Abstract
High-purity calcium hexaluminate (CA 6 ) porous ceramics have been prepared with novel pectin based gelcasting freeze-drying method. CaCO 3 and Al 2 O 3 were used as raw materials and ficus pumila pectin was used as gelling agent. Effects of solid content on properties of CA 6 porous ceramics, such as phase composition, microstructural characteristics, apparent porosity, bulk density, compressive strength, and thermal conductivity have been investigated. Pores in CA 6 ceramics are found to be mainly formed by water molecules sublimation during freeze-drying and organic decomposition processes. Moreover, freeze-drying method is shown to be beneficial to improve heat insulation performance of porous ceramics. As-prepared CA 6 porous ceramics with different solid contents possess high apparent porosity of 66.4-75.1%, low bulk density of 0.90-1.20 g/cm 3 , low thermal conductivity of 0.227-0.360 W/(mK), and relatively high compressive strength of 0.71-2.06 MPa, which fully meet requirements for their functional and structural applications.
Published Version
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