Process for producing one end-sealed ceramic double wall- structural tubes

摘要

One end-closed ceramic double wall-structural tubes are disclosed, which each include inner and outer tube members, and plural supporting portions integrating the outer and inner tube members. One end of the outer tube member only is sealed. A process for producing such tubes is also disclosed, which includes the steps of extruding a green ceramic double wall-structural tube comprising inner and outer tube members, and a plurality of supporting portions integrating the outer and inner tube members; drying the green ceramic tube; grinding off the inner tube member and the supporting portions in a given depth from an end face of the dried tube, inserting a porous member made of an organic material into the ground-off portion of the tube inside the outer tube member; pouring and depositing a slurry into the tube on an axially outer side of the porous member; and drying and firing the thus one end-sealed ceramic tube. The porous member is shaped to meet an inner periphery of an end portion of the tube to be sealed, and the coefficient of thermal expansion of the slurry is the same as that of the ceramic tube during firing.