Hostname: page-component-586b7cd67f-rcrh6 Total loading time: 0 Render date: 2024-11-25T16:32:39.138Z Has data issue: false hasContentIssue false
  • English
  • Français

Directionally Crystallized Potassium Silicate Glass-Ceramic

Published online by Cambridge University Press:  15 February 2011

Grant Lu  and
L. C. Klein
Grant Lu
Affiliation:
Ceramics Department Rutgers-The State University of New JerseyP. O. Box 909 Piscataway, NJ 08854USA
L. C. Klein
Affiliation:
Ceramics Department Rutgers-The State University of New JerseyP. O. Box 909 Piscataway, NJ 08854USA
Get access

Abstract

Glasses in the potassium silicate system were directionally crystallized in a temperature gradient furnace. A composition of approximately 40 wt % K2O and 60 wt % SiO2 was used. Quenched glass samples were placed in alumina crucibles with K2O·2SiO2 seed crystals on the bottom surface. The crucible was translated from the hot zone to the cold zone of the furnace. A thermal gradient of 14°C/mm was maintained. Sample height was about 6 mm and translation rates were about 5 mm/h, 1.33 mm/h and 0.83 mm/h. Well-aligned crystals were observed to grow from the bottom of the crucible. Individual crystals were about 0.07 mm wide and extended the length of the crucible parallel to the thermal gradient. The degree of alignment was found to depend on initial temperature and translation rate. The samples have been studied using primarily optical microscopy.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 12: Symposium L – In Situ Composites IV , 1981 , 231
Copyright
Copyright © Materials Research Society 1982

Access options

Get access to the full version of this content by using one of the access options below. (Log in options will check for institutional or personal access. Content may require purchase if you do not have access.)

References

REFERENCES

1. Barry, T. I. et al. , “The Crystallization of Glasses Based on Eutectic Compositions in the System Li2O-Al2O3-SiO2. Part 1. Lithium metasilicate-β spodument”, J. Materials Science, 4 (7) (1969) pp. 596–612.Google Scholar
2. Barry, T. I. et al. , “The Crystallization of Glasses Based on Eutectic Compositions in the System Li2O-Al2O3-SiO2. Part 2. Lithium metasilicate -β eucryptite”, J. Materials Science, 5 (2) (1970) pp. 117–126.Google Scholar
3. Ashbrook, R. L., “Directionally Solidified Ceramic Eutectics”, J. American Ceramic Society, 60 (9–10) (1977) pp. 428–435.Google Scholar
4. Kennard, F. I., Bradt, R. C., and Stubican, V. S., “Eutectic Solidification of MgO-MgAl2O4”, J. American Ceramic Society, 56 (11) (1973) pp. 566–569.CrossRefGoogle Scholar
5. Atkinson, D. I. H. and McMillan, P. W., “Glass-Ceramics with Random and Oriented Microstructures. Part 3. The Preparation and Microstructure of an Aligned Glass-Ceramic”, J. Materials Science, 12 (3) (1977) pp. 443–450.Google Scholar
6. Maries, A. and Rogers, P. S., “Continuous Unidirectional Crystallization of Fibrous Metasilicates from Melts”, J. Materials Science, 13 (1978) pp. 2119–2130.Google Scholar
7. Arioko, M., Kokubu, T. and Tashiro, N., “Fabrication of Oriented Polycrystalline Li2O·2SiO2 Ceramic by Unidirectional Solidification of its Melt”, Yogyo-Kyokai-Shi, 85 (10) (1977) pp. 501–506 Google Scholar
8. Melling, P. J. and Duncan, J. F., “Directionally Crystallized Sodium Lead Silicate Glass-Ceramic”, J. American Ceramic Society, 63 (5–6) (1980) pp. 264–267.Google Scholar
9. Blackwood, N. K. and Klein, L. C., “Evaluation of Feldspar Sources for Eutectic Melts”, to appear in Bulletin of the American Ceramic Society, 61 (2) (1982).Google Scholar
10. Scherer, G. W. and Uhlmann, D. R., “Diffusion-Controlled Crystal Growth in K2O-SiO2 Compositions”, J. Non-Crystalline Solids, 23 (1977) pp. 59–80.Google Scholar
11. Kracek, F. C., Bowen, N. L. and Morey, G. W., “Equilibrium Relations and Factors Influencing Their Determination in the System K2SiO3-SiO2”, J. Physical Chemistry 41 (9) (1937) pp. 1183–1193.Google Scholar