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Cellular solidification of transparent monotecticsUnderstanding how liquid phase particles are engulfed or pushed during freezing of a monotectic is addressed. The additional complication is that the solid-liquid interface is nonplanar due to constitutional undercooling. Some evidence of particle pushing where the particles are the liquid phase of the montectic was already observed. Cellular freezing of the succinonitrile-glycerol system also occurred. Only a few compositions were tested at that time. The starting materials were not especially pure so that cellular interface observed was likely due to the presence of unkown impurities, the major portion of which was water. Topics addressed include: the effort of modeling the particle pushing process using the computer, establishing an apparatus for the determination of phase diagrams, and the measurement of the temperature gradients with a specimen which will solidify on the temperature gradient microscope stage.
Document ID
19870003193
Acquisition Source
Legacy CDMS
Document Type
Contractor Report (CR)
Authors
Kaulker, W. F. (Alabama Univ. Huntsville, AL, United States)
Date Acquired
September 5, 2013
Publication Date
December 1, 1986
Subject Category
Inorganic And Physical Chemistry
Report/Patent Number
NAS 1.26:177039
NASA-CR-177039
Accession Number
87N12626
Funding Number(s)
CONTRACT_GRANT: NAG8-69
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.

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