Indirect solid freeform fabrication by binder assisted slip casting

Effect of particle size on the shaping of ceramics by slip casting

“…After slip casting the slurries, the green density was higher (67% of theoretical value) for the suspension that reached the lower viscosity value (0.2% of PAA). Lindqvist et al 30 prepared alumina suspensions of 50 vol.% with different latex content as a binder for solid freeform fabrication, reaching values of 63-64%TD for additions of latex of 0-1 wt.% that produces viscosities around 0.1 Pa s at 800 s −1 .…”

“…Another method to retain fine grain size is the dual sintering and combined microwave with conventional heating. 1 According to some authors, 21,29,30 the effect of viscosity and green density is not so strong on the sintering behaviour, being the temperature of sintering the major role for developing materials with density values close to the theoretical one, so different temperature for sintering were considered in this work. The microstructures of bodies corresponding to 190 nm particles and LV suspensions treated at different sintering temperatures are shown in Fig.…”

Processing Routes to Macroporous Ceramics: A Review

“…108,142,143 In all of these processes, the continuous matrix phase has to be partially consolidated before removal of the sacrificial material, so that the porous structure does not collapse during the extraction step. When the continuous phase is a suspension of colloidal ceramic particles, consolidation is usually achieved with the help of setting agents and binders 146 or through the formation of a stiff attractive network of particles throughout the matrix. 88,109,136 Alternatively, sol-gel transitions based on the condensation of metal alkoxide and hydroxides in solution has also been used to consolidate the continuous phase.…”

“…146 Pores with special morphologies have also been produced by a freeze casting approach using water or a high-melting point oil as sacrificial material. By tuning the growth of ice/oil crystals during the unidirectional freezing of suspensions, dendritic or highly oriented porous structures has been obtained after sublimation of the templating crystals (Fig.…”

Rapid fabrication of alumina-based ceramic cores for gas turbine blades by stereolithography and gelcasting

“…The die parting face and demoulding step were eliminated, so it is possible to obtain very complicated components within the resin mold (Lindqvist and Carlström, 2005).…”