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      저자 : Yoorim Rho (검색결과 2 건)
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        Characterization of metakaolin-based lightweight geopolymers with various foaming agents

        Yoorim Rho,SeungguKang 한양대학교 세라믹연구소 2020 Journal of Ceramic Processing Research Vol.21 No.S1

        In this study, lightweight foamed geopolymers based on metakaolin were synthesized and characterized. By considering thecompressive strength, density, and crystal phase of the specimens according to the type and amount of forming agent, thepossibility of replacing Al powder, a foaming agent, with Si sludge in lightweight foamed geopolymers was analyzed. Thespecimens foamed with Al powder had lower density than those with Si sludge. However, the compressive strength of theformer was higher than that of the specimens foamed with Si sludge, owing to a more uniform pore distribution andmicrostructure. Through this study, lightweight foamed geopolymers having density of 0.36~1.05 g/cm3 and compressivestrength of 0.7~4.7 MPa can be prepared by controlling the process conditions such as the amount of Si sludge added, alkaliactivator concentration, L/S ratio, etc. The possibility of Si sludge replacing Al powder as a foaming agent thus has beendemonstrated. The lightweight foamed geopolymer fabricated in this study can be applied to various fields as it can meet therequired physical properties according to the application.

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        Effect of TiO2 on the crystallization behaviors and microstructure of glazes based on MgO-Al2O3-SiO2 system

        Yoorim Rho,Kangduk Kim,Jin-Ho Kim 한양대학교 세라믹연구소 2020 Journal of Ceramic Processing Research Vol.21 No.S1

        A MgO-Al2O3-SiO2 system was used in order to prepare glass-ceramic glazes with high-hardness applicable to ceramic tiles. The glass-ceramic glazes were prepared by adding the fluxes CaO and B2O3 and the nucleating agent TiO2 to the glaze. The crystallization behavior of the glaze was calculated by a non-isothermal thermal analysis via a Differential Thermal Analysis (DTA), and the glaze was heat treated at the crystallization temperature (Tp2). The activation energy (E) and the Avrami constant (n) of the glaze with 8wt% TiO2 substitution were 177.07 kJ/mol and 2.65, respectively. X-ray diffraction analysis (XRD) showed that the cordierite and anorthite crystal phases were formed and the karrooite crystal phases grew with increasing TiO2 substitution. The degree of crystallinity increased as the amount of TiO2 increased and the degree of crystallinity was 76.5% in the glaze with 8 wt% TiO2 substitution. In the Scanning Electron Microscope (SEM) analysis, the cordierite and anorthite crystal phases were the largest in the glaze with 8wt% TiO2 substitution and rapidly decreased in the glaze with 12 wt% TiO2 substitution. As a result, Vickers hardness of the glaze showed a high value of 7.10 GPa at the glaze with 8wt% TiO2 substitution after heat treatment at 1,010 oC.

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