Journal
COMPOSITES PART B-ENGINEERING
Volume 137, Issue -, Pages 23-30Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.compositesb.2017.11.013
Keywords
Foams; Physical properties; Microstructures; Geopolymer
Funding
- China Scholarship Council (CSC) [201407565009]
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Hierarchically porous SiC-geopolymer foams were synthesized by using geopolymerization, which is a low temperature method (75 degrees C) that allows to replace the high temperature treatment process. The porosity was developed by a novel saponification/peroxide combined route, with H2O2 and olive oil used as foaming agents. The in-situ formation of the water-soluble soap and glycerol molecules generated by the saponification reaction and the decomposition of hydrogen peroxide enabled to obtain a large volume of interconnected macro-porosity. The reaction bonding behavior, phase composition, porosity characteristics, microstructure and mechanical strength of porous SiC-geopolymer ceramics were investigated. The combination of peroxide and oil enabled the production of open celled SiC-geopolymer composite foams in a rather large range of total porosity and strength values, with an optimal sample possessing a total porosity of up to similar to 84 vol%, an open porosity of similar to 83 vol%, a thermal conductivity of 0.15 W/mK, and a compression strength of similar to 1.1 MPa.
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