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Microgravity silicon zoning investigationThe flow instabilities in floating zones of silicon were investigated and methods for investigation of these instabilities in microgravity were defined. Three principal tasks were involved: (1) characterization of the float zone in small diameter rods; (2) investigation of melt flow instabilities in circular melts in silicon disks; and (3) the development of a prototype of an apparatus that could be used in near term space experiments to investigate flow instabilities in a molten zone. It is shown that in a resistance heated zoner with 4 to 7 mm diameter silicon rods that the critical Marangoni number is about 1480 compared to a predicted value of 14 indicative that viable space experiments might be performed. The prototype float zone apparatus is built and specifications are prepared for a flight zoner should a decision be reached to proceed with a space flight experimental investigation.
Document ID
19850022760
Acquisition Source
Legacy CDMS
Document Type
Contractor Report (CR)
Authors
Kern, E. L. (Westech Systems, Inc. Phoenix, AZ, United States)
Gill, G. L., Jr. (Westech Systems, Inc. Phoenix, AZ, United States)
Date Acquired
September 5, 2013
Publication Date
May 15, 1985
Subject Category
Astronautics (General)
Report/Patent Number
NASA-CR-171531
NAS 1.26:171531
Accession Number
85N31073
Funding Number(s)
CONTRACT_GRANT: NAS8-34920
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.

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