Browsing by Author "Kim, Ki-Dong"

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    Influence of BaO/(SrO + BaO) on some thermal properties of R₂O-RO-SiO₂ glasses for plasma display panel Substrate
    (Offenbach : Verlag der Deutschen Glastechnischen Gesellschaft, 1999) Kim, Ki-Dong; Hwang, Jong-Hee
    An influence of BaO/(SrO + BaO) on some thermal properties was studied in alkali - alkaline earth - silica PDP (Plasma Display Panel) Substrate glasses. SrO was replaced progressively by BaO at fixed concentration of alkaline earth oxides. Four viscosity fixed points at low temperature, thermal expansion coefficient and density of glasses were determined. The compositional dependence of those properties was discussed from the viewpoint of the mixed alkaline earth effect and the raw material cost.
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    Influence of mixed alkali oxides on some melt properties of TV screen glass
    (Offenbach : Verlag der Deutschen Glastechnischen Gesellschaft, 2000) Hwang, Jong-Hee; Park, Jeong-Hyun; Kim, Ki-Dong; Choi, Sang-Sam
    The influence of K2O/R2O (R2O = Na2O+K2O) on some melt properties was studied in alkali-alkaline earth-silicate TV screen glasses. Viscosity, surface tension, electrical resistivity, volatilization and devitrification of glass melts were determined. No mixed alkali effect was observed in viscosity, surface tension and liquidus temperature. They showed a linear behavior with increase of K2O/R2O. On the other hand, electrical resistivity and weight loss by volatilization showed a strong mixed alkali effect against relative alkali concentration. According to the dependence of viscosity, electrical resistivity and volatilization on K2O/R2O, the slope change of those properties took place at K2O/R2O = 0.4 to ≈ 0.5. The compositional dependence of viscosity, surface tension and liquidus temperature was discussed in terms of field strength, polarizability and material diffusion, respectively. A correlation was also discussed between the dependence of properties on K2O/R2O and the production process of TV screen glass. In conclusion, from the viewpoint of both production and application of TV glasses it was suggested that the mole fraction of K2O/R2O should lie between 0.2 and 0.5.