Synthesis of β-SiAlON Porous Ceramics by Filtrational Combustion of Reactive Foams in Nitrogen Flow

Abstract:

Process of synthesis of porous ceramics via organization of the filtrational mode of combustion synthesis in reactive samples preliminary structured by the method of foaming of slurry is investigated. The Al + SiO₂ + N₂ system is investigated; the target product of synthesis is β-SiAlON. It is demonstrated that high-porosity ceramic materials inheriting initial structure of the porous space of reactive systems can be fabricated in the filtrational mode of combustion synthesis. This has allowed us to vary the pore space parameters in wide ranges. The β-SiAlON based ceramic materials with total porosity from 40 to 75%, sizes of core elements 250–750 μm, sizes of porous channels 10–200 μm, and specific surface 4–15 mm^-1 have been fabricated. It is demonstrated that combustion in reactive gas flow considerably intensifies the process of combustion synthesis.

• Periodical: Advanced Materials Research (Volume 1040)
• Pages: 418-422
• DOI: https://doi.org/10.4028/www.scientific.net/AMR.1040.418
• Online since: September 2014
• Authors: A.S. Maznoy*, Alexander Kirdyashkin, Ramil Gabbasov
• Keywords: Combustion Synthesis, Filtrational Combustion, Porous Ceramic, Self-Propagating Combustion Synthesis, SiAlON

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