Process of manufacturing fiber reinforced ceramic hollow bodies

摘要

Production of hollow bodies made from fiber-reinforced ceramic materials comprises forming cores having the shape of the hollow chambers of the hollow bodies; forming a green body from the cores and a pressable mass; reinforcing the green body by heating to 120-280 degrees C under pressure; and carbonizing by heating to 750-1100 degrees C with the exclusion of air and other oxidizing agents to form a C/C body. The cores are made from a material which melts at a temperature lying above the hardening temperature during molding of the pressable mass. Preferred Features: The pressable mass is made from coal tar pitch, crude oil pitch and/or resins selected from phenol resins, epoxy resins, polyimides and filler-containing mixtures with furfuryl alcohol and furan resins. The cores are made from a filler-containing thermoplastic polymer or a foamed thermoplastic.