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Preparation and characterization of ceramic materials with low thermal conductivity and high strength using high-calcium fly ash

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International Journal of Minerals,Metallurgy and Materials 2022年第8期29卷 1635-1645页

作者： Mana Rodchom panida wimuktiwan Kanit Soongprasit Duangduen Atong Supawan Vichaphund Ceramics and Construction Materials Research Group National Metal and Materials Technology Center(MTEC)National Science and Technology Development Agency(NSTDA)Khlong NuengKhlong LuangPathumthani 12120Thailand

High calcium-fly ash(HCFA)collected from the Mae Moh electricity generating plant in Thailand was utilized as a raw material for ceramic *** main compositions of HCFA characterized by X-ray fluorescence mainly consisted of 28.55wt%SiO_(2),16.06wt%Al_(2)O_(3),23.40wt%CaO,and 17.03wt%Fe_(2)O_(3).Due to high proportion of calcareous and ferruginous contents,HCFA was used for replacing the potash feldspar in amounts of 10wt%-40wt%.The influence of substituting high-calcium fly ash(0-40wt%)and sintering temperatures(1000-1200℃)on physical,mechanical,and thermal properties of ceramic-based materials was *** results showed that the in-corporation of HCFA in appropriate amounts could enhance the densification and the strength as well as reduce the thermal conductivity of ceramic *** proportion of calcareous and ferruginous constituents in fly ash promoted the vitrification behavior of ceramic *** a result,the densification was enhanced by liquid phase formation at optimum fly ash content and sintering *** addition,these components also facilitated a more abundant mullite formation and consequently improved flexural strength of the ceramic *** op-timum ceramic properties were achieved with adding fly ash content between 10wt%-30wt%sintered at 1150-1200℃.At 1200℃,the max-imum flexural strength of ceramic-FA samples with adding fly ash 10wt%-30wt%(PSW-FA(10)-(30))was obtained in the range of 92.25-94.71 MPa when the water absorption reached almost zero(0.03%).In terms of thermal insulation materials,the increase in fly ash addi-tion had a positively effect on the thermal conductivity,due to the higher levels of porosity created by gas evolving from the inorganic decom-position reactions inside the ceramic-FA *** addition of 20wt%-40wt%high-calcium fly ash in ceramic samples sintered at 1150℃reduced the thermal conductivity to 14.78%-49.25%,while maintaining acceptable flexural strength values(~45.67-87.62 MPa).

关键词： ceramic materials high-calcium fly ash strength thermal conductivity

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