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Record Details

Record 41 of 12159
Computer-controlled float zone crystal growth
External Online Source: doi:10.1063/1.1143884
Author and Affiliation:
Chan, Y. T.(Scientific Research Associates, Inc., Glastonbury, CT, United States)
Mailloux, P. A.(Advanced Materials Technology, Inc., Danbury, CT, United States)
Abstract: A PC-based computer control system to automate a high-temperature float zone growth of titanium carbide is reported. The control strategy of the computer control system relies on the relations derived from a combination of empirical relations and results from detailed mathematical analysis of the physical transports of the entire float zone assembly. A system control computer program was written to establish real-time determination of the size of the molten zone from a thermal image, control parameters from established relationships, and collected processed data to achieve control objectives. We found that the developed computer control allows the growth process to be operated nearer the stability limit. Any slight variations in growth conditions can be corrected in time to avoid any instability growth, which otherwise cannot be adjusted via manual control.
Publication Date: Sep 01, 1993
Document ID:
19940034137
(Acquired Dec 28, 1995)
Accession Number: 94A10792
Subject Category: SOLID-STATE PHYSICS
Document Type: Journal Article
Publication Information: Review of Scientific Instruments (ISSN 0034-6748); 64; 9; p. 2643-2649.
Publisher Information: United States
Contract/Grant/Task Num: NAS8-38487
Financial Sponsor: NASA; United States
Organization Source: NASA Marshall Space Flight Center; Huntsville, AL, United States
Description: 7p; In English
Distribution Limits: Unclassified; Publicly available; Unlimited
Rights: Copyright
NASA Terms: AUTOMATION; CRYSTAL GROWTH; FLOAT ZONES; NUMERICAL CONTROL; SISO (CONTROL SYSTEMS); TITANIUM CARBIDES; PERSONAL COMPUTERS; PROPORTIONAL CONTROL; REAL TIME OPERATION
Imprint And Other Notes: Review of Scientific Instruments vol. 64, no. 9 p. 2643-2649. Sept. 1993
Availability Source: Other Sources
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