Journal
JOURNAL OF THE AMERICAN CERAMIC SOCIETY
Volume 103, Issue 9, Pages 4957-4968Publisher
WILEY
DOI: 10.1111/jace.17166
Keywords
celsian ceramics; geopolymers; ion-exchange; porous materials
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Funding
- National Natural Science Foundation of China [51872063, 51832002, 51621091]
- Natural Science Foundation of Heilongjiang Province [YQ2019E002]
- National Key Research and Development Program of China [2017YFB0703200]
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In this paper, monoclinic SrAl2Si2O8 ceramics with porous structures were prepared based on ion-exchanged geopolymer precursor technique. Micron-level pores with a homogeneous pore-size distribution were introduced into the inorganic framework using foaming agents. The results demonstrated that the apparent density, pore-size distribution and specific surface area of porous geopolymer precursors can be well-engineered via tailoring the category and concentration of the foaming agent. After being treated at 900 degrees C, hexagonal SrAl2Si2O8 first-crystallized from the amorphous geopolymer matrix and then gradually converted into monoclinic SrAl2Si2O8 between 1100 degrees C and 1200 degrees C. The resulting monoclinic SrAl2Si2O8 ceramics maintained the porous structures during high-temperature treatments and exhibited high porosity, specific surface area, and compressive strength. The aforementioned strategy not only achieves monoclinic SrAl2Si2O8 ceramics with well-defined and robust microstructures, but also provides an alternative route to prepare other porous ceramics, with potential applications in fields of high-temperature filters, adsorbents, and heterogeneous catalysis.
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