the field of porous media at hostile conditions. [Display omitted] •Evolution of bond & pore phase in porous SiC ceramics was studied by thermal analysis.•Oxidation of pore former has insignificant effects on oxide bonding process.•Process of cordierite crystallization has an activation energy of 840 ± 27 kJ mol−1•Dissolution of Al2O3 & MgO into silica-rich phase controlled the cordierization reaction.•Cordierite bonded SiC ceramics have interconnected open porous network.
ISSN:0254-0584
1879-3312
DOI:10.1016/j.matchemphys.2018.10.025