(70ca) Preparation and Characterization of Ceramic Porous Filter Using Pottery Raw Materials

Foam ceramics present closed-pore and open-pore network structure. These porous network structures have relatively low mass, low density, and low thermal conductivity, and the open-pore network having the higher permeability. By combining the proper ceramic materials and processing, porous ceramics can also exhibit relatively high strength, high resistance to chemical attack, high temperature resistance, high porosity and uniform pore structure. Foam ceramics are highly versatile porous materials which are used primarily in applications where fluid transport in the microstructure is required. These include molten metal filtration, gas permeation, catalyst supports, as well as the novel applications in the thermal insulation, aerospace, electronics, biomedical and pollution treatments. In present work, we will show our primary results using the sponge impregnation method to prepare porous ceramic fillers using Chinese pottery raw materials. The raw materials powders (Pumice,Bentonite et al) were dispersed into water to prepare first the slurry with solid content of 50~55wt% The template sponge was dipped into the slurry and the green body was dried at 80°C for 10 h and sintered at 1200-1300°C.The microstructure, densification process, phase evolution, mechanical properties and especially the effects of introducing nanosized powder were characterized by XRD, SEM, TG-DTA, sedimentation density, porosity, shrinkage and compassion strength measurements. The Open cell diameter could be tailored by changing the sponge in the range of <3mm and the compassion strength being around 100MPa (Open cell diameter: 2 mm).