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Abstract: Porous calcium hexaluminate (CaAl 12O 19 or CA 6) is a promising refractory material for thermal insulation applications because it combines low thermal conductivity (0.1-0.5 W∙(m∙K) -1 at 1200-1400 °C), suitable mechanical strength (1-10 MPa, uniaxial compression), chemical inertia, good refractoriness (melting temperature of 1830 °C), high resistance to thermal shock, and straightforward processing conditions. There are several routes to obtaining porous CA 6-based materials, using alternative sources of Al 2O 3 and CaO, as well as different processing methods, generating structures of distinct levels of total porosity, mechanical properties, and pore-size distribution. This paper represents a critical review of the technical and scientific literature on CA 6 with emphasis on the production of porous materials and on the conditions required to attain optimized microstructure and properties for thermal insulation at high temperatures. ...
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- Microstructure Development in Porous Calcium Hexaluminate and Application as a High-Temperature Thermal Insulator: A Critical Review
- Publication date
- Springer Fachmedien Wiesbaden
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