NOVELTY - Carbon fiber-reinforced carbon composite cylindrical component is formed using carbon fiber-reinforced carbon composite material containing carbon fiber woven fabric including pitch-based carbon fiber. Mean linear thermal expansion coefficient of carbon fiber-reinforced carbon composite material along circumferential direction during heating at 800 degrees C from normal temperature is less than mean linear thermal expansion coefficient of quartz glass. The carbon fiber-reinforced carbon composite cylindrical component is used for crucible which supports and maintains quartz glass crucible.    USE - Carbon fiber-reinforced carbon composite cylindrical component is used for manufacture of crucible for supporting and maintaining quartz glass crucible (all claimed) used in apparatus used for manufacture of polycrystal for semiconductor material and solar cell material.    ADVANTAGE - The quartz glass crucible can be removed easily from the crucible manufactured using the carbon fiber-reinforced carbon composite cylindrical component, without destroying the quartz glass crucible. The carbon fiber-reinforced carbon composite cylindrical component is manufactured, with suppressed silicification.    DETAILED DESCRIPTION - Carbon fiber-reinforced carbon composite cylindrical component is formed using carbon fiber-reinforced carbon composite material containing carbon fiber woven fabric having pitch-based carbon fiber having tensile elasticity modulus of 400-900 GPa. Mean linear thermal expansion coefficient of carbon fiber-reinforced carbon composite material along circumferential direction during heating at 800 degrees C from normal temperature is less than mean linear thermal expansion coefficient of quartz glass. The carbon fiber-reinforced carbon composite cylindrical component is used for crucible which supports and maintains quartz glass crucible which accommodates molten material. INDEPENDENT CLAIMS are included for the following:    (1) manufacture of carbon fiber-reinforced carbon composite material cylindrical component, which involves bonding carbon fiber woven fabric using mixed adhesive agent containing thermosetting resin and carbon powder, and carrying out thermosetting process, carbonization process, graphitization process and high-purification process;    (2) carbon fiber-reinforced carbon composite material crucible (20), which has bottom portion (22) and straight component (21) provided on bottom portion. The straight component is formed using the carbon fiber-reinforced carbon composite material; and    (3) manufacture of carbon fiber-reinforced carbon composite material crucible.    DESCRIPTION OF DRAWING(S) - The drawing shows a schematic view of the crucible manufactured using the carbon fiber-reinforced carbon composite cylindrical component.    Carbon fiber-reinforced carbon composite material crucible (20)    Straight component (21)    Bottom portion (22)