Method for the preparation of a dehydrated quartz glass material

Details Method for the preparation of a dehydrated quartz glass material Method for the preparation of a dehydrated quartz glass material

1985-05-31

1987-03-17

Schor, Kenneth M.

Glass manufacturing

Processes

With chemically reactive treatment of glass preform

65DIG16, C03C 2300, C03B 2900

Patent

active

046505113

ABSTRACT:
The invention provides an efficient method for the dehydration, i.e. removal of silicon-bonded hydroxy groups, of a porous silica body before vitrification as a precursor of quartz glass-made optical fibers obtained by the flame hydrolysis of a silicon compound and deposition of fine silica particles formed therefrom. The problems and disadvantages accompanying the use of conventional dehydrating agents can be solved in the invention by heating the hydroxy-containing porous silica body at 1000.degree. to 1300.degree. C. in an atmosphere containing thionyl fluoride or sulfuryl fluoride as the dehydrating agent which is also effective as a dechlorinating agent so that the optical fibers prepared from the quartz glass material of the invention are highly transparent and resistant against hydrogen-containing atmosphere at elevated temperatures.

REFERENCES:
patent: 4263030 (1981-04-01), Kobayashi

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