There is some relevant literature on making glass foams from waste cullet using Na2SiO3 as a foaming agent. Besides, ceramic glass foams can also be produced from F class fly ash with the aid of a fluxing agent such as boron minerals. Although I have found discussions about the mechanisms of foaming in the production of ceramic glass foams from various wastes using a number of different foaming agents such as Al, SiC, CaSO4, carbonates, and so on, I could not find an explanation about the Na2SiO3 foaming mechanism. I would appreciate if you could enlighten me about this subject. Many thanks...
Reducing gases, such as CO or H2, may react with quartz (SiO2) to form a gas called silicon monoxide (SiO). Probably, while the Na2SiO3 is being melted in the furnace, the presence of CO or H2 in the furnace's atmosphere may decompose the silicate compound, and SiO could be formed as phase gas, which, in turn, would help the foaming of the glassy matrix.
Sir, thank you very much for your answer. Is there any kind of related reference you can recommend on this subject?
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