| 摘要 |
PROBLEM TO BE SOLVED: To provide a manufacturing process of an ingot for an optical fiber preform with which a large-sized porous preform is sintered even in an atmosphere containing high temperature carbon and a hanging member used in the process. SOLUTION: The manufacturing process of the ingot for the preform comprises forming a porous preform 3 by depositing soot around the starting material, hanging down the porous preform in a sintering furnace, dehydrating and sintering it for vitrification to obtain a transparent glass. A hanging member made of silicon nitride covered with silicon carbide is used for hanging the porous preform 3. The hanging member consists of a hanging fixture 2 and a shaft 1. They are screwed together. The porous preform 3 is fixed to the fixture 2 with a pin 6 via its quartz shaft 4 or a dummy 5 mounted on the shaft. COPYRIGHT: (C)2004,JPO
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