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        Effect of characteristics of submicrometer powder on the sintering behaviors of Al2O3 ceramic

        Qingbo Tian,Jinshan Dai,Zhijie Lv,Tongguang Zhai 한양대학교 세라믹연구소 2016 Journal of Ceramic Processing Research Vol.17 No.7

        The sintering behaviors of high purity Al2O3 ceramics prepared from a submicron-scale powder were investigated. The effectsof ball milling on the evolution of alumina powders’ compressibility, sinterability, grain growth and microstructure duringsintering process were studied. It was observed that the relative density of the Al2O3 ceramics increased with increasingcompaction pressure on the green compacts and the sintering temperature. However, the applied pressure had less influenceon the relative density of ceramics sintered from green compact with narrower size distribution and finer powder. The fastgrain growth of the Al2O3 ceramics occurred in different temperature ranges and was influenced by milling time and formingmethods. The effect of milling on the microstructural evolution of alumina during sintering was also discussed.

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        Influences of characteristics of the alkaline activator on the compressive strength and microstructure of the fly ash-based geopolymer pastes

        Qingbo Tian,Daquan Sun,Zeyu Gu,Zhijie Lv 한양대학교 세라믹연구소 2020 Journal of Ceramic Processing Research Vol.21 No.3

        The effects of Na2O content, water to binder (W/B) ratio, and the modulus (Ms) of alkaline activator solution on a fly ash-basedgeopolymer paste (FGP) were investigated. The microstructure of the pastes was observed and characterised by Scanningelectron microscope and X-ray diffraction. The results showed that the increase of Na2O content and Ms resulted in an increasein compressive strength: an increase in the W/B ratios led to a decreased compressive strength. It was found that the highcompressive strength was achieved as Ms of the alkaline activator was 1.5, and the content of this activator was 8.0-12.0% bythe proportion of Na2O to fly ash. The compressive strength of these pastes was between 26.5-39.6 MPa at 28 days when theywere cured at 85 ºC for 1 h followed by curing under standard conditions. OH− concentration, determined by Na2O content,Ms, and water content, seemed to be a crucial parameter influencing the compressive strength. There was an optimal OH−concentration range, in which the appropriate strength of geopolymer paste would be achieved. An increased alkaline contentpromoted the reaction between the mineral phases of the fly ash with the alkaline activator and the formation of an additionalsodium aluminosilicate hydrate (N-A-S-H) gel.

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