Nepheline porous ceramics with improved strength and well thermal insulation performance were synthesised at 850–1000°C by a foam-gelcasting technology, using waste zeolite powders, triethanolamine lauryl sulphate and xanthan gum respectively as the starting materials, foaming agent and gelling agent. The effect of sintering temperatures and solid contents on the physical and thermal properties of final samples were investigated. The strengths of foams increased with the firing temperatures and solid levels, and the sample possessing the porosity of 71.9% exhibited the highest compressive strength of 2.9 MPa 1, respectively. Moreover, the one with a solid content of 20 wt-% and fired at 950°C containing 76.9% porosity and having compressive strengths respectively of 1.8 MPa showed the lowest thermal conductivity of 0.10 W/(m oC) at 25°C, suggesting that as-prepared porous ceramics could be potentially used as a good thermal insulation material.
SadineniSB, MadalaS, BoehmRF.Passive building energy savings: a review of building envelope components. Renew Sust Energ Rev. 2011;15:3617–3631. doi: 10.1016/j.rser.2011.07.014
2.
VatalisKI, LaaksonenA, CharalampidesG, Intermediate technologies towards low-carbon economy. The Greek zeolite CCS outlook into the EU commitments. Renew Sust Energ Rev. 2012;16:3391–3400. doi: 10.1016/j.rser.2012.02.031
3.
SchiavoniS, BianchiF, AsdrubaliF.Insulation materials for the building sector: a review and comparative analysis. Renew Sust Energ Rev. 2016;62:988–1011. doi: 10.1016/j.rser.2016.05.045
4.
JiR, ZhangZ, HeY, Synthesis, characterization and modeling of new building insulation material using ceramic polishing waste residue. Constr Build Mater. 2015;85:119–126. doi: 10.1016/j.conbuildmat.2015.03.089
5.
HanL, LiF, YaoX, Fabrication of porous MgAl2O4 ceramics using V2O5 as sintering additive. Ceram Int. 2020;46:22819–22825. doi: 10.1016/j.ceramint.2020.06.049
6.
RincónA, GiacomelloG, PasettoM, Novel ‘inorganic gel casting'process for the manufacturing of glass foams. J Eur Ceram Soc. 2017;37:2227–2234. doi: 10.1016/j.jeurceramsoc.2017.01.012
7.
FernandesH, TulyaganovD, FerreiraJ.Production and characterisation of glass ceramic foams from recycled raw materials. Adv Appl Ceram. 2009;108:9–13. doi: 10.1179/174367509X344971
8.
WuJ, BoccacciniA, LeeP, Glass ceramic foams from coal ash and waste glass: production and characterisation. Adv Appl Ceram. 2006;105:32–39. doi: 10.1179/174367606X81632
9.
MurashovVV, WhiteMA.Thermal properties of zeolites: effective thermal conductivity of dehydrated powdered zeolite 4A. Mater Chem Phys. 2002;75:178–180. doi: 10.1016/S0254-0584(02)00051-2
10.
WangL, HanC, NadagoudaMN, An innovative zinc oxide-coated zeolite adsorbent for removal of humic acid. J Hazard Mater. 2016;313:283–290. doi: 10.1016/j.jhazmat.2016.03.070
11.
HanL, LiF, DengX, Foam-gelcasting preparation, microstructure and thermal insulation performance of porous diatomite ceramics with hierarchical pore structures. J Eur Ceram Soc. 2017;37:2717–2725. doi: 10.1016/j.jeurceramsoc.2017.02.032
12.
HanL, LiF, ZhangH, Freeze-drying preparation of porous diatomite ceramics with high porosity and low thermal conductivity. Adv Appl Ceram. 2020;119:195–203. doi: 10.1080/17436753.2020.1732622
13.
HanL, LiF, ZhangH, Low-temperature preparation of porous diatomite ceramics via direct-gelcasting using melamine and boric acid as cross-linker and sintering agent. Ceram Int. 2019;45:24469–24473. doi: 10.1016/j.ceramint.2019.08.172
14.
HanL, WangJ, LiF, Low-temperature preparation of Si3N4 whiskers bonded/reinforced SiC porous ceramics via foam-gelcasting combined with catalytic nitridation. J Eur Ceram Soc. 2018;38:1210–1218. doi: 10.1016/j.jeurceramsoc.2017.10.043
15.
HanL, HuangL, DongL, Low temperature preparation of high-performance porous ceramics composed of anorthite platelets. J Am Ceram Soc. 2020;103:5365–5373. doi: 10.1111/jace.17265
16.
VereshaginVI, SokolovaSN.Granulated foam glass–ceramic material from zeolitic rocks. Constr Build Mater. 2008;22:999–1003. doi: 10.1016/j.conbuildmat.2007.01.016
17.
WuZ, SunL, PanJ, Fiber reinforced highly porous γ-Y2Si2O7 ceramic fabricated by foam-gelcasting-freeze drying method. Scripta Mater. 2018;146:331–334. doi: 10.1016/j.scriptamat.2017.12.017
18.
BenmansourN, AgoudjilB, GherabliA, Thermal and mechanical performance of natural mortar reinforced with date palm fibers for use as insulating materials in building. Energy Buildings. 2014;81:98–104. doi: 10.1016/j.enbuild.2014.05.032
19.
BerardiU, NaldiM.The impact of the temperature dependent thermal conductivity of insulating materials on the effective building envelope performance. Energy Buildings. 2017;144:262–275. doi: 10.1016/j.enbuild.2017.03.052
20.
KwokK, BoccacciniD, PerssonÅH, Homogenization of steady-state creep of porous metals using three-dimensional microstructural reconstructions. Int J Solids Struct. 2016;78:38–46. doi: 10.1016/j.ijsolstr.2015.09.020
21.
FischedickT, KindM, DietrichB.High temperature two-phase thermal conductivity of ceramic sponges with stagnant fluid-experimental results and correlation including thermal radiation. Int J Therm Sci. 2015;96:1–11. doi: 10.1016/j.ijthermalsci.2015.04.005
