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Glass-ceramics with Tunable Thermal Strain
Keywords: glass-ceramic, thermal expansion, tunable
The dynamics of multiple crystallizations in lithium-alumina-silicate glass-ceramics are analyzed using X-Ray diffraction technique. The thermal strain of glass-ceramics is highly nonlinear when the Cristobalite dominates crystallization, owing to the large volume change from alpha-beta inversion in Cristobalite crystals. On the other hand, a sequential crystallization, initially Quartz and then Cristobalite, results in thermal strains with much improved linearity. As the type and volume of each individual crystalline phases can be controlled in processing of glass-ceramics, the magnitude of the thermal strain, as well as the strain rate over temperature, could be tuned and optimized for targeted applications.
Steve Dai,
Sandia National Labs
Albuquerque, New Mexico
USA


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