Continuous Sapphire Filament Production.
Final rept. 1 Nov 67-31 Mar 69,
TYCO LABS INC WALTHAM MA
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A subscale manufacturing process was developed for the production of continuous single crystal sapphire filament pulled from the melt. A continuous filament pulling device was developed which, when used with rigid and non-rigid filament guidance techniques, allowed uninterrupted pulling to continue for as long as 8 12 hours, when crucible capacity alone became the limiting factor. The continuous filament produced ranged in diameter from 1.15 to 12.40 mils and had a mean tensile strength of 246 kpsi. The grown material exhibited very minor changes in impurity level compared with the raw material used. A maximum repeatable growth rate of 1.5 inmin was achieved, with rates as high as 7 inmin being realized on a short-term basis. Author
- Manufacturing and Industrial Engineering and Control of Production Systems