Accession Number : AD0854653

Title :   Continuous Sapphire Filament Production.

Descriptive Note : Final rept. 1 Nov 67-31 Mar 69,

Corporate Author : TYCO LABS INC WALTHAM MA

Personal Author(s) : Mermelstein, S.

Report Date : APR 1969

Pagination or Media Count : 166

Abstract : 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 1/2 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 in/min was achieved, with rates as high as 7 in/min being realized on a short-term basis. (Author)

Descriptors :   (*WHISKERS(CRYSTALS), SAPPHIRE), SINGLE CRYSTALS, FILAMENTS, MANUFACTURING, CRYSTAL GROWTH, PILOT PLANTS.

Subject Categories : Mfg & Industrial Eng & Control of Product Sys
      Crystallography

Distribution Statement : APPROVED FOR PUBLIC RELEASE