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$TiO_2$와 $ZrO_2$의 첨가에 따르는 $Li_2O-Al_2O_3-SiO_2$ 계 유리의 결정화에 관한 연구
박용완,전문덕 한국세라믹학회 1981 한국세라믹학회지 Vol.18 No.3
The effect of additions, $TiO_2$</TEx> and $ZrO_2$ as nucleant on the base glass which composition was determined to 0.97 $Li_2O-Al_2O_3-SiO_2$ has been investigated by means of D.T.A., X-ray diffraction and dilatation. $TiO_2$</TEx> and $ZrO_2$ as nucleant were added 0.06mole, in which ratios of $TiO_2$</TEx>/$ZrO_2$ were varied 1/0, 2/1, 1/1, 1/2 and 0/1. The crystalline phases were appeared to $\beta$-spodumene as principal, $\beta$-eucryptite and $ZrO_2$ as secondary, regardless of nucleant variations. The crystallinity of the crystallized glass added $TiO_2$</TEx>, $ZrO_2$ mixture as nucleant was higher than that of the glass added $TiO_2$</TEx> or $ZrO_2$ only. The crystallinity of the glass added $TiO_2$</TEx>/$ZrO_2$ =1/1 was highest. Increasing the addition of $ZrO_2$, it has been observed that the crystal growing temperature became higher.
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박용완,강은태,박찬성,전문덕 한국세라믹학회 1980 한국세라믹학회지 Vol.17 No.4
A glass-ceramics material of composition %SiO_2$: 38.50, $Al_2O_3$: 26.00, $Na_2O$: 18.00, CaO: 6.00, MgO: 4.00, $TiO_2$: 7.50 was strengthened by coating a series of glazes$(SiO_2-B_2O_3-Al_2O_3-CaO-PbO-Na_2O-)$, which has lower thermal expansion coefficient than that of the glass-ceramics. The thermal expansion coefficient of the glazes ranges $80~90{\times}10^{-7}$cm/cm/$^{\circ}C$, whereas that of the glass-ceramics is $115{\times}10^{-7}$cm/cm/$^{\circ}C$. The glass-ceramics was identified to be composed of nepheline, carnegieite low form, and meta sodium silicate crystal by X-ray diffraction phase analysis. The glaze, having lower melting point and appropriate thermal expansion coefficient, was tried to be stable and good at secondary heat treatment.
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