CORE SHAFT FOR PRODUCING QUARTZ GLASS

摘要

PROBLEM TO BE SOLVED: To provide a core shaft which is used for producing quartz glass, has good heat resistance, excellent load resistance and excellent processability and enables the precise production of a large synthetic quartz glass article at a low cost. SOLUTION: This core shaft which is used for producing the synthetic quartz glass article comprises a member obtained by joining two or more columnar or cylindrical carbon fiber-reinforced carbon composite material members to each other at screw portions in series.