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Preparation and characterization of calcium hexaaluminate (CA6) porous ceramic for application in high-temperature flue gas filtration

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The purpose of this work was to provide a feasible gel-casting method to develop a high-performance porous ceramic for high-temperature flue gas filtration. The calcium hexaaluminate (CA6) porous ceramics were fabricated by an aqueous gel-casting process using CaCO3 and ρ-Al2O3 powders as raw materials. The properties of CA6 porous ceramics in terms of microstructural characteristics, phase composition, pore size distribution, open porosity, compressive strength, thermal conductivity, and air permeability have been investigated. The results indicated that completely developed lamellar CA6 grains can form a stepped structure and an irregular structure due to enough growth space, which could significantly improve the properties of the CA6 porous ceramics. The CA6 samples showed a high open porosity of 68.1% at a low thermal conductivity of 0.48 W/(m/K). In particular, the CA6 samples possess high compressive strength of 7.9–62.0 MPa and high air permeability of 5.19 × 10−7 m2–2.01 × 10−6 m2 (Darcy permeability, k1). Based on these good properties, the CA6 porous ceramic could resist the impact of gas and reduce heat loss in flue gas in high-temperature environment, which indicated that it could be appropriative for applications of high-temperature flue gas filtration.

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This work was financially supported by the National Natural Science Foundation of China (No. 51974074, No. 51874083, No. 52074070) and the State Key Program of the National Natural Science Foundation of China (No. 51932008).

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Correspondence to Zhengguo Yan or Endong Jin.

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Yuan, L., Yao, X., Yan, Z. et al. Preparation and characterization of calcium hexaaluminate (CA6) porous ceramic for application in high-temperature flue gas filtration. J Aust Ceram Soc 58, 1701–1708 (2022).

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