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RISS 인기검색어
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- 저자 : Jadambaa Temuujin (검색결과 2 건)
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Jadambaa Temuujin 한양대학교 세라믹연구소 2017 Journal of Ceramic Processing Research Vol.18 No.2
Influence of Cerium oxide (CeO2) addition in crystallization behavior and mechanical properties of glass ceramics in the Na2OCaO-Al2O3-SiO2system have been studied. Thermal behavior and hardness were studied by DTA-TG and indentationtechniques respectively. Glass ceramic precursors were prepared by fusing fly ash, window glass and fluorite either with(0.5 wt.%) or without cerium oxide at 1500 oC for 4 hrs followed by quenching in cold water. Crystallization of the amorphousprecursor occurred after 30 min at 800 oC forming plagioclase-type minerals. Hardness of the glass ceramics sintered at1000 oC was 5.66 GPa, while in the sample with cerium oxide was 7.45 GPa.
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Thermal analysis of geopolymer pastes synthesised from five fly ashes of variable composition
Rickard, William D.A.,Temuujin, Jadambaa,van Riessen, Arie Elsevier 2012 Journal of non-crystalline solids Vol.358 No.15
<P><B>Abstract</B></P><P>This paper presents a study on the thermal properties of a range of geopolymers in order to assess their suitability for high temperature applications such as thermal barriers, refractories and fire resistant structural members. Geopolymers were synthesised from five different fly ashes using sodium silicate and sodium aluminate solutions to achieve a set range of Si:Al compositional ratios. The thermo-physical, mechanical and microstructural properties of the geopolymers are presented and the effect of the source fly ash characteristics on the hardened product is discussed, as well as implications for high temperature applications. The amount and composition of the amorphous component (glass) of each of the fly ashes was determined by combining XRD and XRF results. It was found that the Si:Al ratio in the glass of the fly ashes strongly influenced the thermal performance of the geopolymers. Geopolymers synthesised from fly ashes with a high Si:Al (≥5) in the glass exhibited compressive strength gains and greater dimensional stability upon exposure to 1000°C, whereas geopolymers synthesised from fly ashes with low Si:Al (<2) in the glass exhibited strength losses and reduced dimensional stability upon high temperature exposure.</P> <P><B>Highlights</B></P><P>► Quantification of the crystalline and amorphous phases of five different fly ashes. ► Si:Al ratio in the glass of the fly ash influences the thermal performance. ► Compressive strength of geopolymers can increase by up to 5 fold after firing. ► Sodium aluminate activated geopolymers exhibit thermal stability up to 800°C. ► Sintering during thermal exposure improved inter-particle bonding.</P>
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