About this Abstract |
Meeting |
MS&T24: Materials Science & Technology
|
Symposium
|
Engineering Ceramics: Microstructure-Property-Performance Relations and Applications
|
Presentation Title |
Spray Freeze Granulation Drying of Nonaqueous Slurry to Fabricate High Strength Silicon Nitride Ceramics |
Author(s) |
Junichi Tatami, Riko Yamazaki, Motoyuki Iijima, Shinya Kawaguchi, Naoki Kondo |
On-Site Speaker (Planned) |
Junichi Tatami |
Abstract Scope |
Spray freeze granulation drying was carried out using nonaqueous slurry to obtain granules for improvement in the bending strength of silicon nitride ceramics. Solvent mixtures of tert-butyl alcohol and cyclohexane were used to prepare the Si3N4 slurries. As a result of in situ observation of the freezing behavior of the slurry, it was found that the solvent mixture of the eutectic composition yielded a homogeneous internal structure with fine pores in the freeze-dried body. The granules of that composition prepared by spray freeze granulation drying had a smaller size and a narrower size distribution, which resulted in a homogeneous internal structure of silicon nitride ceramics. The internal structure and flowability of the granules improved with an increase in the amount of OA in the PEI-OA complex added as a dispersant, resulting in an increase in the density of the molded and sintered bodies and higher strength of the Si3N4 ceramics. |