Journal of the Korean Ceramic Society (한국세라믹학회지)

The Korean Ceramic Society (한국세라믹학회)
권호 표지

The Phase Separation of Low Alkali Borosilicate Glass by Substituting $Li_2O$ for $Na_2O$

산화리튬의 치환에 따른 붕규산 유리의 분상에 관한 연구

  • Published : 1981.01.01
Download PDF
⟨ Previous Next ⟩

Abstract

The phase separation of low-alkali borosilicate glass with the composition of $6.25Na_2O$.$18.75B_2O_3$.$75.00SiO_2$(mole%) substituting $Li_2O$ for $Na_2O$ was studied. The phase separation in the temperature range of transformation was examined with various heating temperatures and soaking times. Durability to water, thermal expansion and specific density of the specimen were investigated and the microstructure of the separated phase was also observed by transmission electron micrograph techniques. The maximum alkali extraction result with the best phase separation effect was obtained when $Na_2O$ of the base glass was replaced with $1.88Li_2O$ (mole %) and electron micrograph of carbon film replica of $1.88Li_2O$$4.37Na_2O$.$18.75B_2O_3$.$75.00SiO_2$ (mole %) glass showed that the glass consisted of homogeneous two phases. The minimum specific density was shown with the specimen treated at 57$0^{\circ}C$ and it was also shown that the longer the treating time the lower the specific density. The apparent activation energies of approximately 45 kcal/mole by the alkali extraction and 43kcal/mole by the thermal expansion method were derived from the Arrhenius plots, respectively.

Keywords

References

  1. Glass Ind. v.10 no.269 Glas Resists Extreme Heat and Cold H. P. Hood;M. E. Nordbserg
  2. J. Am. Cer. Soc. v.27 no.299 Properties of Some Vycor-Brand Glasses H. P. Hood;M. E. Nordbserg
  3. u.s. Pat. 2,215, 039 Borosilicate Glass H. P. Hood;M. E. Nordbserg
  4. u.s. Pat. 2,286,275 Method of Treating Borosilicate Glass H. P. Hood;M. E. Nordbserg
  5. J. Soc. Glass Tech. v.10 no.102 The Influence of Boric Oxide on the Properties of Chemical and Heat-resisting Glasses W. E. S. Turner;F. Winks
  6. Stekle I Keramika v.14 no.57 Properties of Glasses in the Ternary System O. S. Molchanova
  7. G. I. R. I. no.299 The Phase Separation of Borosilicate Glass K. K. Damura
  8. The Structure of Glass v.8 no.80 Regions of Metastable Phase Separation in Ternary Alkaliborosilicate System F. Ya. Galakhov;O. S. Alekseeva
  9. G. I. R. I. no.339 Effects of Components Except the Alkalies on the Phase Separation of Alkali Silicate Glasses Yoshiro Moriya
  10. J.Cer.Soc. v.78 no.6 Yoshiro Moriya
  11. J. Kor. Cer. Soc. v.7 no.3 Studies on the Phase Separation of Borosilicate Glass by Addition of Phosphorus Pentoxide Y. W. Park
  12. J. Am. Cer. Soc. v.56 no.378 Effect of Minor Third Components on Metastable Immiscibility Boundaries Richard A. Obara
  13. G. I. R. I. v.16 no.4 Studies on Production and Application of High Silicate Glass K. H. Eguchi;K. J. Tasaka
  14. Glass Apparatus for Chemical Analysis
  15. J. Appl. Phys. v.13 no.602 Atomic Consideration of Immiscibility in Glass System B. E. Warren
  16. J. Cer. Soc. v.59 no.474 The Structure of Borosilicate Glasses Tosio Abe
  17. J. Am. Cer. Soc. v.35 no.284 Borosilicate Glasses Tosio Abe
  18. J. Cer. Soc. v.63 no.695 The Structure and Properties of Borosilicate Glasses Tosio Abe
  19. G. I. R. I. OSAKA v.11 no.108 Y. Mori;K. H. Eguchi
  20. J. Cer. Soc. v.63 no.685 Studies on Borosilicate Glasses K. K. Damura;Y. H. Mori
  21. J. Am. Cer. Soc. v.31 no.177 Effect of Heat-Treatment on the Density and Constitution of Highsilica Glasses of the Borosilicate Type A. Q. Tool
  22. Glass Eng S. Naruse
  23. Chemical Analysis of Soda Lim-magnesiasilica Glass