Abstract
A porous ceramics with cylindrical pores and incorporating pores were fabricated through unidirectional solidification of aqueous ceramics powder slurry containing CO2 gas, vacuum freeze drying and sintering process. The cylindrical pores were formed during the unidirectional solidification under reduced pressure and a composite of ice and ceramics powder was obtained. Since the composite was formed by segregation of ice during the solidification, an incorporating structure of ice was obtained. The ice was removed by vacuum freeze drying method. 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 the pressure during the solidification and sintering temperature and time.
