抄録
Vacuum-pressure assisted slip casting of low soda alumina powder was studied to fabricate alumina engineering ceramic parts with a complicated shape. A well-dispersed low soda alumina slurry (82wt% solids) was prepared by adding 0.15wt% polymer deflocculant (polycarboxylic ammonium), 0.3wt% binder (D-solbitol) and O.1wt% defoamer (ethylene glycol). The consolidation kinetics of the slurry using the vacuum-pressure assisted slip casting system with a porous polymer resin mold and the mechanical properties of the sintered body were investigated. The rate of filter cake buildup (k) was experimentally determined to be 1.26x10-13P[m2/s]. The sintered body of low soda alumina showed a high density of 3.94g/cm3 and a high flexural strength of about 500MPa. It was found that the vacuum-pressure assisted slip casing was a useful forming method of low soda alumina.
