PREPARATION METHOD SILICA BODIES USING SOL-GEL METHOD

摘要

PURPOSE: A method for preparing silica glass body using sol-gel method, a method preparing an optical fiber preform by using the silica glass body prepared by the method and a method for preparing an optical fiber by using the optical fiber preform prepared by the method are provided, to improve the gel strength and the silica loading and to allow the impurities particles to be removed more easily. CONSTITUTION: The silica glass body is prepared by mixing 65 wt% or more of the silica particles having a specific surface area of 5-25 m2/g and containing 85 % or more of spherical particles with water to prepare sol; adding a water-soluble base to the sol to adjust pH of sol to be 10-13; adding a gelling agent to the sol; casting the sol into a mold; gelling the sol to form the gelled body; removing the gelled body from the mold; and firing the gelled body to sinter the gelled body into the silica glass body. Preferably the water-soluble base is tetramethylammonium hydroxide or tetraethylammonium hydroxide.