Studies on the Crystal Growth in ZnO-AI$_2$O$_3$-SiO$_2$Glass

ZnO-Al$_2$O$_3$-SiO$_2$ 유리에서의 결정성장에 관한 연구

  • 이종근 (한양대학교요업공학과) ;
  • 이병하 (한양대학교 요업공학과)
  • Published : 1975.03.01

Abstract

The object of this study is to find the optimum conditions for crystal growth and kinds of crystal in ZnO-Al2O3-SiO2 glass composition. At first, the base glass composed of ZnO (44.7%), Al2O3(14.0%) and SiO2(41.3%) was melted in propane gas furnace at 1450-150$0^{\circ}C$ for an hour, and then it was poured into the stainless steel mould heated previously at $600^{\circ}C$ to obtain the thin glass test piece. Four crystal forms from base glass such as stuffed keatite, zinc orthosilicate, zinc aluminosilicate, and cristobalite were crystallized during heat treatment between 80$0^{\circ}C$ and 110$0^{\circ}C$. For the investigation of crystal growth, X-ray diffractometer and thermal differential analysis were used and the growth rate of the four crystal forms were obtained by the method of Archimedes specific gravity and intensity comparison of X-ray diffraction peak. The results obtained were as follows. 1) Stuffed keatite peaks which started to appear after two hours at 80$0^{\circ}C$ were maximum after 11 hours and this crystal breaks down to willemite irreversibly at about 100$0^{\circ}C$. 2) Development of gahnite started at 85$0^{\circ}C$ and increased with temperature growth. 3) Stuffed keatite which had been transformed slowly into willemite at 100$0^{\circ}C$ was decreased with time and willemite increased until four hours. 4) Cristobalite began to be developed after treatment of 110$0^{\circ}C$.

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References

  1. U.S. Patent 2,920,971 Corning Glass Works S.D. Stookey
  2. J. Chem. Phys. v.24 Theory of crystal growth in undercooled pure liquids W.B. Hillig;D. Turnbull
  3. Symposium on Nucleation and Crystallization Crystal nucleation in a glass contgtitania R.D. Maurer
  4. Symposium on Nucleation and Crystalization in Glass and Metals Catalyzed Crystn in glass W. Vogel;K. Gerth
  5. Phys. and Chem. of Glasses v.10 no.4 Crystal growth studies in ZnO-Al₂O₃-SiO₂glasses P.W. McMillan;G. Partridge;J.G. Darrant
  6. J. Am. Ceram. Soc v.50 no.4 Crystalization and Chemical Strengthening of stuffed β-quartz glass-ceramics G.H. Beall;B.R. Karstetter;H.L. Rittler
  7. J. Am. Ceram. Soc. v.42 no.1 Tricalcium silicate and its stability within the system CaO-SiO₂ J.H. Weleh;W. Gutt
  8. J. Am. Miner v.39 no.7-8 The stuffed derivatives of the silica structure M. Buerger
  9. J. Am. Chem. Soc. v.71 no.6 The system lithium metasilicate-spodumenesilica R. Roy;E.F. Osborn
  10. Am. Mineral v.32 The structure of nepheline M. Buerger;J.K. Gilbert;H. Garbrielle
  11. Physical Properties of Glass J.E. Stanworth