Naoki Kondo1, Akihiro Shimamura, Mikinori Hotta, Junichi Tatami and Shinya Kawaguchi
Abstract
Spray drying (SD) and spray freeze granulation drying (SFGD) are the granulation processes of ceramic powder. Alumina green body made from SFGD granules via compaction has a relatively uniform structure without inter-granular pores, resulting in higher density and strength in the sintered body. This gives SFGD granules an advantage over SD granules. This study investigates the compaction pressure and sintering temperature of alumina granules produced by SD and SFGD. Using SFGD granules allows for the production of dense highstrength sintered alumina at lower compaction pressures and sintering temperatures. Even with higher compaction pressures applied to SD granules, the achieved sintered density falls short of that obtained with SFGD granules. These findings highlight the additional benefits of using SFGD granules over SD granules.
Keywords:
Spray drying, spray freeze granulation drying, alumina granule, Compaction pressure, Sintering temperature, Sintered density, Strength