Studies on the Phase Separation of the Borosilicate Glass by Addition of Titanium Dioxide

,; ,; ,; ,

J. Korean Ceram. Soc. > Volume 18(4); 1981 > Article

Journal of the Korean Ceramic Society 1981;18(4): 257.

$TiO_2$ 첨가에 따른 붕규산 유리의 분상에 관한 연구

박용완, 민병욱

한양대학교 공과대학 기계재료공학과

Studies on the Phase Separation of the Borosilicate Glass by Addition of Titanium Dioxide

ABSTRACT

The tendency of glass containing titanium-dioxide to separate into two phases can be attributed to a change of the coordination number of titanium from six to four on increase of temperature and to "freezing" of the high temperature four fold coordination on cooling of the melt. Addition of TiO2 to the basic glass 8.7 $Na_2O$ 22.4B2O3 68.9 $SiO_2$ was varied 5 to 25 parts. The phase separation in the temperature range of transformation was examined with each heating temperature and soaking time. As the experimental results, the most distinct phase separation were obtained from alkali extraction method when $TiO_2$ was added 15 parts. The apparant activation energy was 30.5 Kcal/mole by alkali extraction method derived from Arrhenius plots.ius plots.