空孔量を制御した多孔性コーディエライトセラミックスのプロセシング

Abstract

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.

Lightweight cordierite–mullite refractories with low coefficients of thermal conductivity and high mechanical properties

“…2 Cordierite(2MgO•2Al 2 O 3 •5SiO 2 ) possesses a low thermalexpansion coefficient, an excellent thermal-shock resistance and chemical stability at elevated temperatures, and then the porous cordierite ceramics have attracted more attention. [3][4][5][6] However, the porous cordierite ceramics are not suitable for the working lining of furnaces, because (1) the homogeneous microstructure of porous ceramics is harmful to the thermal-shock resistance; (2) the mechanical properties of cordierite material are poor. Mullite (3Al 2 O 3 •2SiO 2 ) has a low thermal-expansion coefficient and a good thermal-shock resistance as well as an excellent mechanical properties and a chemical stability.…”

Processing of polysiloxane-derived porous ceramics: a review

“…• C for 10 h [109,110]. A typical microstructure of porous cordierite ceramics obtained using 23.5% polysiloxane, 32.7% talc, 26.3% Al 2 O 3 , 2.5% kaolin and 15% expandable microsphere is shown in figure 5(B).…”

“…The porosity could be controlled in the range of 60-75% by manipulating the packing density. A wider range of porosity of 11-72% could be obtained by adjusting the template content, sintering temperature and the sintering additive composition [110]. A compressive strength of ∼150 MPa was recorded at 35% porosity when 6 wt% kaolin was added as the sintering additive.…”