Journal of the Korean Ceramic Society (한국세라믹학회지)

The Korean Ceramic Society (한국세라믹학회)
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The Crystallization Characteristics Change in $Li_2O$.$Al_2O_3$.$SiO_2$ System Glass-Ceramics when Varying of RO Ratio and Increasing $R_2O_3$

$Li_2O$.$Al_2O_3$.$SiO_2$ 계 유리에서 RO치환 및 $R_2O_3$ 첨가에 따른 결정화 특성

  • Published : 1985.02.01
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Abstract

In the study the characteristics change of crystallized $Li_2O$.$Al_2O_3$.$SiO_2$ glass-ceramics when varying RO ratio and increasing Al2O3 were investigated to produce a glass-ceramics with high mechanical strength and low thermal expansion. Parent glass was obtained by melting at 1,350~1,40$0^{\circ}C$ for 3 hours and annealing at 45$0^{\circ}C$ and the various physical characteristics were measured. Results were as follows; 1. When ZnO was replaced by MgO thermal expansion coefficient was lowered when increasing ZnO content. 2. Major crystal phase was $\beta$-spodumene the crystal growth mophology was the three dimensional sphere and the activation energy for crystallization was 54.6 Kcal/mol. 3. Parent glass heat-treated at 95$0^{\circ}C$ for 10 hours had ; a) thermal expansion coeff. of $23.2{\times}10^{-7}$/$^{\circ}C$ b)whiteness of 76 c) microhardness of 1,089kg/$mm^2$

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References

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