A technology for producing nanoporous ceramics based on mullite (3Al2O3 ⋅ 2SiO2) is developed. The mechanochemical activation of oxides involved in the synthesis of mullite (γ-Al2O3 and amorphous SiO2) makes it possible to obtain single-phase 3Al2O3 ⋅ 2SiO2 and to reduce its sintering temperature to 1300°С. The effect of the pressing pressure and the amount of pore-forming additive (ammonium carbonate) on the value of open porosity, pore volume, and pore size distribution in sintered ceramics 3Al2O3 ⋅ 2SiO2 is established. Mullite nanoceramics with open porosity of 42–47%, pore size <200 nm, and compressive strength 50–65 MPa is obtained.
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The author thanks Doctor of Chemistry A.E. Lapshin for the X-ray phase analysis and Candidate of Chemical Sciences E.A. Vasil’eva for her help in discussing the mercury porosimetry data.
The work was carried out as part of the research project “Inorganic synthesis and research of ceramic and organoinorganic composite materials and coatings.”
State registration number (CIT and C): АААА-А19-119022290091-8.
The authors declare to have no conflict of interest.
Translated by Sh. Galyaltdinov
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Morozova, L.V. Production Conditions of Nanoporous Ceramics Based on Mullite. Glass Phys Chem 46, 570–575 (2020). https://doi.org/10.1134/S1087659620060152
- mechanochemical activation
- open porosity
- pore size distribution