Effects of SiO2 and 3Y-TZP on Mechanical Properties of Zircon

Title & Authors
Effects of SiO2 and 3Y-TZP on Mechanical Properties of Zircon
Jang, Ho Su; Cho, Bum Rae;

Abstract
Zircon, having excellent thermal, chemical, and mechanical properties, is utilized in refractory materials, electronic materials, chemical machines, structural materials, etc. However, zircon generally shows thermal dissociation to zirconia($\small{ZrO_2}$) and silica($\small{SiO_2}$) around the sintering temperature of $\small{1540^{\circ}C}$, and when zircon particles are small and impurities are present, thermal dissociation is known to occur at around $\small{1100^{\circ}C}$. This reduces the mechanical properties of $\small{ZrSiO_4}$. In this research, the effect of adding $\small{SiO_2}$ and 3Y-TZP to $\small{ZrSiO_4}$ has been studied in order to suppress dissociation and improve the mechanical properties. Addition of $\small{SiO_2}$ suppressed the dissociation of $\small{ZrSiO_4}$ at lower temperatures. It also enabled optimum packing between the particles, resulting in a dense microstructure and good mechanical properties. When 3Y-TZP was added, recombination with the dissociated $\small{SiO_2}$ resulted in good mechanical properties by suppressing the generation of pores and the densification of the microstructure.
Keywords
zircon;zirconia;silica;thermal dissociation;
Language
Korean
Cited by
1.
, Journal of Nuclear Science and Technology, 2017, 54, 11, 1267
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