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RSS FeedsMaterials, Vol. 11, Pages 2545: Extension of the `Inorganic Gel Casting` Process to the Manufacturing of Boro-Alumino-Silicate Glass Foams (Materials)

 
 

14 december 2018 18:00:24

 
Materials, Vol. 11, Pages 2545: Extension of the `Inorganic Gel Casting` Process to the Manufacturing of Boro-Alumino-Silicate Glass Foams (Materials)
 




A new technique for the production of glass foams, based on alkali activation and gel casting, previously applied to soda-lime glass, was successfully extended to boro-alumino-silicate glass, recovered from the recycling of pharmaceutical vials. A weak alkali activation (2.5 M NaOH or NaOH/KOH aqueous solutions) of fine glass powders (below 70 µm) allowed for the obtainment of well-dispersed concentrated aqueous suspensions, undergoing gelation by treatment at low temperature (75 °C). Unlike soda-lime glass, the progressive hardening could not be attributed to the formation of calcium-rich silicate hydrates. The gelation was provided considering the chemical formulation of pharmaceutical glass (CaO-free) to the formation of hydrated sodium alumino-silicate (N-A-S-H) gel. An extensive direct foaming was achieved by vigorous mechanical stirring of partially gelified suspensions, comprising also a surfactant. A sintering treatment at 700 °C, was finally applied to stabilize the cellular structures.


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29 viewsCategory: Chemistry, Physics
 
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