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http://dx.doi.org/10.3740/MRSK.2008.18.11.604

Sintering Behavior of Zircon with SiO2  

Lee, Keun-Bong (Department of Materials Science and Engineering, kyungnam University)
Kang, Jong-Bong (Department of Materials Science and Engineering, kyungnam University)
Publication Information
Korean Journal of Materials Research / v.18, no.11, 2008 , pp. 604-609 More about this Journal
Abstract
The sintering behavior of zircon with silica was investigated. Zircon with 5 vol% of sedimentation $SiO_2$ resulted in the apparent density of $4.45\;g/cm^3$, the diametral tensile strength of $12.125\;kgf/cm^2$, and the micro Vickers hardness of 1283 HV. The dissociation temperature and mechanical characteristics of the $ZrSiO_4$ were changed with different kinds of $SiO_2$. $SiO_2$ addition prevented dissociation of $ZrSiO_4$. Zircon with 5 vol% of sedimentation $SiO_2$ and with 5 vol% of fused $SiO_2$ resulted in increased diametral tensile strength and increased micro Vickers hardness by suppression of $ZrSiO_4$ dissociation and low temperature liquid $SiO_2$ formation. Zircon with fumed $SiO_2$ and quartz $SiO_2$ resulted in decreased diametral tensile strength and decreased micro Vickers hardness because of cristobalite and quartz phase formation and high temperature liquid $SiO_2$ formation. Zircon with 10 vol% of $SiO_2$ resulted in decreased diametral tensile strength and decreased micro Vickers hardness because of weak particle coupling due to excess formation of liquid $SiO_2$.
Keywords
$ZrSiO_4$; Zircon; Silica$SiO_2$;
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