FABRICATION OF POROUS CERAMICS WITH CYLINDRICAL PORES AND INCORPORATING PORES BY UNIDIRECTIONAL SOLIDIFICATION PROCESS

摘要

In this paper, a fabrication process of porous ceramics with cylindrical pores and incorporating pores was discussed. The cylindrical pores were formed during the unidirectional solidification of aqueous slurry containing CO2 gas under reduced pressure and a composite of ice and ceramics powder was obtained. An incorporating porous structure consisted of ceramic powder was obtained by vacuum freeze drying process. The porous green body with cylindrical pores and incorporating pores was sintered at 1250°C for 5 hours. The porosity and pore size was well controlled by me pressure during the solidification and sintering temperature and time.