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Borodin, A.V.,Borodin, V.A.,Petkov, I.S.,Sidorov, V.V. The Korea Association of Crystal Growth 1999 韓國結晶成長學會誌 Vol.9 No.4
New method of control based upon a physical model of the Stepanov growth technique has been developed. The controller keeps the system stable and completely denies operator's interference into the process. The system demonstrates very reliable results under commercial production of shaped sapphire crystals.
Computer modeling of a multi-run growth technique for sapphire ribbons
A.V.Borodin,V.A.Borodin,A.V.Zhdanov,I.S.Petkov 한양대학교 세라믹연구소 2003 Journal of Ceramic Processing Research Vol.4 No.2
Multi-run growth is most commonly applied to provide a high yield of shaped crystals. The presence of several crystals in a melting zone and a radiative heat exchange between them pose difficulties in the optimization of the heat zone design and growth conditions. The trial-and-error experiments can hardly be applied because of high cost in terms of materials and time. Moreover, the presence of many parameters under consideration and their interaction make a tentative search a very arduous task. In this paper, the multi-run growth process for sapphire ribbons is studied on the basis of mathematical modeling and the optimized relationships are found.