Fabrication of porous alumina ceramics by simultaneous thermal gas generating and thermal slurry solidification

抄録

In this study, porous alumina green bodies were formed from alumina slurries by simultaneous thermal gas generating and thermal slurry solidification. In order to cause simultaneous thermal gas generating and thermal slurry solidification, NH₄HCO₃ and potato starch were used as a gas generating agent and a gelatinizing agent, respectively. Alumina slurries containing NH₄HCO₃ and potato starch were heated in the 80°C oven, so that porous alumina green bodies were formed. With increasing the amount of NH₄HCO₃, the visible pore size of the porous alumina block and the number of visible pores in the alumina block increased. Additionally, the alumina slurry containing NH₄HCO₃ and potato starch was unidirectionally heated from the bottom side, so that a platy alumina green body with a number of through-holes was formed.