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http://dx.doi.org/10.4191/KCERS.2009.46.5.467

Hot Pressing and Spark Plasma Sintering of AlN-SiC-TiB2 Systems using Boron and Carbon Additives  

Lee, Sea-Hoon (Engineering Ceramic Research Group, KIMS)
Kim, Hai-Doo (Engineering Ceramic Research Group, KIMS)
Publication Information
Journal of the Korean Ceramic Society / v.46, no.5, 2009 , pp. 467-471 More about this Journal
Abstract
Effects of boron and carbon on the densification and thermal decomposition of an AlN-SiC-$TiB_2$ system were investigated. $SiO_2$ was mostly removed by the addition of carbon, while $Al_2O_3$ formed $Al_4O_4C$ and promoted the densification of the systems above $1850^{\circ}C$. Rather porous specimens were obtained without the additives after hot pressing at $2100^{\circ}C$, while densification was mostly completed at $2000^{\circ}C$ by using the additives. The sintering temperature decreased further to $1950^{\circ}C$ by applying spark plasma sintering. The additives promoted the shrinkage of AlN by forming a liquid phase which was originated from the carbo- and boro-thermal reduction of $Al_2O_3$ and AlN.
Keywords
Additives; Aluminum nitride; Silicon carbide; Densification;
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