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J. Korean Ceram. Soc. > Volume 33(8); 1996 > Article
Journal of the Korean Ceramic Society 1996;33(8): 871.
Fly Ash를 이용한$beta$-Sialon 분말합성
최희숙, 노재승, 서동수
충남대학교 재료공학과
Synthesis of $beta$-Sialon Powder from Fly Ash
It is believed that fly ash could be suitable for preparing the sialon by carbothermal reduction method because the total amount of SiO2 and Al2O3 is above 80% and the unburned residual carbon is above 5% within the fly ash. The effects of reaction temperature (1350, 1400, 145$0^{circ}C$) reaction time (1, 5, 10 hours) and the amount of carbon additions (C/SiO2=2, 3, 4 mole) on the $beta$-sialon synthesis were obserbed, It was conformed that $beta$-sialon (Z=2.15~2.18) was formed as major phase under all of the synthesis conditions and small amount of Si2ON2 SiC, AlN and Si3N4 was formed depending on the synthesis conditions. FeSix intermetal-lic compound was formed above 140$0^{circ}C$ reaction temperature due to the large amount of iron oxides within the raw fly ash.
Key words: Fly ash, $\beta$-sialon, Carbothermal reduction, $FeSi_x$, intermetallic compound
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