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Effect of SiO_2/Na_2O mole ratio on the properties of foam geopolymers fabricated from circulating fluidized bed fly ash

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International Journal of Minerals,Metallurgy and Materials 2014年第6期21卷 620-626页

作者： Ze Liu Ning-ning Shao Tian-yong Huang Jun-feng Qin Dong-min Wang Yu Yang School of Chemical and Environmental Engineering China University of Mining and Technology

Geopolymers are three-dimensional aluminosilicates formed in a short time at low temperature by geopolymerization. In this pa-per, alkali-activated foam geopolymers were fabricated from circulating fluidized bed fly ash （CFA）, and the effect of SiO2/Na2O mole ratio （0.91-1.68） on their properties was studied. Geopolymerization products were characterized by mechanical testing, scanning electron mi-croscopy （SEM）, energy-dispersive X-ray spectroscopy （EDX）, and X-ray diffraction （XRD）. The results show that SiO2/Na2O mole ratio plays an important role in the mechanical and morphological characteristics of geopolymers. Foam samples prepared in 28 d with a SiO2/Na2O mole ratio of 1.42 exhibit the greatest compressive strength of 2.52 MPa. Morphological analysis reveals that these foam geo-polymers appear the relatively optimized pore structure and distribution, which are beneficial to the structure stability. Moreover, a combina-tion of the Si/Al atomic ratio ranging between 1.47 and 1.94 with the Na/Al atomic ratio of about 1 produces the samples with high strength.

关键词： foamed products geopolyrners fly ash strength of materials morphology silicon oxide sodium oxide

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Fabrication and properties of foam geopolymer using circulating fluidized bed combustion fly ash

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International Journal of Minerals,Metallurgy and Materials 2014年第1期21卷 89-94页

作者： Ze Liu Ning-ning Shao Dong-min Wang Jun-feng Qin Tian-yong Huang Wei Song Mu-xi Lin Jin-sha Yuan Zhen Wang School of Chemical and Environmental Engineering China University of Mining & Technology

In recent years, circulating fluidized bed combustion fly ash （CFA） is used as a raw material for geopolymer synthesis. Hydrogen peroxide was employed as a foaming agent to prepare CFA-based foam geopolymer. The particle distribution, mineral composition, and chemical composition of CFA were examined firstly. Geopolymerization products were characterized by mechanical testing, scanning elec- tron microscopy （SEM）, X-ray diffraction （XRD）, and X-ray fluorescence （XRF）. The CFA-based foam geopolymer was successfully fabri- cated with different contents of hydrogen peroxide and exhibited uncompleted alkali reaction and reasonable strength with relative low atomic ratios of Si/Al and Si/Na. Type-C CFA in this research could be recycled as an akernative source material for geopolymer production.

关键词： fly ash geopolymers foamed products microstructure hydrogen peroxide

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PREPARATION OF THE OPEN PORE ALUMINUM FOAMS USING INVESTMENT CASTING PROCESS

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Acta Metallurgica Sinica(English Letters) 2001年第1期14卷 27-32页

作者： L.C. Wang and F. Wang (Taiyuan Heavy Machinery Institute, Taiyuan 030024, China) Taiyuan Heavy Machinery Institute

This paper briefly presents characteristics, application and development of the metallic foams. Sound specimen has been achieved with prepared foam aluminum by using investment casting process. The preparation of plaster prefabricated mould is one key in investment casting. Main composition, ingredient and affecting factors of plaster mould are also discussed and the vacuum-infiltrated shaping technique is found to be another important link. The penetration model and the affecting mechanism of the main parameters are also analyzed. As a result, the optimum values are determined.

关键词： Aluminum alloys foamed products Foams Molds Plaster

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