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Porous cordierite ceramics with controlled porosity were fabricated via a reaction sintering using expandable microspheres as sacrificial templates and ceramics-filled polysiloxane as a precursor for cordierite ceramics. The influence of the sintering temperature, the template content, and the additive composition on the microstructure, porosity, and compressive strength has been investigated. The results showed that the template content, the sintering temperature, and the sintering additive composition have a significant effect on the porosity. By controlling the template content, the sintering temperature, and the sintering additive composition, it was possible to produce porous cordierite ceramics possessing a wide range of porosities ranging from 11! to 72!. The compressive strength was influenced by both the porosity and the additive composition. The compressive strength of the porous cordierite ceramics containing 6 mass! kaolin as a sintering additive was Ĭ150 MPa at 35! porosity.

A new processing route for the manufacture of cellular glasses has been developed. The strategy adopted for making the cellular glasses entails the following steps: (i) fabricating a formed body by combining glass powder and glass microspheres, and (ii) sintering the formed body. By controlling the sintering temperature and the microsphere content, it was possible to adjust the porosity so that it ranged from B42% to B62%. The compressive strengths of the cellular glasses with B42% and B60% porosities were B150 and B60 MPa, respectively. The superior compressive strengths were attributed to the homogeneous distribution of small (r35 lm), spherical cells with dense struts in the cellular glasses. J ournal