Reparation and properties of porous ceramics via re-coating technique
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Via a polymeric foam replication and two-step route (heating and re-coating), the reticulate porous ceramics (RPCs) were fabricated. The coating slurries were made up mainly by the ceramic powder (major raw material) and silica sol (binder). The re-coating slurries were obtained by mixing the pore-forming raw material with dilute coating slurries. The effect of the solidcontents on the re-coating rate (Pr) and the porosity (θs) was investigated. The experimental results indicate that the Pr is increasing and the θs is decreasing gradually following the increase of solid-contents. The specific surface area and the pore size distribution of the sintered bodies were measured by intrusive mercury curve. Morphological characteristics of the sintered bodies were investigated by the scanning electron microscopy (SEM). The results illustrated that the pore diameter were all quite spread and the effective specific surface areas for the samples G-4, S-4 and D-4 RPCs are 0.36 m2 /g, 0.52 m2 / g and 1.63 m2 /g, respectively.
Abstract
Via a polymeric foam replication and two-step route (heating and re-coating), the reticulate porous ceramics (RPCs) were fabricated. The coating slurries were made up mainly by the ceramic powder (major raw material) and silica sol (binder). The re-coating slurries were obtained by mixing the pore-forming raw material with dilute coating slurries. The effect of the solidcontents on the re-coating rate (Pr) and the porosity (θs) was investigated. The experimental results indicate that the Pr is increasing and the θs is decreasing gradually following the increase of solid-contents. The specific surface area and the pore size distribution of the sintered bodies were measured by intrusive mercury curve. Morphological characteristics of the sintered bodies were investigated by the scanning electron microscopy (SEM). The results illustrated that the pore diameter were all quite spread and the effective specific surface areas for the samples G-4, S-4 and D-4 RPCs are 0.36 m2 /g, 0.52 m2 / g and 1.63 m2 /g, respectively.
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