Glass manufacturing – Processes – Forming product or preform from molten glass
Patent
1985-06-13
1988-06-07
Bashore, S. Leon
Glass manufacturing
Processes
Forming product or preform from molten glass
65 301, 65 33, C03C 2502, C03C 1500, C03C 1000
Patent
active
047493950
ABSTRACT:
Preforms for drawing into glass fibers are relatively quickly produced by extruding filaments or tapes from polysiloxanes and/or heteropolysiloxanes and curing such filaments. A cylindrical wound body is produced from such cured filaments by winding such filaments onto an arbor. The wound body is converted, by heating in an oxidizing atmosphere, into an oxide body composed of SiO.sub.2 and, under certain conditions, containing doping amounts of select heteroelements present in the heteropolysiloxane. After removal of the arbor, a gas stream containing chlorine gas is flushed at a temperature of about 1000.degree. to 12,000.degree. C. through the oxide body to remove any traces of water and the dry oxide body is sintered into glass at a temperature of about 1200.degree.-1500.degree. C. The tubular preform thereby attained is collapsed and a glass fiber is drawn therefrom. This process is particularly suitable for the fabrication of gradient optical fibers. A desired refractive index profile can already be taken into consideration in the production of the wound body.
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Bashore S. Leon
Boyer Michael K.
Siemens Aktiengesellschaft
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