Porous ceramic materials based on a coarse Al2O3 filler were synthesized using fine MgO, SiO2, and SiC binders by compaction at pressures of 20…40 MPa followed by sintering in the temperature range of 1100…1300 °C. It was established that at 1100 °C a weakly consolidated structure is formed, whereas at 1200 °C and above liquid-phase sintering occurs, leading to strengthening of the ceramic framework. The formation of the pore structure is completed at 1300 °C. An increase in the sintering temperature from 1100 to 1300 °C results in more than a threefold increase in flexural strength, while an increase in the compaction pressure from 20 to 40 MPa provides a twofold strengthening effect while maintaining high porosity, gas permeability, and structural homogeneity. The obtained results demonstrate the possibility of targeted control of the structural and functional properties of porous ceramics through optimization of synthesis parameters. This work shows potential for the cost-effective production of Al2O3-based membranes for microfiltration processes, as well as catalyst supports for operation under aggressive environments and high thermal loads.
Roman D. Kapustin – PhD(Tech.), senior researcher, Merzhanov Institute of Structural Macrokinetics and Materials Science, Russian Academy of Sciences, Chernogolovka, Moscow region, Russia
Andrey O. Kirillov – PhD(Tech.), junior researcher, Merzhanov Institute of Structural Macrokinetics and Materials Science, Russian Academy of Sciences, Chernogolovka, Moscow region, Russia
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