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J. Korean Ceram. Soc. > Volume 17(4); 1980 > Article
Journal of the Korean Ceramic Society 1980;17(4): 213.
고팽창 결정화 유리의 유약에 관한 연구
박용완, 강은태1, 박찬성, 전문덕
Studies on the Glaze for High Expansion Glass Ceramics
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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