Densification behavior of freeze-casted alumina with grain boundary segregation of impurities

Densification behavior and attrition resistance of porous Al2O3beads prepared by dripping‐ice templating

“…22,23 However, only guaranteeing sufficient mechanical strength could give full play to porous ceramics advantages. 24 For porous ceramics, sintering is an essential process to produce a coherent body with sufficient mechanical strength from rather fragile green bodies. During the sintering process, the densification behavior of freeze-casted porous scaffolds occurred in the lamellar walls.…”

“…During the sintering process, the densification behavior of freeze-casted porous scaffolds occurred in the lamellar walls. 24,25 Based on the particle redistribution and concentration behavior during the freezing process, pores in the green body can be categorized into two types: intrinsic pores in the walls, corresponding to the interparticle spaces due to the packing particles in the lamellar walls, and extrinsic pores between the pore walls, corresponding to the pure ice crystals. 26 The intrinsic pores in the walls are removed during the sintering process, resulting in the densification of pore walls.…”

“…However, only guaranteeing sufficient mechanical strength could give full play to porous ceramics advantages 24 . For porous ceramics, sintering is an essential process to produce a coherent body with sufficient mechanical strength from rather fragile green bodies.…”

“…For porous ceramics, sintering is an essential process to produce a coherent body with sufficient mechanical strength from rather fragile green bodies. During the sintering process, the densification behavior of freeze‐casted porous scaffolds occurred in the lamellar walls 24,25 . Based on the particle redistribution and concentration behavior during the freezing process, pores in the green body can be categorized into two types: intrinsic pores in the walls, corresponding to the interparticle spaces due to the packing particles in the lamellar walls, and extrinsic pores between the pore walls, corresponding to the pure ice crystals 26 .…”

Simultaneous control of mechanical strength and hierarchical structure in freeze‐casted porous alumina by two‐step sintering

“…However, to the best of our knowledge, only a few works have dealt with the sintering process in relation to other freeze-casting research, as pointed out in earlier work. 34 Recently, Coble's densification model was adopted to analyze the densification behaviors of a lamellar wall structure in a freeze-casted porous Al 2 O 3 system. 34 Although this model is limited to a thick lamellar wall structure providing a grain structure similar to that of a bulk system, it shed light on possible applications of classical bulk theory to freeze-casted porous structures.…”