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Gel Precursors as Glass and Ceramic Starting Materials for Space Processing Applications ResearchThe crystallization kinetics and glass forming ability of reluctant glass formers is investigated. This could ultimately aid the formation of bulk samples of unique glass compositions outside of normal glass forming regions allowing the optimization of certain properties of the glass. One important aspect of processing in space is the containerless undercooling of molten substances. Theoretically, the extent of undercooling can be greatly enhanced by solidifying in the absence of heterogeneous nucleation resulting from contact with crucibles or molds. Techniques were established for the measurement of crystallization kinetics and critical cooling rates. The glass formation ability and crystallization kinetics of Ga2O-43CaO and several Al2O3-CaO compositions were measured. An apparatus was set up to measure the temperature of spherical samples on a thermocouple at large cooling rates. The time and temperature of nucleation is recorded and the probability of nucleation at various cooling rates can be measured.
Document ID
19860000683
Acquisition Source
Legacy CDMS
Document Type
Other
Authors
Downs, R. L.
(KMS Fusion, Inc. Ann Arbor, MI, United States)
Miller, W. J.
(KMS Fusion, Inc. Ann Arbor, MI, United States)
Date Acquired
August 12, 2013
Publication Date
May 1, 1985
Publication Information
Publication: NASA, Washington Microgravity Sci. and Appl. Program Tasks
Subject Category
Astronautics (General)
Accession Number
86N10150
Funding Number(s)
CONTRACT_GRANT: NAS7-100
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.
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