Abstract
Cordierite foams were prepared by thermo-foaming of alumina–microsilica–talc powder dispersions in molten D-glucose anhydrous followed by reaction sintering at 1400 °C, which exhibited an interconnected cellular morphology and three-dimensional porous cell walls. The cordierite foam had a porosity of up to 96%, and its corresponding thermal conductivity was as low as 0.057 W/(m·K). The foam structures showed a great promise for gas filtration and gas catalytic support. The formation of interconnected cellular morphology, the variations of cell wall thickness, and cell size were explained from the perspective of viscosity and weak points in this paper. The linear shrinkage of cordierite foams having a density of 0.102–0.226 g/cm3 was in the range of 13.0–6.9%. And the compressive strength (0.05–0.28 MPa) was determined by the large cell size (1.1–1.3 mm), ultra-high porosity (91–96%), and characteristic of cordierite.
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This work was supported by the National Natural Science Foundation of China (Grant Nos. 51772221 and 51502213) and the Key Program of Natural Science Foundation of Hubei Province of China (Grant No. 2017CFA004).
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Li, X., Li, Y., Xiang, R. et al. Fabrication of ultra-high-porosity cordierite foams by the thermo-foaming of powder dispersions in molten D-glucose anhydrous. Journal of Materials Research 34, 1818–1825 (2019). https://doi.org/10.1557/jmr.2019.13
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DOI: https://doi.org/10.1557/jmr.2019.13