Development of Reticulated Porous Ceramics by Two-step Centrifuging Processing

Silicon nitride reticulated porous ceramics with controlled structure were fabricated by a two-step centrifuging processing, using polyurethane sponge as the template. According to the TG-DSC analysis of the template, the pyrolysis schedule was decided. Effects of centrifuging processing and viscosity on the loading content of slurry on the sponge and macrostructure of porous ceramics were studied. The structure and bond strength of the reticulated porous ceramics were also reported. Compared with the roll-press processing, the reticulated porous ceramics fabricated by the two-step centrifuging processing have higher slurry loading, more uniform structure and higher bending strength.