Potency of Different Carbon Sources in Reduction of Microsilica to Synthesize SiC from Mechanically Activated Powder Mixtures

In the present study, the influences of three different types of carbon (carbon black, graphite, and petroleum coke) on SiC synthesis via mechanical activation and sintering were evaluated. In this regard, the phase components, morphology, and the formation mechanism were investigated. SiC nanoparti...

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Bibliographic Details
Published in:International journal of applied ceramic technology 2016-09, Vol.13 (5), p.937-947
Main Authors: Jamshidi, Amin, Tajizadegan, Hamid, Torabi, Omid
Format: Article
Language:English
Subjects:
Carbon
Carbon black
Formations
Graphite
microsilica
Morphology
Petroleum coke
SiC
Silicon carbide
Sintering (powder metallurgy)
vapor-liquid-solid mechanism
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Summary:In the present study, the influences of three different types of carbon (carbon black, graphite, and petroleum coke) on SiC synthesis via mechanical activation and sintering were evaluated. In this regard, the phase components, morphology, and the formation mechanism were investigated. SiC nanoparticles were detected to be formed after 4 h of milling and sintering at 1450°C, regardless of the sources of carbon. The carbon types exert their effects on the morphology of the as‐synthesized particles, where carbon black leads to form rod‐like SiC particles and the other two carbon types result in semi‐spherical SiC particles. This is due to the dominant mechanism in the mentioned process. The rod‐like particles obtained from the carbon black‐containing powder were synthesized via the VSL mechanism, whereas the solid‐state reactions occurred to form the SiC particles in the graphite‐ or petroleum coke‐containing samples. In the VSL mechanism, any increase in the milling time leads to facilitate the SiC formation due to entrance of Fe debris, whereas in the other samples (graphite or petroleum coke) the procedure is reversed.
ISSN:1546-542X
1744-7402
DOI:10.1111/ijac.12567