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Low Gravity Rapid Thermal Analysis of GlassIt has been observed by two research groups that ZrF4-BaF2-LaF3-AlF3-NaF (ZBLAN) glass crystallization is suppressed in microgravity. The mechanism for this phenomenon is unknown at the present time. In order to better understand the mechanism, an experiment was performed on NASA's KC135 reduced gravity aircraft to obtain quantitative crystallization data. An apparatus was designed and constructed for performing rapid thermal analysis of milligram quantities of ZBLAN glass. The apparatus employs an ellipsoidal furnace allowing for rapid heating and cooling. Using this apparatus nucleation and crystallization kinetic data was obtained leading to the construction of time-temperature-transformation curves for ZBLAN in microgravity and unit gravity.
Document ID
Document Type
Conference Paper
Tucker, Dennis S.
(NASA Marshall Space Flight Center Huntsville, AL, United States)
Ethridge, Edwin C.
(NASA Marshall Space Flight Center Huntsville, AL, United States)
Smith, Guy A.
(Alabama Univ. Huntsville, AL, United States)
Date Acquired
August 22, 2013
Publication Date
January 1, 2004
Subject Category
Nonmetallic Materials
Meeting Information
Meeting: XX International Congress on Glass
Location: Kyoto
Country: Japan
Start Date: September 26, 2004
Distribution Limits
Work of the US Gov. Public Use Permitted.

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