Design of glass-ceramics for science and industry
Conference
·
OSTI ID:126599
- Corning Inc., NY (United States)
Glass-ceramics are materials formed by die controlled devitrification of glass. High-speed plastic forming processes developed in the glass industry (e.g. pressing, rolling, etc.) are used to create articles essentially free of internal homogeneities. These are then converted without shape change to a ceramic via efficient internal nucleation during a thermal cycle. Alternatively, glass powders are preformed and sintered in a viscous state just prior to crystallization. The properties of glass-ceramics depend primarily on those of the constituent phases and the type of microstructure developed. Framework silicates such as low-thermal-expansion {beta}-quartz solid solutions can be precipitated as nanocrystals, capable of optical transparency. Sheet silicates like fluormica combine machinability and excellent dielectric behavior. Chain silicates form acicular crystals which develop unusual strength and toughness, and when combined with certain phosphates are bioactive and biocompatible. Numerous applications for glass-ceramics have been found in scientific, electronic, medical, space, and consumer fields.
- OSTI ID:
- 126599
- Report Number(s):
- CONF-950402--
- Country of Publication:
- United States
- Language:
- English
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