Effect of Silica Sources on Synthesis of Alumina-Mullite-Silicon Carbide Composite

Abstract:

Synthesis of alumina-mullite-silicon carbide composite (Al₂O₃-Al₆Si₂O₁₃-SiCw) was obtained in situ by carbothermal reduction of a mixture of kaolin and two different silica sources. The carbothermal reduction was carried out in a horizontal tube furnace under flow of argon gas. The synthesized products were mixtures of alumina, mullite and silicon carbide in the form of whiskers. The effects of adding two different silica sources of rice husk ash and silica powder to the mixture of kaolin and activated carbon were investigated. XRD and SEM analyses indicate complete reaction of precursors to yield Al₂O₃-Al₆Si₂O₁₃-SiC as product powders, with the SiC having whisker morphology.

• Periodical: Advanced Materials Research (Volumes 488-489)
• Pages: 607-611
• DOI: https://doi.org/10.4028/www.scientific.net/AMR.488-489.607
• Online since: March 2012
• Authors: Niyomwas Sutham
• Keywords: Al₂O₃-SiC_W, Carbothermal Reduction, Kaolin, RHA

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