Fig. 1 Schematic diagram of ceramic particles solidified by three-dimensional organic network (a) and photo of translucent Al2O3 sheet (100 mm × 100 mm × 1 mm) (b)

Fig. 2 Simplified structure of PIBM molecule (a) and schematic diagrams of organic network with low and high density by spontaneous coagulation casting (b) and gelcasting (c), respectively

Fig. 3 Effect of TMAH content on the rheology of alumina slurry (a), and effect of slurry solid content on drying and sintering shrinkage (b)[43]

Fig. 4 Effect of hydrophobic groups on spontaneous coagulation (a) Hydrophobic modification reaction; (b) Schematic diagram of ceramic particle dispersion and hydrophobic association curing mechanism

Fig. 5 Zeta potential (a), viscosity (b), and storage modulus (c) of alumina slurry prepared by introducing different hydrophobic chains[47]

Fig. 6 Effect of TMAC on viscosity (a) and storage modulus (b) of alumina slurry prepared by adding PAA and CE-64[47]

Fig. 7 Schematic diagram of stabilized foam with hydrophobized ceramic particles (a) and corresponding magnification part (showing a modified dispersant on a particle) (b)

Fig. 8 Pictures of wet green bodies before (a) and after (b) joining, and effect of syneresis time on flexural strength of sintered samples (1600 ℃×2 h) derived from wet green bodies (c) [54]

Fig. 9 Linear shrinkage (a) and bulk density distribution (b) of the gelled and pressure-filtrated samples after drying[55]

Fig. 10 Density difference of ceramic green bodies prepared by different dispersion systems (a) and photos of sintered samples (280 mm×130 mm×20 mm)(b)[56]

Fig. 11 Drying curves of wet bodies under different pressures (a) and in-line transmittance of corresponding ceramics (1 mm thick) (b)[57]

Fig. 12 Schematic diagram of orientation of the platelet under shear flow (a), surface of the green body with platelet (b), XRD patterns of the green bodies sintered at different temperatures (c), and the influence of the content and type of the platelet on the linear transmittance of the ceramic (1 mm thick) (d)[61]

Fig. 13 Closed-cell alumina foam ceramics prepared by hydrophobized ceramic particles (a) Coarse-grained[65]; (b) Fine-grained[67]

Fig. 14 Photo of alumina disc with a diameter of ϕ 1010 mm

Fig. 15 Pictures of alumina dome (a) and guide (b), and AlN ceramic hat sink (c) prepared by spontaneous coagulation casting