Production of ceramic glass foam of low thermal conductivity by a simple method entirely from fly ash

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dc.contributor.authorCengizler H.
dc.contributor.authorKoç M.
dc.contributor.authorŞan O.
dc.date.accessioned2024-07-22T08:05:21Z
dc.date.available2024-07-22T08:05:21Z
dc.date.issued2021
dc.description.abstractCeramic glass foam/foams (CGF) from two different F-class fly ashes were produced via a well-known simple conventional sintering method using sodium silicate (Na2SiO3) as a foaming and fluxing agent. The research aimed to understand the effects of each fly ash, Na2SiO3 ratio, and sintering conditions on the properties and microstructure to produce a commercial CGF of low thermal conductivity. The chemical composition of fly ash from the thermal power plants of Tunçbilek and Seyitömer were quite similar but had different melting temperatures and microstructures. While the foam structure was successfully obtained at 1100 °C with 30 wt.% Na2SiO3 from Tunçbilek fly ash, a similar structure was obtained at 1150 °C from the Seyitömer fly ash. The effects of Na2SiO3 content and sintering temperature on the properties and microstructure of the CGF from the Tunçbilek fly ash of a lower melting point, in particular, were investigated systematically. The optimal sintering temperatures were determined to be 1200, 1150, and 1100 °C at the highest fly ash ratios of 90, 80 and 70 wt.%, respectively. The CGF were produced with 69.76–75.43% porosity, 0.55–0.69 gr/cm3 bulk density, 3.2–5.35 MPa compressive strength and 0.10–0.21 W/(m K) of low thermal conductivity. XRD results showed that optimal CGF samples mainly contained spinel, quartz and hematite crystal phases and amorphous phase. In this research, a thermal insulation material was successfully produced using an industrial waste completely with a well-known simple method. It is thought that this will contribute beneficially to the environment and the economy. © 2021 Elsevier Ltd and Techna Group S.r.l.
dc.identifier.DOI-ID10.1016/j.ceramint.2021.06.265
dc.identifier.issn02728842
dc.identifier.urihttp://akademikarsiv.cbu.edu.tr:4000/handle/123456789/13094
dc.language.isoEnglish
dc.publisherElsevier Ltd
dc.subjectCompressive strength
dc.subjectGlass
dc.subjectHematite
dc.subjectIndustrial research
dc.subjectMicrostructure
dc.subjectSilicates
dc.subjectSintering
dc.subjectSodium compounds
dc.subjectThermal conductivity
dc.subjectThermal insulation
dc.subjectThermoelectric power plants
dc.subjectCeramic glass
dc.subjectCeramic glass foam
dc.subjectConventional sintering
dc.subjectGlass foams
dc.subjectLow thermal conductivity
dc.subjectProperties and microstructures
dc.subjectSIMPLE method
dc.subjectSimple++
dc.subjectSintering temperatures
dc.subjectSodium silicate
dc.subjectFly ash
dc.titleProduction of ceramic glass foam of low thermal conductivity by a simple method entirely from fly ash
dc.typeArticle

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