| 摘要 |
PURPOSE:To obtain the cylinder without being plastically deformed or damaged under high-temp. conditions by inserting an inner hollow cylinder consisting of graphite having a specified thermal expansion coefficient into an outer hollow cylinder consisting of a carbon fiber-reinforced carbon composite. CONSTITUTION:An inner hollow cylinder consisting of graphite having <=4.0X10<-6>/ deg.C thermal expansion coefficient is inserted into an outer hollow cylinder consisting of a carbon fiber-reinforced carbon composite so that the external surface of the inner cylinder is brought into contact with the internal surface of the outer cylinder to obtain a double hollow cylinder made of carbon. As mentioned above, a sleeve, viz. the inner cylinder, is formed with the carbon fiber-reinforced carbon composite, i.e., the material having a thermal expansion coefficient almost identical to that of the outer cylinder, and the double cylinder without being plastically deformed or damaged and high in practicability is obtained. The cylinder is appropriately used for a hot-press die to be used for sintering a ceramic powder, a cemented carbide, etc., or for the mechanical jig, support, etc., used in a high-temp. atmosphere. |
